1
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Wang Z, Sheveleva AM, Li J, Zhou Z, Sapchenko S, Whitehead G, Warren MR, Collison D, Sun J, Schröder M, McInnes EJL, Yang S, Tuna F. Analysis of a Cu-Doped Metal-Organic Framework, MFM-520(Zn 1-x Cu x ), for NO 2 Adsorption. Adv Sci (Weinh) 2024; 11:e2305542. [PMID: 37964415 PMCID: PMC10767414 DOI: 10.1002/advs.202305542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 10/01/2023] [Indexed: 11/16/2023]
Abstract
MFM-520(Zn) confines dimers of NO2 with a high adsorption of 4.52 mmol g-1 at 1 bar at 298 K. The synthesis and the incommensurate structure of Cu-doped MFM-520(Zn) are reported. The introduction of paramagnetic Cu2+ sites allows investigation of the electronic and geometric structure of metal site by in situ electron paramagnetic resonance (EPR) spectroscopy upon adsorption of NO2 . By combining continuous wave and electron-nuclear double resonance spectroscopy, an unusual reverse Berry distorted coordination geometry of the Cu2+ centers is observed. Interestingly, Cu-doped MFM-520(Zn0.95 Cu0.05 ) shows enhanced adsorption of NO2 of 5.02 mmol g-1 at 1 bar at 298 K. Whereas MFM-520(Zn) confines adsorbed NO2 as N2 O4 , the presence of monomeric NO2 at low temperature suggests that doping with Cu2+ centers into the framework plays an important role in tuning the dimerization of NO2 molecules in the pore via the formation of specific host-guest interactions.
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Affiliation(s)
- Zi Wang
- Department of ChemistryUniversity of ManchesterManchesterM13 9PLUK
- Photon Science InstituteUniversity of ManchesterManchesterM13 9PLUK
| | - Alena M. Sheveleva
- Department of ChemistryUniversity of ManchesterManchesterM13 9PLUK
- Photon Science InstituteUniversity of ManchesterManchesterM13 9PLUK
| | - Jiangnan Li
- Department of ChemistryUniversity of ManchesterManchesterM13 9PLUK
| | - Zhengyang Zhou
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China
| | - Sergei Sapchenko
- Department of ChemistryUniversity of ManchesterManchesterM13 9PLUK
| | - George Whitehead
- Department of ChemistryUniversity of ManchesterManchesterM13 9PLUK
| | - Mark R. Warren
- Diamond Light SourceHarwell Science CampusOxfordshireOX11 0DEUK
| | - David Collison
- Department of ChemistryUniversity of ManchesterManchesterM13 9PLUK
- Photon Science InstituteUniversity of ManchesterManchesterM13 9PLUK
| | - Junliang Sun
- College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular SciencesPeking UniversityBeijing100871China
| | - Martin Schröder
- Department of ChemistryUniversity of ManchesterManchesterM13 9PLUK
| | - Eric J. L. McInnes
- Department of ChemistryUniversity of ManchesterManchesterM13 9PLUK
- Photon Science InstituteUniversity of ManchesterManchesterM13 9PLUK
| | - Sihai Yang
- Department of ChemistryUniversity of ManchesterManchesterM13 9PLUK
- College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular SciencesPeking UniversityBeijing100871China
| | - Floriana Tuna
- Department of ChemistryUniversity of ManchesterManchesterM13 9PLUK
- Photon Science InstituteUniversity of ManchesterManchesterM13 9PLUK
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2
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Alotaibi R, Booth A, Little E, Brookfield A, Achari A, Lockyer SJ, Timco GA, Whitehead GFS, Vitórica-Yrezábal IJ, Chilton NF, Nair RR, Collison D, Winpenny REP. Correction: Synthesis and characterization of heterometallic rings templated through alkylammonium or imidazolium cations. Dalton Trans 2023; 52:15131. [PMID: 37815825 PMCID: PMC10594598 DOI: 10.1039/d3dt90159a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 09/08/2023] [Indexed: 10/11/2023]
Abstract
Correction for 'Synthesis and characterization of heterometallic rings templated through alkylammonium or imidazolium cations' by Rajeh Alotaibi et al., Dalton Trans., 2023, 52, 7473-7481, https://doi.org/10.1039/D3DT00982C.
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Affiliation(s)
- Rajeh Alotaibi
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
- Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Amy Booth
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Edmund Little
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Adam Brookfield
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Amritroop Achari
- Department of Chemical Engineering and Analytical Science and National Graphene Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Selena J Lockyer
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Grigore A Timco
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - George F S Whitehead
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Iñigo J Vitórica-Yrezábal
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Nicholas F Chilton
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Rahul R Nair
- Department of Chemical Engineering and Analytical Science and National Graphene Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - David Collison
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Richard E P Winpenny
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
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3
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Bombana A, Shanmugam M, Collison D, Kibler AJ, Newton GN, Jäger CM, Croft AK, Morra S, Mitchell NJ. Application of a Synthetic Ferredoxin-Inspired [4Fe4S]-Peptide Maquette as the Redox Partner for an [FeFe]-Hydrogenase. Chembiochem 2023; 24:e202300250. [PMID: 37391388 PMCID: PMC10946529 DOI: 10.1002/cbic.202300250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 06/24/2023] [Accepted: 06/28/2023] [Indexed: 07/02/2023]
Abstract
'Bacterial-type' ferredoxins host a cubane [4Fe4S]2+/+ cluster that enables these proteins to mediate electron transfer and facilitate a broad range of biological processes. Peptide maquettes based on the conserved cluster-forming motif have previously been reported and used to model the ferredoxins. Herein we explore the integration of a [4Fe4S]-peptide maquette into a H2 -powered electron transport chain. While routinely formed under anaerobic conditions, we illustrate by electron paramagnetic resonance (EPR) analysis that these maquettes can be reconstituted under aerobic conditions by using photoactivated NADH to reduce the cluster at 240 K. Attempts to tune the redox properties of the iron-sulfur cluster by introducing an Fe-coordinating selenocysteine residue were also explored. To demonstrate the integration of these artificial metalloproteins into a semi-synthetic electron transport chain, we utilize a ferredoxin-inspired [4Fe4S]-peptide maquette as the redox partner in the hydrogenase-mediated oxidation of H2 .
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Affiliation(s)
- Andrea Bombana
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Muralidharan Shanmugam
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - David Collison
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Alexander J Kibler
- The GlaxoSmithKline Carbon Neutral Labs for Sustainable Chemistry, University of Nottingham Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, UK
| | - Graham N Newton
- The GlaxoSmithKline Carbon Neutral Labs for Sustainable Chemistry, University of Nottingham Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, UK
| | - Christof M Jäger
- Data Science and Modelling, Pharmaceutical Sciences, R&D, AstraZeneca Gothenburg, Pepparedsleden 1, 431 83, Mölndal, Sweden
- Department of Chemical and Environmental Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Anna K Croft
- Department of Chemical Engineering, School of AACME, Loughborough University, Loughborough, LE11 3TU, UK
| | - Simone Morra
- Department of Chemical and Environmental Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Nicholas J Mitchell
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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4
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Alotaibi R, Booth A, Little E, Brookfield A, Achari A, Lockyer SJ, Timco GA, Whitehead GFS, Vitórica-Yrezábal IJ, Chilton NF, Nair RR, Collison D, Winpenny REP. Synthesis and characterization of heterometallic rings templated through alkylammonium or imidazolium cations. Dalton Trans 2023; 52:7473-7481. [PMID: 37194350 PMCID: PMC10242454 DOI: 10.1039/d3dt00982c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 05/09/2023] [Indexed: 05/18/2023]
Abstract
We report the synthesis and structural characterization of a series of heterometallic rings templated via alkylammonium or imidazolium cations. The template and preference of each metal's coordination geometry can control the structure of heterometallic compounds, leading to octa-, nona-, deca-, dodeca-, and tetradeca-metallic rings. The compounds were characterized by single-crystal X-ray diffraction, elemental analysis, magnetometry, and EPR measurements. Magnetic measurements show that the exchange coupling between metal centres is antiferromagnetic. EPR spectroscopy shows that the spectra of {Cr7Zn} and {Cr9Zn} have S = 3/2 ground states, while the spectra of {Cr12Zn2} and {Cr8Zn} are consistent with S = 1 and 2 excited states. The EPR spectra of {(ImidH)-Cr6Zn2}, {(1-MeImH)-Cr8Zn2}, and {(1,2-diMeImH)-Cr8Zn2} include a combination of linkage isomers. The results on these related compounds allow us to examine the transferability of magnetic parameters between compounds.
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Affiliation(s)
- Rajeh Alotaibi
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Amy Booth
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Edmund Little
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Adam Brookfield
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Amritroop Achari
- Department of Chemical Engineering and Analytical Science and National Graphene Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Selena J Lockyer
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Grigore A Timco
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - George F S Whitehead
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Iñigo J Vitórica-Yrezábal
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Nicholas F Chilton
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Rahul R Nair
- Department of Chemical Engineering and Analytical Science and National Graphene Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - David Collison
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Richard E P Winpenny
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
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5
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Garvin M, Thompson WA, Tan JZY, Kampouri S, Ireland CP, Smit B, Brookfield A, Collison D, Negahdar L, Beale AM, Maroto-Valer MM, McIntosh RD, Garcia S. Highly selective CO 2 photoreduction to CO on MOF-derived TiO 2. RSC Sustain 2023; 1:494-503. [PMID: 37215582 PMCID: PMC10193832 DOI: 10.1039/d2su00082b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 02/07/2023] [Indexed: 05/24/2023]
Abstract
Metal-Organic Framework (MOF)-derived TiO2, synthesised through the calcination of MIL-125-NH2, is investigated for its potential as a CO2 photoreduction catalyst. The effect of the reaction parameters: irradiance, temperature and partial pressure of water was investigated. Using a two-level design of experiments, we were able to evaluate the influence of each parameter and their potential interactions on the reaction products, specifically the production of CO and CH4. It was found that, for the explored range, the only statistically significant parameter is temperature, with an increase in temperature being correlated to enhanced production of both CO and CH4. Over the range of experimental settings explored, the MOF-derived TiO2 displays high selectivity towards CO (98%), with only a small amount of CH4 (2%) being produced. This is notable when compared to other state-of-the-art TiO2 based CO2 photoreduction catalysts, which often showcase lower selectivity. The MOF-derived TiO2 was found to have a peak production rate of 8.9 × 10-4 μmol cm-2 h-1 (2.6 μmol g-1 h-1) and 2.6 × 10-5 μmol cm-2 h-1 (0.10 μmol g-1 h-1) for CO and CH4, respectively. A comparison is made to commercial TiO2, P25 (Degussa), which was shown to have a similar activity towards CO production, 3.4 × 10-3 μmol cm-2 h-1 (5.9 μmol g-1 h-1), but a lower selectivity preference for CO (3 : 1 CH4 : CO) than the MOF-derived TiO2 material developed here. This paper showcases the potential for MIL-125-NH2 derived TiO2 to be further developed as a highly selective CO2 photoreduction catalyst for CO production.
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Affiliation(s)
- Matthew Garvin
- Research Centre for Carbon Solutions, School of Engineering and Physical Sciences, Heriot-Watt University EH14 4AS UK
| | - Warren A Thompson
- Research Centre for Carbon Solutions, School of Engineering and Physical Sciences, Heriot-Watt University EH14 4AS UK
| | - Jeannie Z Y Tan
- Research Centre for Carbon Solutions, School of Engineering and Physical Sciences, Heriot-Watt University EH14 4AS UK
| | - Stavroula Kampouri
- Laboratory of molecular simulation (LSMO), Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL) Rue de l'Industrie 17 CH-1951 Sion Switzerland
| | - Christopher P Ireland
- Laboratory of molecular simulation (LSMO), Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL) Rue de l'Industrie 17 CH-1951 Sion Switzerland
| | - Berend Smit
- Laboratory of molecular simulation (LSMO), Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL) Rue de l'Industrie 17 CH-1951 Sion Switzerland
| | - Adam Brookfield
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9Pl UK
| | - David Collison
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9Pl UK
| | - Leila Negahdar
- Department of Chemistry, University College London 20 Gordon Street London WC1H 0AJ UK
- Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory Harwell Oxfordshire OX11 0FA UK
| | - Andrew M Beale
- Department of Chemistry, University College London 20 Gordon Street London WC1H 0AJ UK
- Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory Harwell Oxfordshire OX11 0FA UK
| | - M Mercedes Maroto-Valer
- Research Centre for Carbon Solutions, School of Engineering and Physical Sciences, Heriot-Watt University EH14 4AS UK
| | - Ruaraidh D McIntosh
- Institute of Chemical Sciences, School of Engineering and Physical Sciences, Heriot-Watt University EH14 4AS UK
| | - Susana Garcia
- Research Centre for Carbon Solutions, School of Engineering and Physical Sciences, Heriot-Watt University EH14 4AS UK
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6
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Cortezon-Tamarit F, Song K, Kuganathan N, Arrowsmith RL, Mota Merelo de Aguiar SR, Waghorn PA, Brookfield A, Shanmugam M, Collison D, Ge H, Kociok-Köhn G, Pourzand C, Dilworth JR, Pascu SI. Structural and Functional Diversity in Rigid Thiosemicarbazones with Extended Aromatic Frameworks: Microwave-Assisted Synthesis and Structural Investigations. ACS Omega 2023; 8:16047-16079. [PMID: 37179648 PMCID: PMC10173449 DOI: 10.1021/acsomega.2c08157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 03/10/2023] [Indexed: 05/15/2023]
Abstract
The long-standing interest in thiosemicarbazones (TSCs) has been largely driven by their potential toward theranostic applications including cellular imaging assays and multimodality imaging. We focus herein on the results of our new investigations into: (a) the structural chemistry of a family of rigid mono(thiosemicarbazone) ligands characterized by extended and aromatic backbones and (b) the formation of their corresponding thiosemicarbazonato Zn(II) and Cu(II) metal complexes. The synthesis of new ligands and their Zn(II) complexes was performed using a rapid, efficient and straightforward microwave-assisted method which superseded their preparation by conventional heating. We describe hereby new microwave irradiation protocols that are suitable for both imine bond formation reactions in the thiosemicabazone ligand synthesis and for Zn(II) metalation reactions. The new thiosemicarbazone ligands, denoted HL, mono(4-R-3-thiosemicarbazone)quinone, and their corresponding Zn(II) complexes, denoted ZnL2, mono(4-R-3-thiosemicarbazone)quinone, where R = H, Me, Ethyl, Allyl, and Phenyl, quinone = acenapthnenequinone (AN), aceanthrenequinone (AA), phenanthrenequinone (PH), and pyrene-4,5-dione (PY) were isolated and fully characterized spectroscopically and by mass spectrometry. A plethora of single crystal X-ray diffraction structures were obtained and analyzed and the geometries were also validated by DFT calculations. The Zn(II) complexes presented either distorted octahedral geometry or tetrahedral arrangements of the O/N/S donors around the metal center. The modification of the thiosemicarbazide moiety at the exocyclic N atoms with a range of organic linkers was also explored, opening the way to bioconjugation protocols for these compounds. The radiolabeling of these thiosemicarbazones with 64Cu was achieved under mild conditions for the first time: this cyclotron-available radioisotope of copper (t1/2 = 12.7 h; β+ 17.8%; β- 38.4%) is well-known for its proficiency in positron emission tomography (PET) imaging and for its theranostic potential, on the basis of the preclinical and clinical cancer research of established bis(thiosemicarbazones), such as the hypoxia tracer 64Cu-labeled copper(diacetyl-bis(N4-methylthiosemicarbazone)], [64Cu]Cu(ATSM). Our labeling reactions proceeded in high radiochemical incorporation (>80% for the most sterically unencumbered ligands) showing promise of these species as building blocks for theranostics and synthetic scaffolds for multimodality imaging probes. The corresponding "cold" Cu(II) metalations were also performed under the mild conditions mimicking the radiolabeling protocols. Interestingly, room temperature or mild heating led to Cu(II) incorporation in the 1:1, as well as 1:2 metal: ligand ratios in the new complexes, as evident from extensive mass spectrometry investigations backed by EPR measurements, and the formation of Cu(L)2-type species prevails, especially for the AN-Ph thiosemicarbazone ligand (L-). The cytotoxicity levels of a selection of ligands and Zn(II) complexes in this class were further tested in commonly used human cancer cell lines (HeLa, human cervical cancer cells, and PC-3, human prostate cancer cells). Tests showed that their IC50 levels are comparable to that of the clinical drug cis-platin, evaluated under similar conditions. The cellular internalizations of the selected ZnL2-type compounds Zn(AN-Allyl)2, Zn(AA-Allyl)2, Zn(PH-Allyl)2, and Zn(PY-Allyl)2 were evaluated in living PC-3 cells using laser confocal fluorescent spectroscopy and these experiments showed exclusively cytoplasmic distributions.
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Affiliation(s)
| | - Kexin Song
- Department
of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, United
Kingdom
| | - Navaratnarajah Kuganathan
- Department
of Materials, Imperial College London, Royal School of Mines, Exhibition
Road, London SW7 2AZ, U.K.
| | - Rory L. Arrowsmith
- Department
of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, United
Kingdom
| | | | - Philip A. Waghorn
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, United Kingdom
| | - Adam Brookfield
- Department
of Chemistry, and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Muralidharan Shanmugam
- Department
of Chemistry, and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - David Collison
- Department
of Chemistry, and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Haobo Ge
- Department
of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, United
Kingdom
- Department
of Life Sciences, University of Bath, Bath BA2 7AY, U.K.
| | - Gabriele Kociok-Köhn
- Department
of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, United
Kingdom
| | - Charareh Pourzand
- Department
of Life Sciences, University of Bath, Bath BA2 7AY, U.K.
- Centre of
Therapeutic Innovation, University of Bath, Bath BA2 7AY, U.K.
| | - Jonathan Robin Dilworth
- Department
of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, United
Kingdom
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, United Kingdom
| | - Sofia Ioana Pascu
- Department
of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, United
Kingdom
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, United Kingdom
- Centre of
Therapeutic Innovation, University of Bath, Bath BA2 7AY, U.K.
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7
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Alderhami SA, Ahumada-Lazo R, Buckingham MA, Binks DJ, O'Brien P, Collison D, Lewis DJ. Synthesis and characterisation of Ga- and In-doped CdS by solventless thermolysis of single source precursors. Dalton Trans 2023; 52:3072-3084. [PMID: 36779844 DOI: 10.1039/d3dt00239j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We report a facile and low temperature synthesis of Ga- and In-doped CdS nanoparticles from molecular precursors. Diethyldithiocarbamate complexes of Cd(II), Ga(III), and In(III), were synthesised and decomposed in tandem through solventless thermolysis, producing Ga- or In-doped CdS. The resultant MxCd1-xS1+0.5x (where M = Ga/In at x values of 0, 0.02, 0.04, 0.06, 0.08 and 0.1) particulate powder was analysed by powder X-ray diffraction, which showed that both Ga (through all doping levels) and In (at doping levels <8 mol%) were successfully incorporated into the hexagonal CdS lattice without any impurities. Raman spectroscopy also showed no significant change from CdS. Scanning electron microscopy and energy dispersive X-ray spectroscopy were used to investigate the morphology and elemental dispersion through the doped CdS materials, showing homogenous incorporation of dopant. The optical and luminescent properties of the doped MxCd1-xS1+0.5x materials were examined by UV-Vis absorption and photoluminescence spectroscopies respectively. All materials were found to exhibit excitonic emission, corresponding to band gap energies between 2.7 and 2.9 eV and surface defect induced emission which is more prominent for Ga than for In doping. Additionally, moderate doping slows down charge carrier recombination by increasing the lifetimes of excitonic and surface state emissions, but particularly for the latter process.
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Affiliation(s)
- Suliman A Alderhami
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.,Department of Chemistry, Faculty of Science and Arts, Al-Baha University, Al Makhwah, Saudi Arabia
| | - Ruben Ahumada-Lazo
- Department of Physics and Astronomy and the Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.,Tecnologico de Monterrey, School of Engineering and Sciences, Ave. Eugenio Garza Sada 2501, Monterrey, N.L., Mexico, 64849
| | - Mark A Buckingham
- Department of Materials, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
| | - David J Binks
- Department of Physics and Astronomy and the Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Paul O'Brien
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.,Department of Materials, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
| | - David Collison
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - David J Lewis
- Department of Materials, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
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8
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Alotaibi R, Brookfield A, Fowler JM, Whitehead GFS, Lockyer SJ, Timco GA, Collison D, Schnack J, Winpenny REP. Templating metallocycles with a macrocycle: synthesis, structures and magnetic studies of {Cr 11M 2} complexes. Dalton Trans 2022; 52:20-23. [PMID: 36477464 PMCID: PMC9764323 DOI: 10.1039/d2dt03368b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Addition of 1,4,8,11-tetrazacyclotetradecane (cyclam) to a reaction that produces octametallic rings when simpler amines are used, produces {Cr11M2} "pretzels" (M = ZnII or CuII) where the cyclam coordinates to the MII ion which then sits at the centre of a twelve-metal macrocycle. Magnetic studies were fitted using the finite-temperature Lanczos method (FTLM), and the results demonstrate that exchange interactions are transferable from previous exchange-coupled CrIII rings.
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Affiliation(s)
- Rajeh Alotaibi
- Department of Chemistry, The University of ManchesterOxford RoadManchesterM13 9PLUK,Department of Chemistry, King Saud UniversityRiyadh 11451Saudi Arabia
| | - Adam Brookfield
- Department of Chemistry, The University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Jonathan M. Fowler
- Department of Chemistry, The University of ManchesterOxford RoadManchesterM13 9PLUK
| | | | - Selena J. Lockyer
- Department of Chemistry, The University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Grigore A. Timco
- Department of Chemistry, The University of ManchesterOxford RoadManchesterM13 9PLUK
| | - David Collison
- Department of Chemistry, The University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Jürgen Schnack
- Faculty of Physics, P.O. Box 100131, Bielefeld UniversityD-33501 BielefeldGermany
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9
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Rogers C, Hardwick O, Corry TA, Rummel F, Collison D, Bowen AM, O’Malley PJ. Magnetic and Electronic Structural Properties of the S 3 State of Nature's Water Oxidizing Complex: A Combined Study in ELDOR-Detected Nuclear Magnetic Resonance Spectral Simulation and Broken-Symmetry Density Functional Theory. ACS Omega 2022; 7:41783-41788. [PMID: 36406523 PMCID: PMC9670293 DOI: 10.1021/acsomega.2c06151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 10/24/2022] [Indexed: 06/16/2023]
Abstract
ELDOR-detected nuclear magnetic resonance (EDNMR) spectral simulations combined with broken-symmetry density functional theory (BS-DFT) calculations are used to obtain and to assign the 55Mn hyperfine coupling constants (hfcs) for modified forms of the water oxidizing complex in the penultimate S3 state of the water oxidation cycle. The study shows that an open cubane form of the core Mn4CaO6 cluster explains the magnetic properties of the dominant S = 3 species in all cases studied experimentally with no need to invoke a closed cubane intermediate possessing a distorted pentacoordinate Mn4 ion as recently suggested. EDNMR simulations found that both the experimental bandwidth and multinuclear transitions may alter relative EDNMR peak intensities, potentially leading to incorrect assignment of hfcs. The implications of these findings for the water oxidation mechanism are discussed.
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10
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Rogers CJ, Asthana D, Brookfield A, Chiesa A, Timco GA, Collison D, Natrajan LS, Carretta S, Winpenny REP, Bowen AM. Modelling Conformational Flexibility in a Spectrally Addressable Molecular Multi‐Qubit Model System. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202207947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ciarán J. Rogers
- National Research Facility for Electron Paramagnetic Resonance Spectroscopy Department of Chemistry and Photon Science Institute The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Deepak Asthana
- National Research Facility for Electron Paramagnetic Resonance Spectroscopy Department of Chemistry and Photon Science Institute The University of Manchester Oxford Road Manchester M13 9PL UK
- Department of Chemistry Ashoka University Sonipat Haryana India
| | - Adam Brookfield
- National Research Facility for Electron Paramagnetic Resonance Spectroscopy Department of Chemistry and Photon Science Institute The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Alessandro Chiesa
- Dipartimento di Scienze Matematiche Fisiche e Informatiche Università di Parma 43124 Parma Italy
- INFN–Sezione di Milano-Bicocca Gruppo Collegato di Parma I-43124 Parma Italy
- UdR Parma INSTM I-43124 Parma Italy
| | - Grigore A. Timco
- National Research Facility for Electron Paramagnetic Resonance Spectroscopy Department of Chemistry and Photon Science Institute The University of Manchester Oxford Road Manchester M13 9PL UK
| | - David Collison
- National Research Facility for Electron Paramagnetic Resonance Spectroscopy Department of Chemistry and Photon Science Institute The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Louise S. Natrajan
- National Research Facility for Electron Paramagnetic Resonance Spectroscopy Department of Chemistry and Photon Science Institute The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Stefano Carretta
- Dipartimento di Scienze Matematiche Fisiche e Informatiche Università di Parma 43124 Parma Italy
- INFN–Sezione di Milano-Bicocca Gruppo Collegato di Parma I-43124 Parma Italy
- UdR Parma INSTM I-43124 Parma Italy
| | - Richard E. P. Winpenny
- National Research Facility for Electron Paramagnetic Resonance Spectroscopy Department of Chemistry and Photon Science Institute The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Alice M. Bowen
- National Research Facility for Electron Paramagnetic Resonance Spectroscopy Department of Chemistry and Photon Science Institute The University of Manchester Oxford Road Manchester M13 9PL UK
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11
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Rogers CJ, Asthana D, Brookfield A, Chiesa A, Timco GA, Collison D, Natrajan LS, Carretta S, Winpenny REP, Bowen AM. Modelling Conformational Flexibility in a Spectrally Addressable Molecular Multi-Qubit Model System. Angew Chem Int Ed Engl 2022; 61:e202207947. [PMID: 36222278 PMCID: PMC9828767 DOI: 10.1002/anie.202207947] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Indexed: 11/11/2022]
Abstract
Dipolar coupled multi-spin systems have the potential to be used as molecular qubits. Herein we report the synthesis of a molecular multi-qubit model system with three individually addressable, weakly interacting, spin 1 / 2 ${{ 1/2 }}$ centres of differing g-values. We use pulsed Electron Paramagnetic Resonance (EPR) techniques to characterise and separately address the individual electron spin qubits; CuII , Cr7 Ni ring and a nitroxide, to determine the strength of the inter-qubit dipolar interaction. Orientation selective Relaxation-Induced Dipolar Modulation Enhancement (os-RIDME) detecting across the CuII spectrum revealed a strongly correlated CuII -Cr7 Ni ring relationship; detecting on the nitroxide resonance measured both the nitroxide and CuII or nitroxide and Cr7 Ni ring correlations, with switchability of the interaction based on differing relaxation dynamics, indicating a handle for implementing EPR-based quantum information processing (QIP) algorithms.
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Affiliation(s)
- Ciarán J. Rogers
- National Research Facility for Electron Paramagnetic Resonance SpectroscopyDepartment of Chemistry and Photon Science InstituteThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Deepak Asthana
- National Research Facility for Electron Paramagnetic Resonance SpectroscopyDepartment of Chemistry and Photon Science InstituteThe University of ManchesterOxford RoadManchesterM13 9PLUK,Department of ChemistryAshoka UniversitySonipatHaryanaIndia
| | - Adam Brookfield
- National Research Facility for Electron Paramagnetic Resonance SpectroscopyDepartment of Chemistry and Photon Science InstituteThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Alessandro Chiesa
- Dipartimento di Scienze Matematiche Fisiche e InformaticheUniversità di Parma43124ParmaItaly,INFN–Sezione di Milano-BicoccaGruppo Collegato di ParmaI-43124ParmaItaly,UdR ParmaINSTMI-43124ParmaItaly
| | - Grigore A. Timco
- National Research Facility for Electron Paramagnetic Resonance SpectroscopyDepartment of Chemistry and Photon Science InstituteThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - David Collison
- National Research Facility for Electron Paramagnetic Resonance SpectroscopyDepartment of Chemistry and Photon Science InstituteThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Louise S. Natrajan
- National Research Facility for Electron Paramagnetic Resonance SpectroscopyDepartment of Chemistry and Photon Science InstituteThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Stefano Carretta
- Dipartimento di Scienze Matematiche Fisiche e InformaticheUniversità di Parma43124ParmaItaly,INFN–Sezione di Milano-BicoccaGruppo Collegato di ParmaI-43124ParmaItaly,UdR ParmaINSTMI-43124ParmaItaly
| | - Richard E. P. Winpenny
- National Research Facility for Electron Paramagnetic Resonance SpectroscopyDepartment of Chemistry and Photon Science InstituteThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Alice M. Bowen
- National Research Facility for Electron Paramagnetic Resonance SpectroscopyDepartment of Chemistry and Photon Science InstituteThe University of ManchesterOxford RoadManchesterM13 9PLUK
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12
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Munhoz D, Collet C, Collison D, Mizukami T, McCartney P, Sonck J, Ford T, Berry C, De Bruyne B, Oldroyd K. Improvement in angina pectoris after percutaneous coronary interventions in focal and diffuse coronary artery disease. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.2016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Objective
To investigate the effect of PCI on patient-reported outcomes in focal and diffuse coronary artery disease (CAD) as defined by the pullback pressure gradient (PPG).
Background
Improvements in fractional flow reserve (FFR) following PCI are associated with freedom from angina. CAD patterns influence the FFR change after stenting. Therefore, CAD patterns might be essential to assess the likelihood of PCI success in terms of angina relief.
Methods
This is a sub-analysis of the TARGET-FFR randomized clinical trial (NCT03259815). The 7-item Seattle Angina Questionnaire (SAQ-7) and EuroQol five-level EQ-5D questionnaire (EQ-5D-5L) were administered at baseline and three months after PCI. The PPG index was calculated from manual pre-PCI FFR pullbacks and the median PPG value was used to define focal and diffuse CAD.
Results
103 patients (51 with focal and 52 with diffuse disease) were analyzed. There were no differences in baseline characteristics between patients with focal and diffuse CAD. Patients with focal disease had larger increases in FFR with PCI than those with diffuse disease (0.30±0.14 units vs 0.19±0.12 units, p<0.001). Patients who underwent PCI to focal CAD had significantly higher SAQ-7 summary scores at follow-up compared to those with diffuse CAD (87.1±20.3 vs. 75.6±24.4, mean difference 11.5 [95% CI 2.8 to 20.3], p=0.01). Following PCI, residual angina was present in 39.8% of all patients but was significantly lower among those with treated focal CAD (27.5% vs 51.9%, p-value=0.020).
Conclusion
Persistent angina after PCI was almost twice as common in patients with diffuse CAD as defined by the pre-PCI PPG. Patients with focal disease reported greater improvement in angina and quality of life with PCI. The likelihood of successful angina relief from PCI can be predicted by the baseline pattern of CAD.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- D Munhoz
- Olv Hospital Aalst , Aalst , Belgium
| | - C Collet
- Olv Hospital Aalst , Aalst , Belgium
| | - D Collison
- Golden Jubilee National Hospital, West of Scotland Regional Heart & Lung Centre , Clydebank , United Kingdom
| | - T Mizukami
- Showa University Hospital, Department of Clinical Pharmacology , Tokyo , Japan
| | - P McCartney
- University of Glasgow, Institute of Cardiovascular & Medical Sciences , Glasgow , United Kingdom
| | - J Sonck
- Olv Hospital Aalst , Aalst , Belgium
| | - T Ford
- Golden Jubilee National Hospital, West of Scotland Regional Heart & Lung Centre , Clydebank , United Kingdom
| | - C Berry
- University of Glasgow, Institute of Cardiovascular & Medical Sciences , Glasgow , United Kingdom
| | - B De Bruyne
- Lausanne University Hospital, Department of Cardiology , Lausanne , Switzerland
| | - K Oldroyd
- University of Glasgow, Institute of Cardiovascular & Medical Sciences , Glasgow , United Kingdom
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13
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Mikhail P, Howden N, Monjur M, Said C, Jeyaprakash P, Bland A, Collison D, McCartney P, Adamson C, Morrow A, Carrick D, McEntegart M, Ford T. Coronary perforation incidence and temporal trends (COPIT): systematic review and meta-analysis. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.2064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Despite advancements in Percutaneous Coronary Intervention (PCI) technology and techniques, iatrogenic coronary artery perforation (CAP) remains a dreaded potential complication within the cardiac catheterisation laboratory. Data detailing the incidence of coronary perforation during PCI has previously been obtained from relatively small datasets. A swell of large data published in recent times provides invaluable information regarding PCI related CAP.
Purpose
COPIT is a systematic review and meta-analysis targeted at detailing the incidence, outcomes, etiology and treatment modalities of PCI related CAP including evaluation of temporal trends since the inception of PCI to contemporary practice. Additionally, COPIT provides hypothesis generating data regarding predictors of CAP during PCI.
Methods
A prospective systematic review and meta-analysis using MEDLINE and EMBASE via the OVID interface (PROSPERO ID: CRD42020207881) was performed according to the PRISMA guidelines. Identified relevant studies were used in a pre-specified sensitivity analysis to detail incidence, outcomes, etiology, treatment modalities and risk factors of PCI complicated by CAP. Studies limited to PCI in high risk populations only such as CTO-PCI or rotational atherectomy only were excluded.
Results
67 studies met eligibility criteria detailing 5,568,191 PCIs over a 38-year period (1982–2020). The pooled incidence of CAP was 0.39% (95% CI: 0.34–0.45%) with no change in incidence over that time. Approximately 1 in 5 perforations led to cardiac tamponade (21.1%). Ellis 3 perforations are increasing in frequency and account for 43% of all perforations. Mortality due to perforation occurs in 7.5% of all CAP (95% CI 6.7% - 8.4%) but has declined over the studied period. Meta-regression suggested that female gender, hypertension, chronic kidney disease and previous coronary bypass grafting were all associated with higher incidence of CAP. Coronary perforation was most frequently caused by distal wire exit (37%) followed by balloon dilation catheters (28%). Covered stents were used to treat 25% of perforations, with emergency cardiac surgery needed in 17%.
Conclusion
Coronary perforations occurs in approximately 1 in 250 all-comer PCI procedures. A tendency towards increase in coronary perforations is likely reflective of contemporary trends towards high pressure post-dilatation with 1:1 vessel sizing as well as an ageing population with increasingly complex, calcific coronary disease. However, reduction in CAP related mortality suggests earlier recognition and effective treatment with transcatheter techniques.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- P Mikhail
- Gosford Hospital , Gosford , Australia
| | - N Howden
- Gosford Hospital , Gosford , Australia
| | - M Monjur
- St George Hospital , Sydney , Australia
| | - C Said
- Gosford Hospital , Gosford , Australia
| | | | - A Bland
- Gosford Hospital , Gosford , Australia
| | - D Collison
- Golden Jubilee National Hospital , Glasgow , United Kingdom
| | - P McCartney
- University of Glasgow , Glasgow , United Kingdom
| | - C Adamson
- University of Glasgow , Glasgow , United Kingdom
| | - A Morrow
- University of Glasgow , Glasgow , United Kingdom
| | - D Carrick
- Hairmyres Hospital , East Kilbride , United Kingdom
| | - M McEntegart
- Columbia University , New York , United States of America
| | - T Ford
- Gosford Hospital , Gosford , Australia
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14
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Asthana D, Thomas D, Lockyer SJ, Brookfield A, Timco GA, Vitorica-Yrezabal IJ, Whitehead GFS, McInnes EJL, Collison D, Leigh DA, Winpenny REP. Decorating polymer beads with 10 14 inorganic-organic [2]rotaxanes as shown by spin counting. Commun Chem 2022; 5:73. [PMID: 36697699 PMCID: PMC9814693 DOI: 10.1038/s42004-022-00689-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 05/27/2022] [Indexed: 01/28/2023] Open
Abstract
Polymer beads have been used as the core of magnetic particles for around twenty years. Here we report studies to attach polymetallic complexes to polymer beads for the first time, producing beads of around 115 microns diameter that are attached to 1014 hybrid inorganic-organic [2]rotaxanes. The bead is then formally a [1014] rotaxane. The number of complexes attached is counted by EPR spectroscopy after including TEMPO radicals within the thread of the hybrid [2]rotaxanes.
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Affiliation(s)
- Deepak Asthana
- grid.5379.80000000121662407Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9Pl UK ,grid.449178.70000 0004 5894 7096Department of Chemistry, Ashoka University, Sonipat, Haryana India
| | - Dean Thomas
- grid.5379.80000000121662407Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9Pl UK
| | - Selena J. Lockyer
- grid.5379.80000000121662407Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9Pl UK
| | - Adam Brookfield
- grid.5379.80000000121662407Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9Pl UK
| | - Grigore A. Timco
- grid.5379.80000000121662407Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9Pl UK
| | - Iñigo J. Vitorica-Yrezabal
- grid.5379.80000000121662407Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9Pl UK
| | - George F. S. Whitehead
- grid.5379.80000000121662407Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9Pl UK
| | - Eric J. L. McInnes
- grid.5379.80000000121662407Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9Pl UK
| | - David Collison
- grid.5379.80000000121662407Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9Pl UK
| | - David A. Leigh
- grid.5379.80000000121662407Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9Pl UK
| | - Richard E. P. Winpenny
- grid.5379.80000000121662407Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9Pl UK
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15
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Monaghan OR, Skowron ST, Moore JC, Pin-Nó M, Kortsen K, Atkinson RL, Krumins E, Lentz JC, Machado F, Onat Z, Brookfield A, Collison D, Khlobystov AN, De Focatiis D, Irvine DJ, Taresco V, Stockman RA, Howdle SM. A self-crosslinking monomer, α-pinene methacrylate: understanding and exploiting hydrogen abstraction. Polym Chem 2022. [DOI: 10.1039/d2py00878e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A combined computational/experimental approach has been applied to investigate the self-crosslinking of α-pinene methacrylate via chain transfer through hydrogen abstraction.
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Affiliation(s)
- Olivia R. Monaghan
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Stephen T. Skowron
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Jonathan C. Moore
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - María Pin-Nó
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Kristoffer Kortsen
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Rachel L. Atkinson
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Eduards Krumins
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Joachim C. Lentz
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Fabricio Machado
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
- Institute of Chemistry, University of Brasília, Campus Universitário Darcy Ribeiro, 70910-900, Brasília, DF, Brazil
| | - Zeynep Onat
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Adam Brookfield
- Department of Chemistry, The University of Manchester, Manchester M13 9PL, UK
| | - David Collison
- Department of Chemistry, The University of Manchester, Manchester M13 9PL, UK
| | - Andrei N. Khlobystov
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Davide De Focatiis
- Faculty of Engineering, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Derek J. Irvine
- Faculty of Engineering, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Vincenzo Taresco
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Robert A. Stockman
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Steven M. Howdle
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
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16
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Alanazi A, McNaughter PD, Alam F, Vitorica-yrezabal IJ, Whitehead GFS, Tuna F, O’Brien P, Collison D, Lewis DJ. Structural Investigations of α-MnS Nanocrystals and Thin Films Synthesized from Manganese(II) Xanthates by Hot Injection, Solvent-Less Thermolysis, and Doctor Blade Routes. ACS Omega 2021; 6:27716-27725. [PMID: 34722972 PMCID: PMC8552351 DOI: 10.1021/acsomega.1c02907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 08/17/2021] [Indexed: 06/13/2023]
Abstract
Manganese(II) xanthate complexes of the form [Mn(S2COR)2(TMEDA)], where TMEDA = tetramethylethylenediamine and R = methyl (1), ethyl (2), n-propyl (3), n-butyl (4), n-pentyl (5), n-hexyl (6), and n-octyl (7), have been synthesized and structures elucidated using single-crystal X-ray diffraction. Complexes 1-7 were used as molecular precursors to synthesize manganese sulfide (MnS). Olelyamine-capped nanocrystals have been produced via hot injection, while the doctor blading followed by thermolysis yielded thick films. Free-standing polycrystalline powders of MnS are produced by direct thermolysis of precursor powders. All thermolysis techniques produced cubic MnS, as confirmed by powder X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Raman spectroscopy. Magnetic measurements reveal that the α-MnS nanocrystals exhibit ferromagnetic behavior with a large coercive field strength (e.g., 0.723 kOe for 6.8 nm nanocrystals).
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Affiliation(s)
- Abdulaziz
M. Alanazi
- Department
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Paul D. McNaughter
- Department
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Firoz Alam
- Department
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | | | - George F. S. Whitehead
- Department
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Floriana Tuna
- Department
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Paul O’Brien
- Department
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
- Department
of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - David Collison
- Department
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - David J. Lewis
- Department
of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
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17
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Alotaibi R, Little E, Fowler JM, Brookfield A, Adams RW, Achari A, Timco GA, Whitehead GFS, Chilton NF, Nair RR, Collison D, Winpenny REP. Single Isomer Heterometallic {Cr III6M II2} Rings Templated by Tetramethylammonium. Inorg Chem 2021; 60:15675-15685. [PMID: 34613713 DOI: 10.1021/acs.inorgchem.1c02342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A family of heterometallic rings [Me4N]2[CrIII6MII2F8(O2CtBu)16] is reported using tetramethylammonium hydroxide pentahydrate as the source of a template, where M = Zn, Mn, Ni, and Co. The metal cores are octagons with metal-metal edges bridged by one fluoride and two carboxylate ligands. The divalent metal ions are found ordered at positions 1 and 5 in the octagon. The tetramethylammonium cations are above and below the metal plane of the ring in the crystal structure. Magnetic studies show antiferromagnetic coupling between the paramagnetic metal ions present, leading to paramagnetic ground states in each case. 1H NMR spectroscopy confirms that the structure of the {CrIII6CoII2} ring exists in solution, and electron paramagnetic resonance spectroscopy confirms the magnetic structure of the other three rings.
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Affiliation(s)
- Rajeh Alotaibi
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Edmund Little
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Jonathan M Fowler
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Adam Brookfield
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Ralph W Adams
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Amritroop Achari
- Department of Physics and Astronomy and National Graphene Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Grigore A Timco
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - George F S Whitehead
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Nicholas F Chilton
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Rahul R Nair
- Department of Physics and Astronomy and National Graphene Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - David Collison
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Richard E P Winpenny
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
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18
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Doheny PW, Hua C, Chan B, Tuna F, Collison D, Kepert CJ, D'Alessandro DM. Substituent effects on through-space intervalence charge transfer in cofacial metal-organic frameworks. Faraday Discuss 2021; 231:152-167. [PMID: 34251000 DOI: 10.1039/d1fd00021g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electroactive metal-organic frameworks (MOFs) are an attractive class of materials owing to their multifunctional 3-dimensional structures, the properties of which can be modulated by changing the redox states of the components. In order to realise both fundamental and applied goals for these materials, a deeper understanding of the structure-function relationships that govern the charge transfer mechanisms is required. Chemical or electrochemical reduction of the framework [Zn(BPPFTzTz)(tdc)]·2DMF, hereafter denoted ZnFTzTz (where BPPFTzTz = 2,5-bis(3-fluoro-4-(pyridin-4-yl)phenyl)thiazolo[5,4-d]thiazole), generates mixed-valence states with optical signatures indicative of through-space intervalence charge transfer (IVCT) between the cofacially stacked ligands. Fluorination of the TzTz ligands influences the IVCT band parameters relative to the unsubstituted parent system, as revealed through Marcus-Hush theory analysis and single crystal UV-Vis spectroscopy. Using a combined experimental, theoretical and density functional theory (DFT) analysis, important insights into the effects of structural modifications, such as ligand substitution, on the degree of electronic coupling and rate of electron transfer have been obtained.
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Affiliation(s)
- Patrick W Doheny
- School of Chemistry, The University of Sydney, New South Wales, 2006 Australia.
| | - Carol Hua
- School of Chemistry, The University of Sydney, New South Wales, 2006 Australia. .,School of Chemistry, The University of Melbourne, Victoria, 3010 Australia
| | - Bun Chan
- Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan
| | - Floriana Tuna
- Department of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, UK
| | - David Collison
- Department of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, UK
| | - Cameron J Kepert
- School of Chemistry, The University of Sydney, New South Wales, 2006 Australia.
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19
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Bakly AAK, Collison D, Ahumada-Lazo R, Binks DJ, Smith M, Raftery J, Whitehead GFS, O'Brien P, Lewis DJ. Synthesis, X-ray Single-Crystal Structural Characterization, and Thermal Analysis of Bis(O-alkylxanthato)Cd(II) and Bis(O-alkylxanthato)Zn(II) Complexes Used as Precursors for Cadmium and Zinc Sulfide Thin Films. Inorg Chem 2021; 60:7573-7583. [PMID: 33949858 DOI: 10.1021/acs.inorgchem.1c01110] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This work investigates tuning of the molecular structure of a series of O-alkylxanthato zinc and cadmium precursor complexes to enhance production of ZnS and CdS materials. The structures of several bis(O-alkylxanthato) cadmium(II) complexes (8-13) and bis(O-alkyl xanthato)zinc(II) complexes (18 and 19) are reported based on single crystal X-ray diffraction data. CdS and ZnS films were produced by the spin-coating of these metal complexes followed by their thermal decomposition to the corresponding metal sulfides. Thin films of CdS were deposited by spin-coating the bis(O-alkylxanthato) cadmium(II) precursors (7-13) on glass substrates, followed by annealing at 300 °C for 60 min. Thin films of ZnS were deposited by spin-coating bis(O-alkylxanthato) zinc(II) (14-20), followed by annealing at 200 °C for 60 min. The molecular complexes and solid state materials are characterized using a range of techniques including single-crystal X-ray diffraction, pXRD, EDS and XPS, DSC and TGA, UV-vis and PL spectroscopies, and electron microscopy. These techniques provided information on the influence of alkyl chain length on the thermal conditions required to fabricate metal sulfide films as well as film properties such as film quality, and morphology. For example, the obtained crystallite size of metal sulfide films formed is correlated to the hydrocarbon chain length of xanthate ligands in the precursor. The behavior of the complexes under thermal stress was therefore studied in detail. DTA and TGA profiles explain the relationship between hydrocarbon chain length, decomposition temperatures, and the energies required for decomposition. A higher decomposition temperature for complexes with longer hydrocarbon chains is observed compared to complexes with shorter hydrocarbon chains. Band-gap energies calculated from the optical absorption spectra alongside steady state and time-resolved photoluminescence studies are reported for CdS films.
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Affiliation(s)
- Ali A K Bakly
- Department of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - David Collison
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Ruben Ahumada-Lazo
- Department of Physics and Astronomy and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - David J Binks
- Department of Physics and Astronomy and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Matthew Smith
- Department of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - James Raftery
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - George F S Whitehead
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Paul O'Brien
- Department of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.,Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - David J Lewis
- Department of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
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20
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Alotaibi R, Fowler JM, Lockyer SJ, Timco GA, Collison D, Schnack J, Winpenny REP. The Synthesis and Characterisation of a Molecular Sea-Serpent: Studies of a {Cr 24 Cu 7 } Chain. Angew Chem Int Ed Engl 2021; 60:9489-9492. [PMID: 33576165 PMCID: PMC8251705 DOI: 10.1002/anie.202015731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Indexed: 11/06/2022]
Abstract
A finite chain of thirty-one paramagnetic centers is reported, synthesized by reaction of hydrated chromium fluoride, copper carbonate and pivalic acid in the presence of 1,4,7,10-tetrazacyclododecane (cyclen). Magnetic studies show predominantly anti-ferromagnetic exchange leading to a high density of low-lying spin states and large saturation field.
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Affiliation(s)
- Rajeh Alotaibi
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Jonathan M Fowler
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Selena J Lockyer
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Grigore A Timco
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - David Collison
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Jürgen Schnack
- Faculty of Physics, Bielefeld University, P.O. box 100131, 33501, Bielefeld, Germany
| | - Richard E P Winpenny
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
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21
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Alotaibi R, Fowler JM, Lockyer SJ, Timco GA, Collison D, Schnack J, Winpenny REP. The Synthesis and Characterisation of a Molecular Sea‐Serpent: Studies of a {Cr
24
Cu
7
} Chain. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202015731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Rajeh Alotaibi
- Department of Chemistry The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Jonathan M. Fowler
- Department of Chemistry The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Selena J. Lockyer
- Department of Chemistry The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Grigore A. Timco
- Department of Chemistry The University of Manchester Oxford Road Manchester M13 9PL UK
| | - David Collison
- Department of Chemistry The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Jürgen Schnack
- Faculty of Physics Bielefeld University P.O. box 100131 33501 Bielefeld Germany
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22
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Asthana D, Lockyer SJ, Nawaz S, Woolfson RJ, Timco GA, Muryn CA, Vitorica-Yrezabal IJ, Collison D, Burton NA, Winpenny REP. Gold(i) bridged dimeric and trimeric heterometallic {Cr 7Ni}-based qubit systems and their characterization. Dalton Trans 2021; 50:4390-4395. [PMID: 33704335 DOI: 10.1039/d1dt00150g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Gold(i) bridged dimeric and trimeric structures of a ground state spin S = 1/2 heterometallic {Cr7Ni} wheel have been prepared and studied by continuous wave (CW) and pulsed wave EPR spectrometry. The {Cr7Ni} relaxation time constants (T1 and Tm) show rates matching well with previous observations. Four pulse Double Electron Resonance (DEER) studies suggest presence of more than one conformations. Small Angle X-ray Scattering (SAXS) in conjunction with Molecular Dynamic (MD) Simulations were performed to look at the possible conformations in solution. In line with DEER results, simulation data further indicated more flexible molecular geometry in solution than the one in solid state.
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Affiliation(s)
- Deepak Asthana
- The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
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23
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Zhao EW, Jónsson E, Jethwa RB, Hey D, Lyu D, Brookfield A, Klusener PAA, Collison D, Grey CP. Coupled In Situ NMR and EPR Studies Reveal the Electron Transfer Rate and Electrolyte Decomposition in Redox Flow Batteries. J Am Chem Soc 2021; 143:1885-1895. [PMID: 33475344 PMCID: PMC7877726 DOI: 10.1021/jacs.0c10650] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
![]()
We
report the development of in situ (online) EPR and coupled EPR/NMR methods to study redox flow
batteries, which are applied here to investigate the redox-active
electrolyte, 2,6-dihydroxyanthraquinone (DHAQ). The radical
anion, DHAQ3–•, formed as a reaction intermediate
during the reduction of DHAQ2–, was detected and
its concentration quantified during electrochemical cycling. The fraction
of the radical anions was found to be concentration-dependent, the
fraction decreasing as the total concentration of DHAQ increases,
which we interpret in terms of a competing dimer formation mechanism.
Coupling the two techniques—EPR and NMR—enables the
rate constant for the electron transfer between DHAQ3–• and DHAQ4– anions to be determined. We quantify
the concentration changes of DHAQ during the “high-voltage”
hold by NMR spectroscopy and correlate it quantitatively to the capacity
fade of the battery. The decomposition products, 2,6-dihydroxyanthrone
and 2,6-dihydroxyanthranol, were identified during this hold;
they were shown to undergo subsequent irreversible electrochemical
oxidation reaction at 0.7 V, so that they no longer participate in
the subsequent electrochemistry of the battery when operated in the
standard voltage window of the cell. The decomposition reaction rate
was found to be concentration-dependent, with a faster rate being
observed at higher concentrations. Taking advantage of the inherent
flow properties of the system, this work demonstrates the possibility
of multi-modal in situ (online)
characterizations of redox flow batteries, the characterization techniques
being applicable to a range of electrochemical flow systems.
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Affiliation(s)
- Evan Wenbo Zhao
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Erlendur Jónsson
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Rajesh B Jethwa
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Dominic Hey
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Dongxun Lyu
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Adam Brookfield
- Department of Chemistry & Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Peter A A Klusener
- Shell Global Solutions International B.V., Shell Technology Centre Amsterdam, Grasweg 31, 1031 HW Amsterdam, The Netherlands
| | - David Collison
- Department of Chemistry & Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Clare P Grey
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
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24
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Alsowayigh MM, Timco GA, Borilovic I, Alanazi A, Vitorica-Yrezabal IJ, Whitehead GFS, McNaughter PD, Tuna F, O'Brien P, Winpenny REP, Lewis DJ, Collison D. Heterometallic 3d-4f Complexes as Air-Stable Molecular Precursors in Low Temperature Syntheses of Stoichiometric Rare-Earth Orthoferrite Powders. Inorg Chem 2020; 59:15796-15806. [PMID: 33044071 DOI: 10.1021/acs.inorgchem.0c02249] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Four 3d-4f hetero-polymetallic complexes [Fe2Ln2((OCH2)3CR)2(O2CtBu)6(H2O)4] (where Ln = La (1 and 2) and Gd (3 and 4); and R = Me (1 and 3) and Et (2 and 4)) are synthesized and analyzed using elemental analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis, and SQUID magnetometry. Crystal structures are obtained for both methyl derivatives and show that the complexes are isostructural and adopt a defective dicubane topology. The four heavy metals are connected with two alkoxide bridges. These four precursors are used as single-source precursors to prepare rare-earth orthoferrite pervoskites of the form LnFeO3. Thermal decomposition in a ceramic boat in a tube furnace gives orthorhombic LnFeO3 powders using optimized temperatures and decomposition times: LaFeO3 formed at 650 °C over 30 min, whereas GdFeO3 formed at 750 °C over 18 h. These materials are structurally characterized using powder X-ray diffraction, Raman spectroscopy, scanning electron microscopy, energy-dispersive X-ray map spectroscopy, and SQUID magnetometry. EDX spectroscopy mapping reveals a homogeneous spatial distribution of elements for all four materials consistent with LnFeO3. Magnetic measurements on complexes 1-4 confirm the presence of weak antiferromagnetic coupling between the central Fe(III) ions of the clusters and negligible ferromagnetic interaction with peripheral Gd(III) ions in 3 and 4. Zero-field-cooled and field-cooled measurements of magnetization of LaFeO3 and GdFeO3 in the solid-state suggest that both materials are ferromagnetic, and both materials show open magnetic hysteresis loops at 5 and 300 K, with Msat higher than previously reported for these nanomaterials. We conclude that this is a new and facile low temperature route to these important magnetic materials that is potentially universal, limited only by what metals can be programmed into the precursor complexes.
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Affiliation(s)
- Marwah M Alsowayigh
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom.,Chemistry Department, College of Science, King Faisal University, P.O. 380, Al-Ahsa 31982, Kingdom of Saudia Arabia
| | - Grigore A Timco
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Ivana Borilovic
- Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Abdulaziz Alanazi
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Inigo J Vitorica-Yrezabal
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - George F S Whitehead
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Paul D McNaughter
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Floriana Tuna
- Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Paul O'Brien
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom.,Department of Materials, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - Richard E P Winpenny
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - David J Lewis
- Department of Materials, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
| | - David Collison
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
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25
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Doheny PW, Clegg JK, Tuna F, Collison D, Kepert CJ, D'Alessandro DM. Quantification of the mixed-valence and intervalence charge transfer properties of a cofacial metal-organic framework via single crystal electronic absorption spectroscopy. Chem Sci 2020; 11:5213-5220. [PMID: 34122977 PMCID: PMC8159307 DOI: 10.1039/d0sc01521k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Gaining a fundamental understanding of charge transfer mechanisms in three-dimensional Metal-Organic Frameworks (MOFs) is crucial to the development of electroactive and conductive porous materials. These materials have potential in applications in porous conductors, electrocatalysts and energy storage devices; however the structure-property relationships pertaining to charge transfer and its quantification are relatively poorly understood. Here, the cofacial Cd(ii)-based MOF [Cd(BPPTzTz)(tdc)]·2DMF (where BPPTzTz = 2,5-bis(4-(pyridin-4-yl)phenyl)thiazolo[5,4-d]thiazole, tdc2- = 2,5-thiophene dicarboxylate) exhibits Intervalence Charge Transfer (IVCT) within its three-dimensional structure by virtue of the close, cofacial stacking of its redox-active BPPTzTz ligands. The mixed-valence and IVCT properties are characterised using a combined electrochemical, spectroelectrochemical and computational approach. Single crystal electronic absorption spectroscopy was employed to obtain the solid-state extinction coefficient, enabling the application of Marcus-Hush theory. The electronic coupling constant, H ab, of 145 cm-1 was consistent with the localised mixed-valence properties of both this framework and analogous systems that use alternative methods to obtain the H ab parameter. This work demonstrates the first report of the successful characterisation of IVCT in a MOF material using single crystal electronic absorption spectroscopy and serves as an attractive alternative to more complex methods due to its simplicity and applicability.
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Affiliation(s)
- Patrick W Doheny
- School of Chemistry, The University of Sydney New South Wales 2006 Australia +61 2 93513777
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland St Lucia Queensland 4072 Australia
| | - Floriana Tuna
- Department of Chemistry and Photon Science Institute, The University of Manchester Manchester M13 9PL UK
| | - David Collison
- Department of Chemistry and Photon Science Institute, The University of Manchester Manchester M13 9PL UK
| | - Cameron J Kepert
- School of Chemistry, The University of Sydney New South Wales 2006 Australia +61 2 93513777
| | - Deanna M D'Alessandro
- School of Chemistry, The University of Sydney New South Wales 2006 Australia +61 2 93513777
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26
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Giansiracusa MJ, Al-Badran S, Kostopoulos AK, Whitehead GFS, McInnes EJL, Collison D, Winpenny REP, Chilton NF. Magnetic exchange interactions in symmetric lanthanide dimetallics. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00854k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multi-frequency EPR spectra and CASSCF-SO calculations on two symmetric homo-dimetallic lanthanide complexes are used to determine the magnetic exchange coupling in the low-lying states.
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Affiliation(s)
| | - Susan Al-Badran
- Department of Chemistry
- The University of Manchester
- Manchester
- UK
- Chemistry Department
| | | | | | | | - David Collison
- Department of Chemistry
- The University of Manchester
- Manchester
- UK
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27
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Alderhami SA, Collison D, Lewis DJ, McNaughter PD, O'Brien P, Spencer BF, Vitorica-Yrezabal I, Whitehead G. Accessing γ-Ga 2S 3 by solventless thermolysis of gallium xanthates: a low-temperature limit for crystalline products. Dalton Trans 2019; 48:15605-15612. [PMID: 31389451 DOI: 10.1039/c9dt02061f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Alkyl-xanthato gallium(iii) complexes of the form [Ga(S2COR)3], where R = Me (1), Et (2), iPr (3), nPr (4), nBu (5), sBu (6) and iBu (7), have been synthesized and fully characterised. The crystal structures for 1 and 3-7 have been solved and examined to elucidate if these structures are related to their decomposition. Thermogravimetric analysis was used to gain insight into the decomposition temperatures for each complex. Unlike previously explored metal xanthate complexes which break down at low temperatures (<250 °C), to form crystalline metal chalcogenides, powder X-ray diffraction measurements suggest that when R ≥ Et these complexes did not produce crystalline gallium sulfides until heated to 500 °C, where γ-Ga2S3 was the sole product formed. In the case of R = Me, Chugaev elimination did not occur and amorphous GaxSy products were formed. We conclude therefore that the low-temperature synthesis route offered by the thermal decomposition of metal xanthate precursors, which has been reported for many metal sulfide systems prior to this, may not be appropriate in the case of gallium sulfides.
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Affiliation(s)
- Suliman A Alderhami
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK and Chemistry Department, Faculty of Science and Arts, Al-Baha University, Al Makhwah, Saudi Arabia
| | - David Collison
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - David J Lewis
- School of Materials, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
| | - Paul D McNaughter
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Paul O'Brien
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK and School of Materials, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
| | - Ben F Spencer
- School of Materials, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
| | | | - George Whitehead
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
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28
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Cacciottolo TM, Perikari A, van der Klaauw A, Henning E, Stadler LKJ, Keogh J, Farooqi IS, Tenin G, Keavney B, Ryan E, Budd R, Bewley M, Coelho P, Rumsey W, Sanchez Y, McCafferty J, Dockrell D, Walmsley S, Whyte M, Liu Y, Choy MK, Tenin G, Abraham S, Black G, Keavney B, Ford T, Stanley B, Good R, Rocchiccioli P, McEntegart M, Watkins S, Eteiba H, Shaukat A, Lindsay M, Robertson K, Hood S, McGeoch R, McDade R, Sidik N, McCartney P, Corcoran D, Collison D, Rush C, McConnachie A, Touyz R, Oldroyd K, Berry C, Gazdagh G, Diver L, Marshall J, McGowan R, Ahmed F, Tobias E, Curtis E, Parsons C, Maslin K, D'Angelo S, Moon R, Crozier S, Gossiel F, Bishop N, Kennedy S, Papageorghiou A, Fraser R, Gandhi S, Prentice A, Inskip H, Godfrey K, Schoenmakers I, Javaid MK, Eastell R, Cooper C, Harvey N, Watt ER, Howden A, Mirchandani A, Coelho P, Hukelmann JL, Sadiku P, Plant TM, Cantrell DA, Whyte MKB, Walmsley SR, Mordi I, Forteath C, Wong A, Mohan M, Palmer C, Doney A, Rena G, Lang C, Gray EH, Azarian S, Riva A, Edwards H, McPhail MJW, Williams R, Chokshi S, Patel VC, Edwards LA, Page D, Miossec M, Williams S, Monaghan R, Fotiou E, Santibanez-Koref M, Keavney B, Badat M, Mettananda S, Hua P, Schwessinger R, Hughes J, Higgs D, Davies J. Scientific Business Abstracts of the 113th Annual Meeting of the Association of Physicians of Great Britain and Ireland. QJM 2019; 112:724-729. [PMID: 31505685 DOI: 10.1093/qjmed/hcz175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
| | - A Perikari
- University of Cambridge Metabolic Research Laboratories
| | | | - E Henning
- University of Cambridge Metabolic Research Laboratories
| | - L K J Stadler
- University of Cambridge Metabolic Research Laboratories
| | - J Keogh
- University of Cambridge Metabolic Research Laboratories
| | - I S Farooqi
- University of Cambridge Metabolic Research Laboratories
| | - G Tenin
- From University of Manchester
| | | | - E Ryan
- Department of Respiratory Medicine, Centre for Inflammation Research, University of Edinburgh
| | - R Budd
- Department of Infection Immunity and Cardiovascular Disease, The Florey Institute for Host-Pathogen Interactions, University of Sheffield
| | - M Bewley
- Department of Infection Immunity and Cardiovascular Disease, The Florey Institute for Host-Pathogen Interactions, University of Sheffield
| | - P Coelho
- Department of Respiratory Medicine, Centre for Inflammation Research, University of Edinburgh
| | - W Rumsey
- Stress and Repair Discovery Performance Unit, Respiratory Therapy Area
| | - Y Sanchez
- Stress and Repair Discovery Performance Unit, Respiratory Therapy Area
| | - J McCafferty
- Department of Respiratory Medicine, Centre for Inflammation Research, University of Edinburgh
| | - D Dockrell
- Department of Respiratory Medicine, Centre for Inflammation Research, University of Edinburgh
| | - S Walmsley
- Department of Respiratory Medicine, Centre for Inflammation Research, University of Edinburgh
| | - M Whyte
- Department of Respiratory Medicine, Centre for Inflammation Research, University of Edinburgh
| | - Y Liu
- From the University of Manchester
| | - M-K Choy
- From the University of Manchester
| | - G Tenin
- From the University of Manchester
| | | | - G Black
- From the University of Manchester
| | | | - T Ford
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | | | - R Good
- Golden Jubilee National Hospital
| | - P Rocchiccioli
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | - M McEntegart
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | | | - H Eteiba
- Golden Jubilee National Hospital
| | | | | | | | - S Hood
- Golden Jubilee National Hospital
| | | | - R McDade
- Golden Jubilee National Hospital
| | - N Sidik
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | - P McCartney
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | - D Corcoran
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | - D Collison
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | - C Rush
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | | | - R Touyz
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
| | - K Oldroyd
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | - Colin Berry
- BHF Centre of Excellence in Vascular Science and Medicine, University of Glasgow
- Golden Jubilee National Hospital
| | - G Gazdagh
- School of Medicine, Dentistry & Nursing, College of Medical, Veterinary and Life Sciences, University of Glasgow
| | - L Diver
- West of Scotland Regional Genetics Service, Laboratory Medicine Building, Queen Elizabeth University Hospital
| | - J Marshall
- Institute of Cancer Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow
| | - R McGowan
- West of Scotland Regional Genetics Service, Laboratory Medicine Building, Queen Elizabeth University Hospital
| | - F Ahmed
- Developmental Endocrinology Research Group, Royal Hospital for Children, University of Glasgow
| | - E Tobias
- Academic Unit of Medical Genetics and Clinical Pathology, Laboratory Medicine Building, Queen Elizabeth University Hospital, University of Glasgow
| | - E Curtis
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - C Parsons
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - K Maslin
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - S D'Angelo
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - R Moon
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - S Crozier
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - F Gossiel
- Academic Unit of Bone Metabolism, University of Sheffield
| | - N Bishop
- Academic Unit of Child Health, University of Sheffield
| | - S Kennedy
- Nuffield Department of Women's & Reproductive Health, John Radcliffe Hospital, University of Oxford
| | - A Papageorghiou
- Nuffield Department of Women's & Reproductive Health, John Radcliffe Hospital, University of Oxford
| | - R Fraser
- Department of Obstetrics and Gynaecology, Sheffield Hospitals NHS Trust, University of Sheffield
| | - S Gandhi
- Department of Obstetrics and Gynaecology, Sheffield Hospitals NHS Trust, University of Sheffield
| | | | - H Inskip
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - K Godfrey
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - I Schoenmakers
- Department of Medicine, Faculty of Medicine and Health Sciences, University of East Anglia
| | - M K Javaid
- NIHR Oxford Biomedical Research Centre, University of Oxford
| | - R Eastell
- Academic Unit of Bone Metabolism, University of Sheffield
| | - C Cooper
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | - N Harvey
- MRC Lifecourse Epidemiology Unit, University of Southampton
| | | | - A Howden
- School of Life Sciences, University of Dundee
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - E H Gray
- Institute of Hepatology, Foundation for Liver Research
- School of Immunology and Microbial Sciences, King's College London
| | - S Azarian
- Institute of Hepatology, Foundation for Liver Research
| | - A Riva
- Institute of Hepatology, Foundation for Liver Research
- School of Immunology and Microbial Sciences, King's College London
| | - H Edwards
- Institute of Hepatology, Foundation for Liver Research
- School of Immunology and Microbial Sciences, King's College London
| | - M J W McPhail
- School of Immunology and Microbial Sciences, King's College London
- Institute of Liver Studies & Transplantation, King's College Hospital
| | - R Williams
- Institute of Hepatology, Foundation for Liver Research
- School of Immunology and Microbial Sciences, King's College London
| | - S Chokshi
- Institute of Hepatology, Foundation for Liver Research
- School of Immunology and Microbial Sciences, King's College London
| | - V C Patel
- Institute of Hepatology, Foundation for Liver Research
- School of Immunology and Microbial Sciences, King's College London
- Institute of Liver Studies & Transplantation, King's College Hospital
| | - L A Edwards
- Institute of Hepatology, Foundation for Liver Research
- School of Immunology and Microbial Sciences, King's College London
| | - D Page
- University of Manchester
- Manchester Metropolitan University
| | - M Miossec
- Manchester Metropolitan University
- University of Newcastle
| | | | | | | | | | | | - M Badat
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital
| | - S Mettananda
- Department of Paediatrics, Faculty of Medicine, University of Kelaniya
| | - P Hua
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital
| | - R Schwessinger
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital
| | - J Hughes
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital
| | - D Higgs
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital
| | - J Davies
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital
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29
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Giansiracusa MJ, Kostopoulos AK, Collison D, Winpenny REP, Chilton NF. Correlating blocking temperatures with relaxation mechanisms in monometallic single-molecule magnets with high energy barriers (Ueff > 600 K). Chem Commun (Camb) 2019; 55:7025-7028. [DOI: 10.1039/c9cc02421b] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Correlating blocking temperatures with relaxation mechanisms in single-molecule magnets.
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Affiliation(s)
| | | | - David Collison
- The School of Chemistry
- The University of Manchester Oxford Road
- Manchester
- UK
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30
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Giansiracusa MJ, Al-Badran S, Kostopoulos AK, Whitehead GFS, Collison D, Tuna F, Winpenny REP, Chilton NF. A large barrier single-molecule magnet without magnetic memory. Dalton Trans 2019; 48:10795-10798. [DOI: 10.1039/c9dt01791g] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We report a six coordinate DyIII single-molecule magnet (SMM) with an energy barrier of 1110 K for thermal relaxation of magnetization, but no magnetic hysteresis above 2 K.
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Affiliation(s)
| | - Susan Al-Badran
- The School of Chemistry
- The University of Manchester
- Manchester
- UK
- Chemistry Department
| | | | | | - David Collison
- The School of Chemistry
- The University of Manchester
- Manchester
- UK
| | - Floriana Tuna
- The School of Chemistry
- The University of Manchester
- Manchester
- UK
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31
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Chauhan A, Lalor T, Watson S, Adams D, Farrah TE, Anand A, Kimmitt R, Mills NL, Webb DJ, Dhaun N, Kalla R, Adams A, Vatn S, Bonfliglio F, Nimmo E, Kennedy N, Ventham N, Vatn M, Ricanek P, Halfvarson J, Soderhollm J, Pierik M, Torkvist L, Gomollon F, Gut I, Jahnsen J, Satsangi J, Body R, Almashali M, McDowell G, Taylor P, Lacey A, Rees A, Dayan C, Lazarus J, Nelson S, Okosieme O, Corcoran D, Young R, Ciadella P, McCartney P, Bajrangee A, Hennigan B, Collison D, Carrick D, Shaukat A, Good R, Watkins S, McEntegart M, Watt J, Welsh P, Sattar N, McConnachie A, Oldroyd K, Berry C, Parks T, Auckland K, Mentzer AJ, Kado J, Mirabel MM, Kauwe JK, Robson KJ, Mittal B, Steer AC, Hill AVS, Akbar M, Forrester M, Virlan AT, Gilmour A, Wallace C, Paterson C, Reid D, Siebert S, Porter D, Liversidge J, McInnes I, Goodyear C, Athwal V, Pritchett J, Zaitoun A, Irving W, Guha IN, Hanley NA, Hanley KP, Briggs T, Reynolds J, Rice G, Bondet V, Bruce E, Crow Y, Duffy D, Parker B, Bruce I, Martin K, Pritchett J, Aoibheann Mullan M, Llewellyn J, Athwal V, Zeef L, Farrow S, Streuli C, Henderson N, Friedman S, Hanley N, Hanley KP. Scientific Business Abstracts of the 112th Annual Meeting of the Association of Physicians of Great Britain and Ireland. QJM 2018; 111:920-924. [PMID: 31222346 DOI: 10.1093/qjmed/hcy193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - T Lalor
- From the University of Birmingham
| | - S Watson
- From the University of Birmingham
| | - D Adams
- From the University of Birmingham
| | - T E Farrah
- From the University/British Heart Foundation Centre of Research Excellence, University of Edinburgh
| | - A Anand
- From the University/British Heart Foundation Centre of Research Excellence, University of Edinburgh
| | - R Kimmitt
- From the University/British Heart Foundation Centre of Research Excellence, University of Edinburgh
| | - N L Mills
- From the University/British Heart Foundation Centre of Research Excellence, University of Edinburgh
| | - D J Webb
- From the University/British Heart Foundation Centre of Research Excellence, University of Edinburgh
| | - N Dhaun
- From the University/British Heart Foundation Centre of Research Excellence, University of Edinburgh
| | - R Kalla
- From the University of Edinburgh
| | - A Adams
- From the University of Edinburgh
| | - S Vatn
- Akerhshus University Hospital
| | | | - E Nimmo
- From the University of Edinburgh
| | | | | | | | | | | | | | - M Pierik
- Maastricht University Medical Centre
| | | | | | | | | | | | - R Body
- From the University of Manchester
| | - M Almashali
- Manchester University Hospitals Foundation NHS Trust
| | | | | | | | - A Rees
- From the Cardiff University
| | | | | | | | | | - D Corcoran
- From the British Heart Foundation (BHF), Glasgow Cardiovascular Research Centre, University of Glasgow
| | - R Young
- Robertson Centre for Biostatistics, University of Glasgow
| | - P Ciadella
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital
| | - P McCartney
- From the British Heart Foundation (BHF), Glasgow Cardiovascular Research Centre, University of Glasgow
| | - A Bajrangee
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital
| | - B Hennigan
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital
| | - D Collison
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital
| | - D Carrick
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital
| | - A Shaukat
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital
| | - R Good
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital
| | - S Watkins
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital
| | - M McEntegart
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital
| | - J Watt
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital
| | - P Welsh
- From the British Heart Foundation (BHF), Glasgow Cardiovascular Research Centre, University of Glasgow
| | - N Sattar
- From the British Heart Foundation (BHF), Glasgow Cardiovascular Research Centre, University of Glasgow
| | - A McConnachie
- Robertson Centre for Biostatistics, University of Glasgow
| | - K Oldroyd
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital
| | - C Berry
- From the British Heart Foundation (BHF), Glasgow Cardiovascular Research Centre, University of Glasgow
| | - T Parks
- From the London School of Hygiene and Tropical Medicine
- University of Oxford
| | | | | | - J Kado
- Fiji Islands Ministry of Health and Medical Services
| | - M M Mirabel
- French National Institute of Health and Medical Research
| | | | | | - B Mittal
- Babasaheb Bhimrao Ambedkar University
| | - A C Steer
- Murdoch Children's Research Institute
| | | | - M Akbar
- From the Institute of Infection, Immunity & Inflammation, University of Glasgow
| | - M Forrester
- Division of Applied Medicine, School of Medicine and Dentistry, University of Aberdeen
| | - A T Virlan
- From the Institute of Infection, Immunity & Inflammation, University of Glasgow
| | - A Gilmour
- From the Institute of Infection, Immunity & Inflammation, University of Glasgow
| | - C Wallace
- Division of Applied Medicine, School of Medicine and Dentistry, University of Aberdeen
| | - C Paterson
- From the Institute of Infection, Immunity & Inflammation, University of Glasgow
| | - D Reid
- Division of Applied Medicine, School of Medicine and Dentistry, University of Aberdeen
| | - S Siebert
- From the Institute of Infection, Immunity & Inflammation, University of Glasgow
| | - D Porter
- From the Institute of Infection, Immunity & Inflammation, University of Glasgow
| | - J Liversidge
- Division of Applied Medicine, School of Medicine and Dentistry, University of Aberdeen
| | - I McInnes
- From the Institute of Infection, Immunity & Inflammation, University of Glasgow
| | - C Goodyear
- From the Institute of Infection, Immunity & Inflammation, University of Glasgow
| | - V Athwal
- From the Manchester University Foundation NHS Trust
- University of Manchester
| | | | | | | | | | - N A Hanley
- From the Manchester University Foundation NHS Trust
- University of Manchester
| | | | - T Briggs
- From the Manchester Centre of Genomic Medicine, University of Manchester
| | - J Reynolds
- Division of Musculoskeletal & Dermatological Sciences, University of Manchester
| | - G Rice
- From the Manchester Centre of Genomic Medicine, University of Manchester
| | - V Bondet
- Immunobiology of Dendritic Cells, Institut Pasteur
| | - E Bruce
- Division of Musculoskeletal & Dermatological Sciences, University of Manchester
| | - Y Crow
- Laboratory of Neurogenetics and Neuroinflammation, INSERM UMR1163, Institut Imagine
| | - D Duffy
- Immunobiology of Dendritic Cells, Institut Pasteur
| | - B Parker
- Division of Musculoskeletal & Dermatological Sciences, University of Manchester
| | - I Bruce
- Division of Musculoskeletal & Dermatological Sciences, University of Manchester
| | - K Martin
- From the University of Manchester
| | | | | | | | - V Athwal
- From the University of Manchester
| | - L Zeef
- From the University of Manchester
| | - S Farrow
- From the University of Manchester
- Respiratory Therapy Area, GlaxoSmithKline
| | | | | | | | - N Hanley
- From the University of Manchester
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32
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Corcoran D, Young R, Cialdella P, McCartney P, Bajrangee A, Hennigan B, Collison D, Carrick D, Shaukat A, Good R, Watkins S, McEntegart M, Watt J, Welsh P, Sattar N, McConnachie A, Oldroyd KG, Berry C. The effects of remote ischaemic preconditioning on coronary artery function in patients with stable coronary artery disease. Int J Cardiol 2018; 252:24-30. [PMID: 29249435 PMCID: PMC5761717 DOI: 10.1016/j.ijcard.2017.10.082] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2017] [Revised: 10/09/2017] [Accepted: 10/19/2017] [Indexed: 01/06/2023]
Abstract
Background Remote ischaemic preconditioning (RIPC) is a cardioprotective intervention invoking intermittent periods of ischaemia in a tissue or organ remote from the heart. The mechanisms of this effect are incompletely understood. We hypothesised that RIPC might enhance coronary vasodilatation by an endothelium-dependent mechanism. Methods We performed a prospective, randomised, sham-controlled, blinded clinical trial. Patients with stable coronary artery disease (CAD) undergoing elective invasive management were prospectively enrolled, and randomised to RIPC or sham (1:1) prior to angiography. Endothelial-dependent vasodilator function was assessed in a non-target coronary artery with intracoronary infusion of incremental acetylcholine doses (10− 6, 10− 5, 10− 4 mol/l). Venous blood was sampled pre- and post-RIPC or sham, and analysed for circulating markers of endothelial function. Coronary luminal diameter was assessed by quantitative coronary angiography. The primary outcome was the between-group difference in the mean percentage change in coronary luminal diameter following the maximal acetylcholine dose (Clinicaltrials.gov identifier: NCT02666235). Results 75 patients were enrolled. Following angiography, 60 patients (mean ± SD age 57.5 ± 8.5 years; 80% male) were eligible and completed the protocol (n = 30 RIPC, n = 30 sham). The mean percentage change in coronary luminal diameter was − 13.3 ± 22.3% and − 2.0 ± 17.2% in the sham and RIPC groups respectively (difference 11.32%, 95%CI: 1.2– 21.4, p = 0.032). This remained significant when age and sex were included as covariates (difference 11.01%, 95%CI: 1.01– 21.0, p = 0.035). There were no between-group differences in endothelial-independent vasodilation, ECG parameters or circulating markers of endothelial function. Conclusions RIPC attenuates the extent of vasoconstriction induced by intracoronary acetylcholine infusion. This endothelium-dependent mechanism may contribute to the cardioprotective effects of RIPC.
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Affiliation(s)
- D Corcoran
- British Heart Foundation Glasgow Cardiovascular Research Centre, University of Glasgow, Scotland, UK; West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK
| | - R Young
- Robertson Centre for Biostatistics, University of Glasgow, Scotland, UK
| | - P Cialdella
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK
| | - P McCartney
- British Heart Foundation Glasgow Cardiovascular Research Centre, University of Glasgow, Scotland, UK; West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK
| | - A Bajrangee
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK
| | - B Hennigan
- British Heart Foundation Glasgow Cardiovascular Research Centre, University of Glasgow, Scotland, UK; West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK
| | - D Collison
- British Heart Foundation Glasgow Cardiovascular Research Centre, University of Glasgow, Scotland, UK
| | - D Carrick
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK
| | - A Shaukat
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK
| | - R Good
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK
| | - S Watkins
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK
| | - M McEntegart
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK
| | - J Watt
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK
| | - P Welsh
- British Heart Foundation Glasgow Cardiovascular Research Centre, University of Glasgow, Scotland, UK
| | - N Sattar
- British Heart Foundation Glasgow Cardiovascular Research Centre, University of Glasgow, Scotland, UK
| | - A McConnachie
- Robertson Centre for Biostatistics, University of Glasgow, Scotland, UK
| | - K G Oldroyd
- West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK
| | - C Berry
- British Heart Foundation Glasgow Cardiovascular Research Centre, University of Glasgow, Scotland, UK; West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK.
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33
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Dendrinou‐Samara C, Walsh JPS, Muryn CA, Collison D, Winpenny REP, Tuna F. Evidence of Spin Canting, Metamagnetism, Negative Coercivity and Slow Relaxation in a Two‐Dimensional Network of {Mn
6
} Cages. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201700832] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - James P. S. Walsh
- Department of Chemistry and Photon Science Institute The University of Manchester Oxford Road M13 9PL Manchester UK
- Department of Chemistry Northwestern University 2145 Sheridan Road 60208 Evanston IL USA
| | - Christopher A. Muryn
- Department of Chemistry and Photon Science Institute The University of Manchester Oxford Road M13 9PL Manchester UK
| | - David Collison
- Department of Chemistry and Photon Science Institute The University of Manchester Oxford Road M13 9PL Manchester UK
| | - Richard E. P. Winpenny
- Department of Chemistry and Photon Science Institute The University of Manchester Oxford Road M13 9PL Manchester UK
| | - Floriana Tuna
- Department of Chemistry and Photon Science Institute The University of Manchester Oxford Road M13 9PL Manchester UK
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Giansiracusa MJ, Moreno-Pineda E, Hussain R, Marx R, Martínez Prada M, Neugebauer P, Al-Badran S, Collison D, Tuna F, van Slageren J, Carretta S, Guidi T, McInnes EJL, Winpenny REP, Chilton NF. Measurement of Magnetic Exchange in Asymmetric Lanthanide Dimetallics: Toward a Transferable Theoretical Framework. J Am Chem Soc 2018; 140:2504-2513. [DOI: 10.1021/jacs.7b10714] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
| | - Eufemio Moreno-Pineda
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Riaz Hussain
- Dipartimento di Scienze Matematiche, Fisiche ed Informatiche, Università di Parma, Parco Area delle Scienze 7/a, Parma 43124, Italy
| | - Raphael Marx
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - María Martínez Prada
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Petr Neugebauer
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Susan Al-Badran
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - David Collison
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Floriana Tuna
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Joris van Slageren
- Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Stefano Carretta
- Dipartimento di Scienze Matematiche, Fisiche ed Informatiche, Università di Parma, Parco Area delle Scienze 7/a, Parma 43124, Italy
| | - Tatiana Guidi
- ISIS Facility, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot OX11 0QX, U.K
| | - Eric J. L. McInnes
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | | | - Nicholas F. Chilton
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
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35
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Collison D. Symmetry. Spectroscopy and crystallography: the structural nexus. CRYSTALLOGR REV 2017. [DOI: 10.1080/0889311x.2017.1405947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- David Collison
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
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Melhuish SJ, Stott C, Ariciu AM, Martinis L, McCulloch M, Piccirillo L, Collison D, Tuna F, Winpenny R. A sub-Kelvin cryogen-free EPR system. J Magn Reson 2017; 282:83-88. [PMID: 28783525 DOI: 10.1016/j.jmr.2017.07.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 07/13/2017] [Accepted: 07/18/2017] [Indexed: 06/07/2023]
Abstract
We present an EPR instrument built for operation at Q band below 1K. Our cryogen-free Dewar integrates with a commercial electro-magnet and bridge. A description of the cryogenic and RF systems is given, along with the adaptations to the standard EPR experiment for operation at sub-Kelvin temperatures. As a first experiment, the EPR spectra of powdered Cr12O9(OH)3 [Formula: see text] were measured. The sub-Kelvin EPR spectra agree well with predictions, and the performance of the sub-Kelvin system at 5K is compared to that of a commercial spectrometer.
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Affiliation(s)
- Simon J Melhuish
- Jodrell Bank Centre for Astrophysics, Alan Turing Building, School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom.
| | - Chloe Stott
- School of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Ana-Maria Ariciu
- School of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Lorenzo Martinis
- Jodrell Bank Centre for Astrophysics, Alan Turing Building, School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Mark McCulloch
- Jodrell Bank Centre for Astrophysics, Alan Turing Building, School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Lucio Piccirillo
- Jodrell Bank Centre for Astrophysics, Alan Turing Building, School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - David Collison
- School of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Richard Winpenny
- School of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, United Kingdom
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Hua C, Woo S, Rawal A, Tuna F, Hook JM, Collison D, D'Alessandro DM. Redox-State Dependent Spectroscopic Properties of Porous Organic Polymers Containing Furan, Thiophene, and Selenophene. Aust J Chem 2017. [DOI: 10.1071/ch17335] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
A series of electroactive triarylamine porous organic polymers (POPs) with furan, thiophene, and selenophene (POP-O, POP-S, and POP-Se) linkers have been synthesised and their electronic and spectroscopic properties investigated as a function of redox state. Solid state NMR provided insight into the structural features of the POPs, while in situ solid state Vis-NIR and electron paramagnetic resonance spectroelectrochemistry showed that the distinct redox states in POP-S could be reversibly accessed. The development of redox-active porous organic polymers with heterocyclic linkers affords their potential application as stimuli responsive materials in gas storage, catalysis, and as electrochromic materials.
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Hua C, Rizzuto FJ, Zhang X, Tuna F, Collison D, D'Alessandro DM. Spectroelectrochemical properties of a Ru(ii) complex with a thiazolo[5,4-d]thiazole triarylamine ligand. NEW J CHEM 2017. [DOI: 10.1039/c6nj02802k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A new electroactive bridging ligand based on the donor (triarylamine) and acceptor (thiazolothiazole) units has been designed and incorporated into a diruthenium complex.
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Affiliation(s)
- Carol Hua
- School of Chemistry
- The University of Sydney
- New South Wales 2006
- Australia
| | - Felix J. Rizzuto
- School of Chemistry
- The University of Sydney
- New South Wales 2006
- Australia
| | - Xuan Zhang
- School of Chemistry
- The University of Sydney
- New South Wales 2006
- Australia
- School of Chemistry and Chemical Engineering
| | - Floriana Tuna
- School of Chemistry
- University of Manchester
- Manchester M13 9PL
- UK
| | - David Collison
- School of Chemistry
- University of Manchester
- Manchester M13 9PL
- UK
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Hua C, Ge JY, Tuna F, Collison D, Zuo JL, D'Alessandro DM. Redox state manipulation of a tris(p-tetrazolylphenyl)amine ligand and its Mn2+ coordination frameworks. Dalton Trans 2017; 46:2998-3007. [DOI: 10.1039/c6dt04719j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Two new Mn2+-based metal–organic frameworks containing the tris(p-tetrazolylphenyl)amine (H3TTPA) ligand exhibit multiple redox-accessible states which have been interrogated using in situ solid state spectroelectrochemical methods.
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Affiliation(s)
- Carol Hua
- School of Chemistry
- The University of Sydney
- New South Wales 2006
- Australia
| | - Jing-Yuan Ge
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- P. R. China
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute
- The University of Manchester
- Manchester M13 9PL
- UK
| | - David Collison
- School of Chemistry and Photon Science Institute
- The University of Manchester
- Manchester M13 9PL
- UK
| | - Jing-Lin Zuo
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- P. R. China
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40
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Hua C, Abrahams BF, Tuna F, Collison D, D'Alessandro DM. In Situ Spectroelectrochemical Investigations of RuII Complexes with Bispyrazolyl Methane Triarylamine Ligands. Aust J Chem 2017. [DOI: 10.1071/ch16555] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The synthesis and characterization of two triarylamine ligands, 4-(di(1H-pyrazol-1-yl)methyl)-N-(4-(di(1H-pyrazol-1-yl)methyl)phenyl)-N-phenylaniline (TPA-2bpm) and tris(4-(di(1H-pyrazol-1-yl)methyl)phenyl)amine (TPA-3bpm), containing the bispyrazolylmethane moiety and its RuII terpyridine complexes are presented. The redox properties of the ligands and RuII complexes are explored in detail through cyclic and square-wave voltammetry in addition to in situ UV-vis-near infrared, electron paramagnetic resonance, and fluorescence spectroelectrochemistry. It was demonstrated that the triarylamine radical cation was able to be generated, and further, TPA-2bpm underwent an electrochemically induced dimerization process.
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41
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Houton E, Kelly B, Sanz S, McInnes EJL, Collison D, Brechin EK, Barra A, Ryder AG, Jones LF. A Facile Synthetic Route to a Family of Mn
III
Monomers and Their Structural, Magnetic and Spectroscopic Studies. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201601124] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Edel Houton
- School of Chemistry NUI Galway University Road Galway Ireland
| | - Brian Kelly
- School of Chemistry NUI Galway University Road Galway Ireland
| | - Sergio Sanz
- EaStCHEM School of Chemistry University of Edinburgh David Brewster Road Edinburgh Scotland
| | - Eric J. L. McInnes
- School of Chemistry University of Manchester Oxford Road Manchester England UK
| | - David Collison
- School of Chemistry University of Manchester Oxford Road Manchester England UK
| | - Euan K. Brechin
- EaStCHEM School of Chemistry University of Edinburgh David Brewster Road Edinburgh Scotland
| | - Anne‐Laure Barra
- LNCMI‐CNRS Université Grenoble‐Alpes Avenue des Martyrs Grenoble France
| | - Alan G. Ryder
- School of Chemistry NUI Galway University Road Galway Ireland
| | - Leigh F. Jones
- School of Chemistry NUI Galway University Road Galway Ireland
- School of Chemistry Bangor University Alun Roberts Building, Deiniol Road Bangor Wales UK
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42
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Hua C, Baldansuren A, Tuna F, Collison D, D'Alessandro DM. In Situ Spectroelectrochemical Investigations of the Redox-Active Tris[4-(pyridin-4-yl)phenyl]amine Ligand and a Zn(2+) Coordination Framework. Inorg Chem 2016; 55:7270-80. [PMID: 27419690 DOI: 10.1021/acs.inorgchem.6b00981] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An investigation of the redox-active tris[4-(pyridin-4-yl)phenyl]amine (NPy3) ligand in the solution state and upon its incorporation into the solid-state metal-organic framework (MOF) [Zn(NPy3)(NO2)2·xMeOH·xDMF]n (MeOH = methanol and DMF = N,N-dimethylformamide) was conducted using in situ UV/vis/near-IR, electron paramagentic resonance (EPR), and fluorescence spectroelectrochemical experiments. Through this multifaceted approach, the properties of the ligand and framework were elucidated and quantified as a function of the redox state of the triarylamine core, which can undergo a one-electron oxidation to its radical cation. The use of pulsed EPR experiments revealed that the radical generated was highly delocalized throughout the entire ligand backbone. This combination of techniques provides comprehensive insight into electronic delocalization in a framework system and demonstrates the utility of in situ spectroelectrochemical methods in assessing electroactive MOFs.
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Affiliation(s)
- Carol Hua
- School of Chemistry, The University of Sydney , Sydney, New South Wales 2006, Australia
| | - Amgalanbaatar Baldansuren
- School of Chemistry and Photon Science Institute, The University of Manchester , Manchester M13 9PL, United Kingdom
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute, The University of Manchester , Manchester M13 9PL, United Kingdom
| | - David Collison
- School of Chemistry and Photon Science Institute, The University of Manchester , Manchester M13 9PL, United Kingdom
| | - Deanna M D'Alessandro
- School of Chemistry, The University of Sydney , Sydney, New South Wales 2006, Australia
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43
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Abstract
This chapter presents evidence of a relationship between child mortality data and socio-economic factors in relatively wealthy nations. The original study on child mortality that is reported here, which first appeared in a UK medical journal, was undertaken in a school of business by academics with accounting and finance backgrounds. The rationale explaining why academics from such disciplines were drawn to investigate these issues is given in the first part of the chapter. The findings related to child mortality data were identified as a special case of a wide range of social and health indicators that are systematically related to the different organisational approaches of capitalist societies. In particular, the so-called Anglo-American countries show consistently poor outcomes over a number of indicators, including child mortality. Considerable evidence has been adduced in the literature to show the importance of income inequality as an explanation for such findings. An important part of the chapter is the overview of a relatively recent publication in the epidemiological literature entitled The Spirit Level: Why Equality Is Better for Everyone, which was written by Wilkinson and Pickett.
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Affiliation(s)
- David Collison
- Accounting and Finance, School of Business, University of Dundee, Dundee, UK
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44
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Chen B, Lv ZP, Hua C, Leong CF, Tuna F, D'Alessandro DM, Collison D, Zuo JL. Dinuclear Ruthenium Complex Based on a π-Extended Bridging Ligand with Redox-Active Tetrathiafulvalene and 1,10-Phenanthroline Units. Inorg Chem 2016; 55:4606-15. [PMID: 27070295 DOI: 10.1021/acs.inorgchem.6b00437] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis of a π-extended bridging ligand with both redox-active tetrathiafulvalene (TTF) and 1,10-phenanthroline (phen) units, namely, bis(1,10-phenanthro[5,6-b])tetrathiafulvalene (BPTTF), was realized via a self-coupling reaction. Using this ligand and Ru(tbbpy)2Cl2 (tbbpy = 4,4'-di-tert-butyl-2,2'-bipyridine), the dinuclear ruthenium(II) compound [{Ru(tbbpy)2}2(BPTTF)](PF6)4 (1) has been obtained by microwave-assisted synthesis. Structural characterization of 1 revealed a crossed arrangement of the TTF moieties on adjacent dimers within the crystal structure. The optical and redox properties of 1 were investigated using electrochemical, spectroelectrochemical, electron paramagnetic resonance (EPR), and absorption spectroscopic studies combined with theoretical calculations. One exhibits a rich electrochemical behavior owing to the multiple redox-active centers. Interestingly, both the ligand BPTTF and the ruthenium compound 1 are EPR-active in the solid state owing to intramolecular charge-transfer processes. The results demonstrate that the TTF-annulated bis(phen) ligand is a promising bridging ligand to construct oligomeric or polymeric metal complexes with multiple redox-active centers.
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Affiliation(s)
- Bin Chen
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, P. R. China
| | - Zhong-Peng Lv
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, P. R. China
| | - Carol Hua
- School of Chemistry, The University of Sydney , New South Wales 2006, Australia
| | - Chanel F Leong
- School of Chemistry, The University of Sydney , New South Wales 2006, Australia
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute, The University of Manchester , Manchester M13 9PL, United Kingdom
| | | | - David Collison
- School of Chemistry and Photon Science Institute, The University of Manchester , Manchester M13 9PL, United Kingdom
| | - Jing-Lin Zuo
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, P. R. China
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45
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Baker ML, Lancaster T, Chiesa A, Amoretti G, Baker PJ, Barker C, Blundell SJ, Carretta S, Collison D, Güdel HU, Guidi T, McInnes EJL, Möller JS, Mutka H, Ollivier J, Pratt FL, Santini P, Tuna F, Tregenna-Piggott PLW, Vitorica-Yrezabal IJ, Timco GA, Winpenny REP. Studies of a Large Odd-Numbered Odd-Electron Metal Ring: Inelastic Neutron Scattering and Muon Spin Relaxation Spectroscopy of Cr8 Mn. Chemistry 2016; 22:1779-88. [PMID: 26748964 PMCID: PMC4744977 DOI: 10.1002/chem.201503431] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Indexed: 11/05/2022]
Abstract
The spin dynamics of Cr8Mn, a nine‐membered antiferromagnetic (AF) molecular nanomagnet, are investigated. Cr8Mn is a rare example of a large odd‐membered AF ring, and has an odd‐number of 3d‐electrons present. Odd‐membered AF rings are unusual and of interest due to the presence of competing exchange interactions that result in frustrated‐spin ground states. The chemical synthesis and structures of two Cr8Mn variants that differ only in their crystal packing are reported. Evidence of spin frustration is investigated by inelastic neutron scattering (INS) and muon spin relaxation spectroscopy (μSR). From INS studies we accurately determine an appropriate microscopic spin Hamiltonian and we show that μSR is sensitive to the ground‐spin‐state crossing from S=1/2 to S=3/2 in Cr8Mn. The estimated width of the muon asymmetry resonance is consistent with the presence of an avoided crossing. The investigation of the internal spin structure of the ground state, through the analysis of spin‐pair correlations and scalar‐spin chirality, shows a non‐collinear spin structure that fluctuates between non‐planar states of opposite chiralities.
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Affiliation(s)
- Michael L Baker
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK. .,Institut Laue-Langevin, BP 156, 6 rue Jules Horowitz, 38042, Grenoble Cedex 9, France.
| | - Tom Lancaster
- Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK
| | - Alessandro Chiesa
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, 43124, Parma, Italy
| | - Giuseppe Amoretti
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, 43124, Parma, Italy
| | - Peter J Baker
- ISIS Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Claire Barker
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Stephen J Blundell
- Clarendon Laboratory, Department of Physics, University of Oxford, OX1 3PU, UK.
| | - Stefano Carretta
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, 43124, Parma, Italy
| | - David Collison
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Hans U Güdel
- Department of Chemistry and Biochemistry, University of Bern, 3000, Bern, Switzerland
| | - Tatiana Guidi
- ISIS Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Eric J L McInnes
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Johannes S Möller
- Clarendon Laboratory, Department of Physics, University of Oxford, OX1 3PU, UK
| | - Hannu Mutka
- Institut Laue-Langevin, BP 156, 6 rue Jules Horowitz, 38042, Grenoble Cedex 9, France
| | - Jacques Ollivier
- Institut Laue-Langevin, BP 156, 6 rue Jules Horowitz, 38042, Grenoble Cedex 9, France
| | - Francis L Pratt
- ISIS Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Paolo Santini
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, 43124, Parma, Italy
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | | | - Iñigo J Vitorica-Yrezabal
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Grigore A Timco
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Richard E P Winpenny
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
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46
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Gregson M, Chilton NF, Ariciu AM, Tuna F, Crowe IF, Lewis W, Blake AJ, Collison D, McInnes EJL, Winpenny REP, Liddle ST. A monometallic lanthanide bis(methanediide) single molecule magnet with a large energy barrier and complex spin relaxation behaviour. Chem Sci 2016; 7:155-165. [PMID: 29861976 PMCID: PMC5950554 DOI: 10.1039/c5sc03111g] [Citation(s) in RCA: 261] [Impact Index Per Article: 32.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 11/20/2015] [Indexed: 12/23/2022] Open
Abstract
We report a dysprosium(iii) bis(methanediide) single molecule magnet (SMM) where stabilisation of the highly magnetic states and suppression of mixing of opposite magnetic projections is imposed by a linear arrangement of negatively-charged donor atoms supported by weak neutral donors. Treatment of [Ln(BIPMTMS)(BIPMTMSH)] [Ln = Dy, 1Dy; Y, 1Y; BIPMTMS = {C(PPh2NSiMe3)2}2-; BIPMTMSH = {HC(PPh2NSiMe3)2}-] with benzyl potassium/18-crown-6 ether (18C6) in THF afforded [Ln(BIPMTMS)2][K(18C6)(THF)2] [Ln = Dy, 2Dy; Y, 2Y]. AC magnetic measurements of 2Dy in zero DC field show temperature- and frequency-dependent SMM behaviour. Orbach relaxation dominates at high temperature, but at lower temperatures a second-order Raman process dominates. Complex 2Dy exhibits two thermally activated energy barriers (U eff) of 721 and 813 K, the largest U eff values for any monometallic dysprosium(iii) complex. Dilution experiments confirm the molecular origin of this phenomenon. Complex 2Dy has rich magnetic dynamics; field-cooled (FC)/zero-field cooled (ZFC) susceptibility measurements show a clear divergence at 16 K, meaning the magnetic observables are out-of-equilibrium below this temperature, however the maximum in ZFC, which conventionally defines the blocking temperature, T B, is found at 10 K. Magnetic hysteresis is also observed in 10% 2Dy@2Y at these temperatures. Ab initio calculations suggest the lowest three Kramers doublets of the ground 6H15/2 multiplet of 2Dy are essentially pure, well-isolated |±15/2, |±13/2 and |±11/2 states quantised along the C[double bond, length as m-dash]Dy[double bond, length as m-dash]C axis. Thermal relaxation occurs via the 4th and 5th doublets, verified experimentally for the first time, and calculated U eff values of 742 and 810 K compare very well to experimental magnetism and luminescence data. This work validates a design strategy towards realising high-temperature SMMs and produces unusual spin relaxation behaviour where the magnetic observables are out-of-equilibrium some 6 K above the formal blocking temperature.
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Affiliation(s)
- Matthew Gregson
- School of Chemistry , The University of Manchester , Oxford Road , Manchester , M13 9PL , UK . ;
| | - Nicholas F Chilton
- School of Chemistry , The University of Manchester , Oxford Road , Manchester , M13 9PL , UK . ;
| | - Ana-Maria Ariciu
- School of Chemistry and Photon Science Institute , The University of Manchester , Oxford Road , Manchester , M13 9PL , UK
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute , The University of Manchester , Oxford Road , Manchester , M13 9PL , UK
| | - Iain F Crowe
- School of Electrical and Electronic Engineering and Photon Science Institute , The University of Manchester , Oxford Road , Manchester , M13 9PL , UK
| | - William Lewis
- School of Chemistry , University of Nottingham , University Park , Nottingham , NG7 2RD , UK
| | - Alexander J Blake
- School of Chemistry , University of Nottingham , University Park , Nottingham , NG7 2RD , UK
| | - David Collison
- School of Chemistry , The University of Manchester , Oxford Road , Manchester , M13 9PL , UK . ;
| | - Eric J L McInnes
- School of Chemistry and Photon Science Institute , The University of Manchester , Oxford Road , Manchester , M13 9PL , UK
| | - Richard E P Winpenny
- School of Chemistry , The University of Manchester , Oxford Road , Manchester , M13 9PL , UK . ;
| | - Stephen T Liddle
- School of Chemistry , The University of Manchester , Oxford Road , Manchester , M13 9PL , UK . ;
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47
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Walsh JPS, Meadows SB, Ghirri A, Moro F, Jennings M, Smith WF, Graham DM, Kihara T, Nojiri H, Vitorica-Yrezabal IJ, Timco GA, Collison D, McInnes EJL, Winpenny REP. Electronic Structure of a Mixed-Metal Fluoride-Centered Triangle Complex: A Potential Qubit Component. Inorg Chem 2015; 54:12019-26. [PMID: 26636473 DOI: 10.1021/acs.inorgchem.5b01898] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel fluoride-centered triangular-bridged carboxylate complex, [Ni2Cr(μ3-F)(O2C(t)Bu)6(HO2C(t)Bu)3] (1), is reported. Simple postsynthetic substitution of the terminal pivalic acids in 1 with pyridine and 4-methylpyridine led to the isolation of [Ni2Cr(μ3-F)(O2C(t)Bu)6(C5H5N)3] (2) and [Ni2Cr(μ3-F)(O2C(t)Bu)6((4-CH3)C5H4N)3] (3). Structural and magnetic characterizations carried out on the series reveal a dominating antiferromagnetic interaction between the nickel and chromium centers leading to an S = (1)/2 ground state with a very unusual value of geff = 2.48.
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Affiliation(s)
- James P S Walsh
- School of Chemistry and Photon Science Institute, The University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Sarah B Meadows
- School of Chemistry and Photon Science Institute, The University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Alberto Ghirri
- S3 Centre, Institute Nanoscience (CNR) , via G. Campi 213/A, 41125 Modena, Italy
| | - Fabrizio Moro
- School of Chemistry and Photon Science Institute, The University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Martin Jennings
- School of Chemistry and Photon Science Institute, The University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - William F Smith
- School of Physics and Astronomy and Photon Science Institute, The University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Darren M Graham
- School of Physics and Astronomy and Photon Science Institute, The University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Takumi Kihara
- Institute for Materials Research, Tohoku University , Katahira, Sendai 980-8577, Japan
| | - Hiroyuki Nojiri
- Institute for Materials Research, Tohoku University , Katahira, Sendai 980-8577, Japan
| | - Iñigo J Vitorica-Yrezabal
- School of Chemistry and Photon Science Institute, The University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Grigore A Timco
- School of Chemistry and Photon Science Institute, The University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - David Collison
- School of Chemistry and Photon Science Institute, The University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Eric J L McInnes
- School of Chemistry and Photon Science Institute, The University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Richard E P Winpenny
- School of Chemistry and Photon Science Institute, The University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
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48
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McClelland S, Hennessey B, Fitzpatrick N, Collison D, Giblin G, Hussein H, Salim T, Foley D, McAdam BF. 18 Transoesophageal echo in the investigation of cryptogenic stroke and transient ischaemic attack – diagnostic yield and impact on clinical management. Heart 2015. [DOI: 10.1136/heartjnl-2015-308621.18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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49
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Hughes D, Salim TS, Hennessy B, Collison D, Giblan G, McClelland S, Fitzpatrick N, Hussain H, McAdam BF. 11 Investigating the effectiveness of 1, 3 and 5 day holter monitoring: should it be limited to 24 h. Heart 2015. [DOI: 10.1136/heartjnl-2015-308621.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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50
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Giblin G, Sharma N, McClelland S, Hennessy B, Collison D, Fitzpatrick N, Salim T, Hussein H, McAdam BF. 2 Incidental coronary artery calcification detection on non-cardiac CT. Heart 2015. [DOI: 10.1136/heartjnl-2015-308621.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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