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Genoux A, Pauly M, Rooney CL, Choi C, Shang B, McGuigan S, Fataftah MS, Kayser Y, Suhr SCB, DeBeer S, Wang H, Maggard PA, Holland PL. Well-Defined Iron Sites in Crystalline Carbon Nitride. J Am Chem Soc 2023; 145:20739-20744. [PMID: 37703184 DOI: 10.1021/jacs.3c05417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/15/2023]
Abstract
Carbon nitride materials can be hosts for transition metal sites, but Mössbauer studies on iron complexes in carbon nitrides have always shown a mixture of environments and oxidation states. Here we describe the synthesis and characterization of a crystalline carbon nitride with stoichiometric iron sites that all have the same environment. The material (formula C6N9H2Fe0.4Li1.2Cl, abbreviated PTI/FeCl2) is derived from reacting poly(triazine imide)·LiCl (PTI/LiCl) with a low-melting FeCl2/KCl flux, followed by anaerobic rinsing with methanol. X-ray diffraction, X-ray absorption and Mössbauer spectroscopies, and SQUID magnetometry indicate that there are tetrahedral high-spin iron(II) sites throughout the material, all having the same geometry. The material is active for electrocatalytic nitrate reduction to ammonia, with a production rate of ca. 0.1 mmol cm-2 h-1 and Faradaic efficiency of ca. 80% at -0.80 V vs RHE.
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Affiliation(s)
- Alexandre Genoux
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Magnus Pauly
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Conor L Rooney
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Chungseok Choi
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Bo Shang
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Scott McGuigan
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Majed S Fataftah
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Yves Kayser
- Max Planck Institute for Chemical Energy Conversion, D-45470 Mülheim an der Ruhr, Germany
| | - Simon C B Suhr
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, D-45470 Mülheim an der Ruhr, Germany
| | - Hailiang Wang
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Paul A Maggard
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Patrick L Holland
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
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2
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Corrigan PS, Majer SH, Silakov A. Evidence of Atypical Structural Flexibility of the Active Site Surrounding of an [FeFe] Hydrogenase from Clostridium beijerinkii. J Am Chem Soc 2023; 145:11033-11044. [PMID: 37163727 DOI: 10.1021/jacs.2c13458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
[FeFe] hydrogenase from Clostridium beijerinkii (CbHydA1) is an unusual hydrogenase in that it can withstand prolonged exposure to O2 by reversibly converting into an O2-protected, inactive state (Hinact). It has been indicated in the past that an atypical conformation of the "SC367CP" loop near the [2Fe]H portion of the six-iron active site (H-cluster) allows the Cys367 residue to adopt an "off-H+-pathway" orientation, promoting a facile transition of the cofactor to Hinact. Here, we investigated the electronic structure of the H-cluster in the oxidized state (Hox) that directly converts to Hinact under oxidizing conditions and the related CO-inhibited state (Hox-CO). We demonstrate that both states exhibit two distinct forms in electron paramagnetic resonance (EPR) spectroscopy. The ratio between the two forms is pH-dependent but also sensitive to the buffer choice. Our IR and EPR analyses illustrate that the spectral heterogeneity is due to a perturbation of the coordination environment of the H-cluster's [4Fe4S]H subcluster without affecting the [2Fe]H subcluster. Overall, we conclude that the observation of two spectral components per state is evidence of heterogeneity of the environment of the H-cluster likely associated with conformational mobility of the SCCP loop. Such flexibility may allow Cys367 to switch rapidly between off- and on-H+-pathway rotamers. Consequently, we believe such structural mobility may be the key to maintaining high enzymatic activity while allowing a facile transition to the O2-protected state.
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Affiliation(s)
- Patrick S Corrigan
- Pennsylvania State University, 104 Chemistry Building, University Park, Pennsylvania 16802, United States
| | - Sean H Majer
- Pennsylvania State University, 104 Chemistry Building, University Park, Pennsylvania 16802, United States
| | - Alexey Silakov
- Pennsylvania State University, 104 Chemistry Building, University Park, Pennsylvania 16802, United States
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3
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Titova YY. Dynamic EPR Studies of the Formation of Catalytically Active Centres in Multicomponent Hydrogenation Systems. Catalysts 2023. [DOI: 10.3390/catal13040653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023] Open
Abstract
The formation of catalytically active nano-sized cobalt-containing structures in multicomponent hydrogenation systems based on Co(acac)2 complex and various cocatalysts, namely, AlEt3, AlEt2(OEt), Li-n-Bu, and (PhCH2)MgCl, has been studied for the first time in detail using dynamic EPR spectroscopy. It is shown that after mixing the initial components, paramagnetic structures are formed, which include a fragment containing Co(0) with the electronic configuration 3d9, as well as a fragment bearing an aluminium, lithium, or magnesium atom, depending on the nature of the used cocatalyst. Such bimetallic paramagnetic sites are stabilized by acetylacetonate ligands. In addition, the paramagnetic complex contains the arene molecule(s), and the cobalt atom is bonded with the atom of the corresponding non-transition through the alkyl group of the co-catalyst, in particular through the carbon atom in the α-position with respect to the atom of the non-transition element. Due to the high reactivity of the described intermediates, they, under the conditions of hydrogenation catalysis, are transformed into nano-sized cobalt-containing structures that act as carriers of the catalytically active sites. Furthermore, because of the high reactivity and paramagnetism, such intermediates can be detected only by the EPR technique. The paper describes the whole experimental way of interpreting the EPR signals corresponding to the intermediates, precursors of catalytically active structures. In addition, a possible mathematical model based on the obtained experimental EPR data is presented.
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4
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Dzyhovskyi V, Stokowa-Sołtys K. Divalent metal ion binding to Staphylococcus aureus FeoB transporter regions. J Inorg Biochem 2023; 244:112203. [PMID: 37018851 DOI: 10.1016/j.jinorgbio.2023.112203] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 03/21/2023] [Accepted: 03/27/2023] [Indexed: 03/31/2023]
Abstract
Transition metal ions such as iron, copper, zinc, manganese or, nickel are essential in many biological processes. Bacteria have developed a number of mechanisms for their acquisition and transport, in which numerous of proteins and smaller molecules are involved. One of the representatives of these proteins is FeoB, which belongs to the Feo (ferrous ion transporter) family. Although ferrous iron transport system is widespread among microorganisms, it is still poorly described in Gram-positive pathogens, such as Staphylococcus aureus. In this work, combined potentiometric and spectroscopic studies (UV-Vis, CD and EPR) were carried out to determine Cu(II), Fe(II) and Zn(II) binding modes to FeoB fragments (Ac-IDYHKLMK-NH2, Ac-ETSHDKY-NH2, and Ac-SFLHMVGS-NH2). For the first time iron(II) complexes with peptides were characterized by potentiometry. All studied ligands are able to form a variety of thermodynamically stable complexes with transition metal ions. It was concluded that among the studied systems, the most effective metal ion binding is observed for the Ac-ETSHDKY-NH2 peptide. Moreover, comparing preferences of all ligands towards different metal ions, copper(II) complexes are the most stable ones at physiological pH.
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5
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Garg NK, Goriya Y, Seetharaman M, Muratović S, Pajić D, Cetina M, Petreska I, Krupskaya Y, Kataev V, Johnson MT, Wendt OF, Žilić D. Mononuclear Iron(III) Complex with Unusual Temperature Change of Color and Magneto-Structural Properties: Synthesis, Structure, Magnetization, Multi-frequency ESR and DFT Study. Dalton Trans 2022; 51:2338-2345. [DOI: 10.1039/d1dt03751j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
From the reaction of 2-hydroxy-6-methylpyridine (L) with iron(II) tetrafluoroborate, a new mononuclear iron(III) octahedral complex [FeL6](BF4)3 has been isolated. The color of the complex is reversible changing from red at...
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6
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Stoian SA, Moshari M, Ferentinos E, Grigoropoulos A, Krzystek J, Telser J, Kyritsis P. Electronic Structure of Tetrahedral, S = 2, [Fe{(EP iPr 2) 2N} 2], E = S, Se, Complexes: Investigation by High-Frequency and -Field Electron Paramagnetic Resonance, 57Fe Mössbauer Spectroscopy, and Quantum Chemical Studies. Inorg Chem 2021; 60:10990-11005. [PMID: 34288665 DOI: 10.1021/acs.inorgchem.1c00670] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this work, we assessed the electronic structures of two pseudotetrahedral complexes of FeII, [Fe{(SPiPr2)2N}2] (1) and [Fe{(SePiPr2)2N}2] (2), using high-frequency and -field EPR (HFEPR) and field-dependent 57Fe Mössbauer spectroscopies. This investigation revealed S = 2 ground states characterized by moderate, negative zero-field splitting (zfs) parameters D. The crystal-field (CF) theory analysis of the spin Hamiltonian (sH) and hyperfine structure parameters revealed that the orbital ground states of 1 and 2 have a predominant dx2-y2 character, which is admixed with dz2 (∼10%). Although replacing the S-containing ligands of 1 by their Se-containing analogues in 2 leads to a smaller |D| value, our theoretical analysis, which relied on extensive ab initio CASSCF calculations, suggests that the ligand spin-orbit coupling (SOC) plays a marginal role in determining the magnetic anisotropy of these compounds. Instead, the dx2-y2β → dxyβ excitations yield a large negative contribution, which dominates the zfs of both 1 and 2, while the different energies of the dx2-y2β → dxzβ transitions are the predominant factor responsible for the difference in zfs between 1 and 2. The electronic structures of these compounds are contrasted with those of other [FeS4] sites, including reduced rubredoxin by considering a D2-type distortion of the [Fe(E-X)4] cores, where E = S, Se; X = C, P. Our combined CASSCF/DFT calculations indicate that while the character of the orbital ground state and the quintet excited states' contribution to the zfs of 1 and 2 are modulated by the magnitude of the D2 distortion, this structural change does not impact the contribution of the excited triplet states.
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Affiliation(s)
- Sebastian A Stoian
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844, United States
| | - Mahsa Moshari
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844, United States
| | - Eleftherios Ferentinos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15771 Athens, Greece
| | - Alexios Grigoropoulos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15771 Athens, Greece
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Joshua Telser
- Department of Biological, Physical, and Health Sciences, Roosevelt University, Chicago, Illinois 60605, United States
| | - Panayotis Kyritsis
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15771 Athens, Greece
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7
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Cirulli M, Salvadori E, Zhang Z, Dommett M, Tuna F, Bamberger H, Lewis JEM, Kaur A, Tizzard GJ, van Slageren J, Crespo‐Otero R, Goldup SM, Roessler MM. Rotaxane Co II Complexes as Field-Induced Single-Ion Magnets. Angew Chem Int Ed Engl 2021; 60:16051-16058. [PMID: 33901329 PMCID: PMC8361961 DOI: 10.1002/anie.202103596] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Indexed: 12/02/2022]
Abstract
Mechanically chelating ligands have untapped potential for the engineering of metal ion properties. Here we demonstrate this principle in the context of CoII -based single-ion magnets. Using multi-frequency EPR, susceptibility and magnetization measurements we found that these complexes show some of the highest zero field splittings reported for five-coordinate CoII complexes to date. The predictable coordination behaviour of the interlocked ligands allowed the magnetic properties of their CoII complexes to be evaluated computationally a priori and our combined experimental and theoretical approach enabled us to rationalize the observed trends. The predictable magnetic behaviour of the rotaxane CoII complexes demonstrates that interlocked ligands offer a new strategy to design metal complexes with interesting functionality.
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Affiliation(s)
- Martina Cirulli
- School of Biological and Chemical SciencesQueen Mary University of LondonMile End RoadLondonE1 4NSUK
| | - Enrico Salvadori
- School of Biological and Chemical SciencesQueen Mary University of LondonMile End RoadLondonE1 4NSUK
- Department of ChemistryUniversity of TorinoVia Giuria 710125TorinoItaly
| | - Zhi‐Hui Zhang
- ChemistryUniversity of SouthamptonHighfieldSO 17 1BJUK
| | - Michael Dommett
- School of Biological and Chemical SciencesQueen Mary University of LondonMile End RoadLondonE1 4NSUK
| | - Floriana Tuna
- Department of Chemistry and Photon Science InstituteUniversity of ManchesterOxford RoadManchesterM13 0PLUK
| | - Heiko Bamberger
- Institut für Physikalische ChemieUniversität StuttgartPfaffenwaldring 5570569StuttgartGermany
| | - James E. M. Lewis
- ChemistryUniversity of SouthamptonHighfieldSO 17 1BJUK
- Department of ChemistryImperial College LondonMolecular Sciences Research HubWood LaneLondonW12 0BZUK
| | | | - Graham J. Tizzard
- EPSRC National Crystallographic ServiceUniversity of SouthamptonHighfieldSouthamptonSO17 1BJUK
| | - Joris van Slageren
- Institut für Physikalische ChemieUniversität StuttgartPfaffenwaldring 5570569StuttgartGermany
| | - Rachel Crespo‐Otero
- School of Biological and Chemical SciencesQueen Mary University of LondonMile End RoadLondonE1 4NSUK
| | | | - Maxie M. Roessler
- School of Biological and Chemical SciencesQueen Mary University of LondonMile End RoadLondonE1 4NSUK
- Department of ChemistryImperial College LondonMolecular Sciences Research HubWood LaneLondonW12 0BZUK
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8
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Cirulli M, Salvadori E, Zhang Z, Dommett M, Tuna F, Bamberger H, Lewis JEM, Kaur A, Tizzard GJ, Slageren J, Crespo‐Otero R, Goldup SM, Roessler MM. Rotaxane Co
II
Complexes as Field‐Induced Single‐Ion Magnets. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202103596] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Martina Cirulli
- School of Biological and Chemical Sciences Queen Mary University of London Mile End Road London E1 4NS UK
| | - Enrico Salvadori
- School of Biological and Chemical Sciences Queen Mary University of London Mile End Road London E1 4NS UK
- Department of Chemistry University of Torino Via Giuria 7 10125 Torino Italy
| | - Zhi‐Hui Zhang
- Chemistry University of Southampton Highfield SO 17 1BJ UK
| | - Michael Dommett
- School of Biological and Chemical Sciences Queen Mary University of London Mile End Road London E1 4NS UK
| | - Floriana Tuna
- Department of Chemistry and Photon Science Institute University of Manchester Oxford Road Manchester M13 0PL UK
| | - Heiko Bamberger
- Institut für Physikalische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
| | - James E. M. Lewis
- Chemistry University of Southampton Highfield SO 17 1BJ UK
- Department of Chemistry Imperial College London Molecular Sciences Research Hub Wood Lane London W12 0BZ UK
| | - Amanpreet Kaur
- Chemistry University of Southampton Highfield SO 17 1BJ UK
| | - Graham J. Tizzard
- EPSRC National Crystallographic Service University of Southampton Highfield Southampton SO17 1BJ UK
| | - Joris Slageren
- Institut für Physikalische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Rachel Crespo‐Otero
- School of Biological and Chemical Sciences Queen Mary University of London Mile End Road London E1 4NS UK
| | | | - Maxie M. Roessler
- School of Biological and Chemical Sciences Queen Mary University of London Mile End Road London E1 4NS UK
- Department of Chemistry Imperial College London Molecular Sciences Research Hub Wood Lane London W12 0BZ UK
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9
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Yu CJ, von Kugelgen S, Laorenza DW, Freedman DE. A Molecular Approach to Quantum Sensing. ACS CENTRAL SCIENCE 2021; 7:712-723. [PMID: 34079892 PMCID: PMC8161477 DOI: 10.1021/acscentsci.0c00737] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Indexed: 06/09/2023]
Abstract
The second quantum revolution hinges on the creation of materials that unite atomic structural precision with electronic and structural tunability. A molecular approach to quantum information science (QIS) promises to enable the bottom-up creation of quantum systems. Within the broad reach of QIS, which spans fields ranging from quantum computation to quantum communication, we will focus on quantum sensing. Quantum sensing harnesses quantum control to interrogate the world around us. A broadly applicable class of quantum sensors would feature adaptable environmental compatibility, control over distance from the target analyte, and a tunable energy range of interaction. Molecules enable customizable "designer" quantum sensors with tunable functionality and compatibility across a range of environments. These capabilities offer the potential to bring unmatched sensitivity and spatial resolution to address a wide range of sensing tasks from the characterization of dynamic biological processes to the detection of emergent phenomena in condensed matter. In this Outlook, we outline the concepts and design criteria central to quantum sensors and look toward the next generation of designer quantum sensors based on new classes of molecular sensors.
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10
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Sarkar A, Dey S, Rajaraman G. Role of Coordination Number and Geometry in Controlling the Magnetic Anisotropy in Fe II , Co II , and Ni II Single-Ion Magnets. Chemistry 2020; 26:14036-14058. [PMID: 32729641 DOI: 10.1002/chem.202003211] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Indexed: 12/22/2022]
Abstract
Since the last decade, the focus in the area of single-molecule magnets (SMMs) has been shifting constructively towards the development of single-ion magnets (SIMs) based on transition metals and lanthanides. Although ground-breaking results have been witnessed for DyIII -based SIMs, significant results have also been obtained for some mononuclear transition metal SIMs. Among others, studies based on CoII ion are very prominent as they often exhibit high magnetic anisotropy or zero-field splitting parameters and offer a large barrier height for magnetisation reversal. Although CoII possibly holds the record for having the largest number of zero-field SIMs known for any transition metal ion, controlling the magnetic anisotropy in these systems are is still a challenge. In addition to the modern spectroscopic techniques, theoretical studies, especially ab initio CASSCF/NEVPT2 approaches, have been used to uncover the electronic structure of various CoII SIMs. In this article, with some selected examples, the aim is to showcase how varying the coordination number from two to eight, and the geometry around the CoII centre alters the magnetic anisotropy. This offers some design principles for the experimentalists to target new generation SIMs based on the CoII ion. Additionally, some important FeII /FeIII and NiII complexes exhibiting large magnetic anisotropy and SIM properties are also discussed.
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Affiliation(s)
- Arup Sarkar
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Sourav Dey
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India
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11
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Kawamura A, Xie J, Boyn JN, Jesse KA, McNeece AJ, Hill EA, Collins KA, Valdez-Moreira JA, Filatov AS, Kurutz JW, Mazziotti DA, Anderson JS. Reversible Switching of Organic Diradical Character via Iron-Based Spin-Crossover. J Am Chem Soc 2020; 142:17670-17680. [PMID: 32948091 DOI: 10.1021/jacs.0c08307] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Airi Kawamura
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Jiaze Xie
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Jan-Niklas Boyn
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Kate A. Jesse
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Andrew J. McNeece
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Ethan A. Hill
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Kelsey A. Collins
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | | | - Alexander S. Filatov
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Josh W. Kurutz
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - David A. Mazziotti
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - John S. Anderson
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
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12
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Konarev DV, Kuzmin AV, Batov MS, Khasanov SS, Otsuka A, Yamochi H, Kitagawa H, Lyubovskaya RN. Strong magnetic coupling of spins in Fe(ii) dimers with differently charged thioindigo ligands. Dalton Trans 2020; 49:7692-7696. [PMID: 32495783 DOI: 10.1039/d0dt01262a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A first coordination {[2.2.2]cryptand(K+)}2{FeII(TI˙-)(TI2-)}2·2C6H4Cl2 (1) complex of iron(ii) containing radical anions and dianions of thioindigo (TI) was obtained. The complex has two high-spin FeII centers bound by two oxygen atoms, and the TI˙- radical anions are coordinated to each FeII. As a result, the 4-spin system consisting of TI˙- (S = 1/2)-FeII (S = 2)-FeII (S = 2)-TI˙- (S = 1/2) coupled spins is formed within a dimer with strong FeII-FeII (J = -51.1 cm-1) and weaker FeII-TI˙- interactions of (J = -35.4 cm-1).
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Affiliation(s)
- Dmitri V Konarev
- Institute of Problems of Chemical Physics RAS, Chernogolovka, Moscow region 142432, Russia.
| | - Alexey V Kuzmin
- Institute of Solid State Physics RAS, Chernogolovka, Moscow region 142432, Russia
| | - Mikhail S Batov
- Institute of Problems of Chemical Physics RAS, Chernogolovka, Moscow region 142432, Russia. and M. V. Lomonosov Moscow State University, Leninskie Gory, Moscow, 119991, Russia
| | - Salavat S Khasanov
- Institute of Solid State Physics RAS, Chernogolovka, Moscow region 142432, Russia
| | - Akihiro Otsuka
- Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan and Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hideki Yamochi
- Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan and Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hiroshi Kitagawa
- Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Rimma N Lyubovskaya
- Institute of Problems of Chemical Physics RAS, Chernogolovka, Moscow region 142432, Russia.
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13
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Shin JW, Jeong AR, Jeong JH, Zenno H, Hayami S, Min KS. Two-dimensional square-grid iron(ii) coordination polymers showing anion-dependent spin crossover behavior. RSC Adv 2020; 10:5040-5049. [PMID: 35498313 PMCID: PMC9049044 DOI: 10.1039/c9ra09782a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 01/24/2020] [Indexed: 11/21/2022] Open
Abstract
Two Fe(ii)-based coordination polymers [Fe(tpmd)2(NCS)2]·5.5H2O (1) and [Fe(tpmd)2(NCSe)2]·7H2O (2) with the framework of square-grid type have been assembled from FeSO4·7H2O, N,N,N′,N′-tetrakis(pyridin-4-yl)methanediamine (tpmd), and KNCS/KNCSe in methanol and characterized. By utilizing two pyridine groups of a tpmd ligand, 1 and 2 are formed in two-dimensional layered structures through coordination of octahedral iron(ii) ions with the tpmd to NCS−/NCSe− ligands in which they have a supramolecular isomorphous conformation. 1 shows a paramagnetic behavior between 2 and 300 K, while 2 exhibits two-step spin crossover (ca. 145 and 50 K) in the temperature range due to the coordination of NCSe− ligands. At 300 K 2 is fully high-spin state. However, at 100 K 2 becomes ca. 50% high spin and 50% low spin iron(ii) ions, which is verified by magnetic moments. In the structural analysis of 2 at 100 K, two different layers are observed with different bond distances around iron(ii) ions in which the layers are stacked alternately. Two-dimensional Fe-based coordination polymers with square-grid shapes were prepared by self-assembly and exhibited an interesting spin crossover behavior depending on the coordinated counter ions.![]()
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Affiliation(s)
- Jong Won Shin
- Department of Chemistry
- Kyungpook National University
- Daegu 41566
- Republic of Korea
| | - Ah Rim Jeong
- Department of Chemistry
- Kyungpook National University
- Daegu 41566
- Republic of Korea
| | - Jong Hwa Jeong
- Department of Chemistry
- Kyungpook National University
- Daegu 41566
- Republic of Korea
| | - Hikaru Zenno
- Department of Chemistry
- Kumamoto University
- Kumamoto 860-8555
- Japan
| | - Shinya Hayami
- Department of Chemistry
- Kumamoto University
- Kumamoto 860-8555
- Japan
| | - Kil Sik Min
- Department of Chemistry Education
- Kyungpook National University
- Daegu 41566
- Republic of Korea
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14
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Fataftah MS, Freedman DE. Progress towards creating optically addressable molecular qubits. Chem Commun (Camb) 2018; 54:13773-13781. [PMID: 30468437 DOI: 10.1039/c8cc07939k] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The emerging field of quantum information science promises to transform a diverse range of scientific fields, ranging from computation to sensing and metrology. The interdisciplinary scientific community laid the groundwork for the next generation of quantum technologies through key advances in understanding the fundamental unit of quantum information science, the qubit. Electronic spin is a promising platform for qubits, demonstrating suitably long coherence times, optical initialization, and single spin addressability. Herein, we discuss recent accomplishments and future progress from our group targeted at imbuing transition metal complexes with the aforementioned properties, creating a pathway to fusing spatial precision with long coherence times. A strong emphasis of this feature article is progressing towards single spin measurements via a chemical approach for imbuing molecular qubits with an optically-induced spin polarization mechanism.
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Affiliation(s)
- Majed S Fataftah
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
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15
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Effect of Low Spin Excited States for Magnetic Anisotropy of Transition Metal Mononuclear Single Molecule Magnets. INORGANICS 2018. [DOI: 10.3390/inorganics6010024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Rational, fine tuning of magnetic anisotropy is critical to obtain new coordination compounds with enhanced single molecule magnet properties. For mononuclear transition metal complexes, the largest contribution to zero-field splitting is usually related to the excited states of the same spin as the ground level. Thus, the contribution of lower multiplicity roots tends to be overlooked due to its lower magnitude. In this article, we explore the role of lower multiplicity excited states in zero-field splitting parameters in model structures of Fe(II) and Co(II). Model aquo complexes with coordination numbers ranging from 2 to 6 were constructed. The magnetic anisotropy was calculated by state of the art ab initio methodologies, including spin-orbit coupling effects. For non-degenerate ground states, contributions to the zero-field splitting parameter (D) from highest and lower multiplicity roots were of the same sign. In addition, their relative magnitude was in a relatively narrow range, irrespective of the coordination geometry. For degenerate ground states, the contribution from lower multiplicity roots was significantly smaller. Results are rationalized in terms of general expressions for D and are expected to be reasonably transferable to real molecular systems.
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16
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Sarkar A, Velmurugan G, Rajeshkumar T, Rajaraman G. Deciphering the origin of invariance in magnetic anisotropy in {FeIIS4} complexes: a theoretical perspective. Dalton Trans 2018; 47:9980-9984. [DOI: 10.1039/c8dt02145g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
By employing the state-of-the-art ab initio calculations, we have probed the origin of invariance in ZFS parameters in {FeIIS4} complexes.
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Affiliation(s)
- Arup Sarkar
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai
- India
| | | | | | - Gopalan Rajaraman
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai
- India
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17
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Zheng XY, Zhang H, Wang Z, Liu P, Du MH, Han YZ, Wei RJ, Ouyang ZW, Kong XJ, Zhuang GL, Long LS, Zheng LS. Insights into Magnetic Interactions in a Monodisperse Gd12Fe14Metal Cluster. Angew Chem Int Ed Engl 2017; 56:11475-11479. [DOI: 10.1002/anie.201705697] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 07/08/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Xiu-Ying Zheng
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Hui Zhang
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Zhenxing Wang
- Wuhan National High Magnetic Field Center & School of Physics; Huazhong University of Science and Technology; Wuhan 430074 China
| | - Pengxin Liu
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Ming-Hao Du
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Ying-Zi Han
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Rong-Jia Wei
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Zhong-Wen Ouyang
- Wuhan National High Magnetic Field Center & School of Physics; Huazhong University of Science and Technology; Wuhan 430074 China
| | - Xiang-Jian Kong
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Gui-Lin Zhuang
- College of Chemcal Engineering; Zhejiang University of Technology; Hangzhou 310032 China
| | - La-Sheng Long
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Lan-Sun Zheng
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
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18
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Zheng XY, Zhang H, Wang Z, Liu P, Du MH, Han YZ, Wei RJ, Ouyang ZW, Kong XJ, Zhuang GL, Long LS, Zheng LS. Insights into Magnetic Interactions in a Monodisperse Gd12Fe14Metal Cluster. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201705697] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xiu-Ying Zheng
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Hui Zhang
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Zhenxing Wang
- Wuhan National High Magnetic Field Center & School of Physics; Huazhong University of Science and Technology; Wuhan 430074 China
| | - Pengxin Liu
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Ming-Hao Du
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Ying-Zi Han
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Rong-Jia Wei
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Zhong-Wen Ouyang
- Wuhan National High Magnetic Field Center & School of Physics; Huazhong University of Science and Technology; Wuhan 430074 China
| | - Xiang-Jian Kong
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Gui-Lin Zhuang
- College of Chemcal Engineering; Zhejiang University of Technology; Hangzhou 310032 China
| | - La-Sheng Long
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Lan-Sun Zheng
- Collaborative Innovation Center of Chemistry for Energy Materials; State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
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19
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Escalera-Moreno L, Suaud N, Gaita-Ariño A, Coronado E. Determining Key Local Vibrations in the Relaxation of Molecular Spin Qubits and Single-Molecule Magnets. J Phys Chem Lett 2017; 8:1695-1700. [PMID: 28350165 DOI: 10.1021/acs.jpclett.7b00479] [Citation(s) in RCA: 108] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
To design molecular spin qubits and nanomagnets operating at high temperatures, there is an urgent need to understand the relationship between vibrations and spin relaxation processes. Herein we develop a simple first-principles methodology to determine the modulation that vibrations exert on spin energy levels. This methodology is applied to [Cu(mnt)2]2- (mnt2- = 1,2-dicyanoethylene-1,2-dithiolate), a highly coherent complex. By theoretically identifying the most relevant vibrational modes, we are able to offer general strategies to chemically design more resilient magnetic molecules, where the energy of the spin states is not coupled to vibrations.
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Affiliation(s)
- L Escalera-Moreno
- UIMM-ICMol, University of Valencia , c/José Beltrán 2, 46980 Paterna, Spain
| | - N Suaud
- LCPQ-IRSAMC, Université de Toulouse , 118 route de Narbonne, 31062 Toulouse, France
| | - A Gaita-Ariño
- UIMM-ICMol, University of Valencia , c/José Beltrán 2, 46980 Paterna, Spain
| | - E Coronado
- UIMM-ICMol, University of Valencia , c/José Beltrán 2, 46980 Paterna, Spain
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20
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Chen L, Cui HH, Stavretis SE, Hunter SC, Zhang YQ, Chen XT, Sun YC, Wang Z, Song Y, Podlesnyak AA, Ouyang ZW, Xue ZL. Slow Magnetic Relaxations in Cobalt(II) Tetranitrate Complexes. Studies of Magnetic Anisotropy by Inelastic Neutron Scattering and High-Frequency and High-Field EPR Spectroscopy. Inorg Chem 2016; 55:12603-12617. [PMID: 27989182 DOI: 10.1021/acs.inorgchem.6b01544] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Three mononuclear cobalt(II) tetranitrate complexes (A)2[Co(NO3)4] with different countercations, Ph4P+ (1), MePh3P+ (2), and Ph4As+ (3), have been synthesized and studied by X-ray single-crystal diffraction, magnetic measurements, inelastic neutron scattering (INS), high-frequency and high-field EPR (HF-EPR) spectroscopy, and theoretical calculations. The X-ray diffraction studies reveal that the structure of the tetranitrate cobalt anion varies with the countercation. 1 and 2 exhibit highly irregular seven-coordinate geometries, while the central Co(II) ion of 3 is in a distorted-dodecahedral configuration. The sole magnetic transition observed in the INS spectroscopy of 1-3 corresponds to the zero-field splitting (2(D2 + 3E2)1/2) from 22.5(2) cm-1 in 1 to 26.6(3) cm-1 in 2 and 11.1(5) cm-1 in 3. The positive sign of the D value, and hence the easy-plane magnetic anisotropy, was demonstrated for 1 by INS studies under magnetic fields and HF-EPR spectroscopy. The combined analyses of INS and HF-EPR data yield the D values as +10.90(3), +12.74(3), and +4.50(3) cm-1 for 1-3, respectively. Frequency- and temperature-dependent alternating-current magnetic susceptibility measurements reveal the slow magnetization relaxation in 1 and 2 at an applied dc field of 600 Oe, which is a characteristic of field-induced single-molecule magnets (SMMs). The electronic structures and the origin of magnetic anisotropy of 1-3 were revealed by calculations at the CASPT2/NEVPT2 level.
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Affiliation(s)
- Lei Chen
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210023, People's Republic of China
| | - Hui-Hui Cui
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210023, People's Republic of China
| | - Shelby E Stavretis
- Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Seth C Hunter
- Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Yi-Quan Zhang
- Jiangsu Key Laboratory for NSLSCS, School of Physical Science and Technology, Nanjing Normal University , Nanjing 210023, People's Republic of China
| | - Xue-Tai Chen
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210023, People's Republic of China
| | - Yi-Chen Sun
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology , Wuhan 430074, People's Republic of China
| | - Zhenxing Wang
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology , Wuhan 430074, People's Republic of China
| | - You Song
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210023, People's Republic of China
| | - Andrey A Podlesnyak
- Quantum Condensed Matter Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Zhong-Wen Ouyang
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology , Wuhan 430074, People's Republic of China
| | - Zi-Ling Xue
- Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States
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21
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Yu CJ, Graham MJ, Zadrozny JM, Niklas J, Krzyaniak MD, Wasielewski MR, Poluektov OG, Freedman DE. Long Coherence Times in Nuclear Spin-Free Vanadyl Qubits. J Am Chem Soc 2016; 138:14678-14685. [PMID: 27797487 DOI: 10.1021/jacs.6b08467] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Quantum information processing (QIP) offers the potential to create new frontiers in fields ranging from quantum biology to cryptography. Two key figures of merit for electronic spin qubits, the smallest units of QIP, are the coherence time (T2), the lifetime of the qubit, and the spin-lattice relaxation time (T1), the thermally defined upper limit of T2. To achieve QIP, processable qubits with long coherence times are required. Recent studies on (Ph4P-d20)2[V(C8S8)3], a vanadium-based qubit, demonstrate that millisecond T2 times are achievable in transition metal complexes with nuclear spin-free environments. Applying these principles to vanadyl complexes offers a route to combine the previously established surface compatibility of the flatter vanadyl structures with a long T2. Toward those ends, we investigated a series of four qubits, (Ph4P)2[VO(C8S8)2] (1), (Ph4P)2[VO(β-C3S5)2] (2), (Ph4P)2[VO(α-C3S5)2] (3), and (Ph4P)2[VO(C3S4O)2] (4), by pulsed electron paramagnetic resonance (EPR) spectroscopy and compared the performance of these species with our recently reported set of vanadium tris(dithiolene) complexes. Crucially we demonstrate that solutions of 1-4 in SO2, a uniquely polar nuclear spin-free solvent, reveal T2 values of up to 152(6) μs, comparable to the best molecular qubit candidates. Upon transitioning to vanadyl species from the tris(dithiolene) analogues, we observe a remarkable order of magnitude increase in T1, attributed to stronger solute-solvent interactions with the polar vanadium-oxo moiety. Simultaneously, we detect a small decrease in T2 for the vanadyl analogues relative to the tris(dithiolene) complexes. We attribute this decrease to the absence of one nuclear spin-free ligand, which served to shield the vanadium centers against solvent nuclear spins. Our results highlight new design principles for long T1 and T2 times by demonstrating the efficacy of ligand-based tuning of solute-solvent interactions.
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Affiliation(s)
- Chung-Jui Yu
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
| | - Michael J Graham
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
| | - Joseph M Zadrozny
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
| | - Jens Niklas
- Chemical Sciences and Engineering Division, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Matthew D Krzyaniak
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.,Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University , Evanston, Illinois 60208-3113, United States
| | - Michael R Wasielewski
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.,Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University , Evanston, Illinois 60208-3113, United States
| | - Oleg G Poluektov
- Chemical Sciences and Engineering Division, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Danna E Freedman
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
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22
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Werncke CG, Bouammali MA, Baumard J, Suaud N, Martins C, Guihéry N, Vendier L, Zheng J, Sortais JB, Darcel C, Sabo-Etienne S, Sutter JP, Bontemps S, Pichon C. Ising-type Magnetic Anisotropy and Slow Relaxation of the Magnetization in Four-Coordinate Amido-Pyridine FeII Complexes. Inorg Chem 2016; 55:10968-10977. [DOI: 10.1021/acs.inorgchem.6b01512] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- C. Gunnar Werncke
- CNRS, LCC, 205 route
de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, LCC, F-31007 Toulouse, France
| | | | - Julie Baumard
- LCPQ, Université de Toulouse III, 118
route de Narbonne, F-31062 Toulouse, France
| | - Nicolas Suaud
- LCPQ, Université de Toulouse III, 118
route de Narbonne, F-31062 Toulouse, France
| | - Cyril Martins
- LCPQ, Université de Toulouse III, 118
route de Narbonne, F-31062 Toulouse, France
| | - Nathalie Guihéry
- LCPQ, Université de Toulouse III, 118
route de Narbonne, F-31062 Toulouse, France
| | - Laure Vendier
- CNRS, LCC, 205 route
de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, LCC, F-31007 Toulouse, France
| | - Jianxia Zheng
- Team Organometallics:
Materials and Catalysis, Centre for Catalysis and Green Chemistry,
Campus de Beaulieu, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, 263 av. du Général
Leclerc, F-35042 Rennes Cedex, France
| | - Jean-Baptiste Sortais
- Team Organometallics:
Materials and Catalysis, Centre for Catalysis and Green Chemistry,
Campus de Beaulieu, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, 263 av. du Général
Leclerc, F-35042 Rennes Cedex, France
| | - Christophe Darcel
- Team Organometallics:
Materials and Catalysis, Centre for Catalysis and Green Chemistry,
Campus de Beaulieu, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, 263 av. du Général
Leclerc, F-35042 Rennes Cedex, France
| | - Sylviane Sabo-Etienne
- CNRS, LCC, 205 route
de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, LCC, F-31007 Toulouse, France
| | - Jean-Pascal Sutter
- CNRS, LCC, 205 route
de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, LCC, F-31007 Toulouse, France
| | - Sébastien Bontemps
- CNRS, LCC, 205 route
de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, LCC, F-31007 Toulouse, France
| | - Céline Pichon
- CNRS, LCC, 205 route
de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, LCC, F-31007 Toulouse, France
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23
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Fataftah MS, Coste SC, Vlaisavljevich B, Zadrozny JM, Freedman DE. Transformation of the coordination complex [Co(C 3S 5) 2] 2- from a molecular magnet to a potential qubit. Chem Sci 2016; 7:6160-6166. [PMID: 30034755 PMCID: PMC6024178 DOI: 10.1039/c6sc02170k] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Accepted: 06/09/2016] [Indexed: 12/25/2022] Open
Abstract
We employ ac susceptibility as a probe of small changes of transverse zero-field splitting, revealing that these subtle changes transform [Co(C3S5)2]2– from a molecular magnet to a candidate qubit.
Mononuclear transition metal complexes demonstrate significant potential in the divergent applications of spintronics and quantum information processing. The facile tunability of these complexes enables structure function correlations for a plethora of relevant magnetic quantities. We present a series of pseudotetrahedral [Co(C3S5)2]2– complexes with varying deviations from D2d symmetry to investigate the influence of structural distortions on spin relaxation dynamics and qubit viability, as tuned by the variable transverse magnetic anisotropy, E. To overcome the traditional challenge of measuring E in species where D ≫ E, we employed a different approach of harnessing ac magnetic susceptibility to probe the emergence of quantum tunneling of magnetization as a proxy for E. Across the range of values for E in the series, we observe magnetic hysteresis for the smallest value of E. The hysteresis disappears with increasing E, concomitant with the appearance of an observable, low frequency (L-band) electron paramagnetic resonance (EPR) signal, indicating the potential to controllably shift the molecule's utilization from classical to quantum information processing applications. The development of design principles for molecular magnet information processing requires separate design principles for classical versus quantum regimes. Here we show for the first time how subtle structural changes can switch the utility of a complex between these two types of applications.
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Affiliation(s)
- Majed S Fataftah
- Department of Chemistry , Northwestern University , Evanston , IL 60208 , USA .
| | - Scott C Coste
- Department of Chemistry , Northwestern University , Evanston , IL 60208 , USA .
| | - Bess Vlaisavljevich
- Department of Chemistry , Northwestern University , Evanston , IL 60208 , USA .
| | - Joseph M Zadrozny
- Department of Chemistry , Northwestern University , Evanston , IL 60208 , USA .
| | - Danna E Freedman
- Department of Chemistry , Northwestern University , Evanston , IL 60208 , USA .
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24
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Gaita-Ariño A, Prima-García H, Cardona-Serra S, Escalera-Moreno L, Rosaleny LE, Baldoví JJ. Coherence and organisation in lanthanoid complexes: from single ion magnets to spin qubits. Inorg Chem Front 2016. [DOI: 10.1039/c5qi00296f] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Molecular magnetism is reaching a degree of development that will allow for the rational design of sophisticated systems.
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Affiliation(s)
| | - Helena Prima-García
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- 46980 Paterna
- Spain
| | | | | | - Lorena E. Rosaleny
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- 46980 Paterna
- Spain
| | - José J. Baldoví
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- 46980 Paterna
- Spain
- Institut de Chimie Moléculaire et des Matériaux d'Orsay
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