1
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Adams AC, Kufcsák A, Lochenie C, Khadem M, Akram AR, Dhaliwal K, Seth S. Fibre-optic based exploration of lung cancer autofluorescence using spectral fluorescence lifetime. Biomed Opt Express 2024; 15:1132-1147. [PMID: 38404342 PMCID: PMC10890895 DOI: 10.1364/boe.515609] [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] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Accepted: 01/05/2024] [Indexed: 02/27/2024]
Abstract
Fibre-optic based time-resolved fluorescence spectroscopy (TRFS) is an advanced spectroscopy technique that generates sample-specific spectral-temporal signature, characterising variations in fluorescence in real-time. As such, it can be used to interrogate tissue autofluorescence. Recent advancements in TRFS technology, including the development of devices that simultaneously measure high-resolution spectral and temporal fluorescence, paired with novel analysis methods extracting information from these multidimensional measurements effectively, provide additional insight into the underlying autofluorescence features of a sample. This study demonstrates, using both simulated data and endogenous fluorophores measured bench-side, that the shape of the spectral fluorescence lifetime, or fluorescence lifetimes estimated over high-resolution spectral channels across a broad range, is influenced by the relative abundance of underlying fluorophores in mixed systems and their respective environment. This study, furthermore, explores the properties of the spectral fluorescence lifetime in paired lung tissue deemed either abnormal or normal by pathologists. We observe that, on average, the shape of the spectral fluorescence lifetime at multiple locations sampled on 14 abnormal lung tissue, compared to multiple locations sampled on the respective paired normal lung tissue, shows more variability; and, while not statistically significant, the average spectral fluorescence lifetime in abnormal tissue is consistently lower over every wavelength than the normal tissue.
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Affiliation(s)
- Alexandra C. Adams
- Translational Healthcare Technology Group, Institute for Regeneration and Repair, 5 Little France Dr, Edinburgh EH16 4UU, UK
| | - András Kufcsák
- Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK
| | - Charles Lochenie
- Translational Healthcare Technology Group, Institute for Regeneration and Repair, 5 Little France Dr, Edinburgh EH16 4UU, UK
| | - Mohsen Khadem
- Translational Healthcare Technology Group, Institute for Regeneration and Repair, 5 Little France Dr, Edinburgh EH16 4UU, UK
- School of Informatics, University of Edinburgh, Edinburgh EH8 9AB, UK
| | - Ahsan R. Akram
- Translational Healthcare Technology Group, Institute for Regeneration and Repair, 5 Little France Dr, Edinburgh EH16 4UU, UK
| | - Kevin Dhaliwal
- Translational Healthcare Technology Group, Institute for Regeneration and Repair, 5 Little France Dr, Edinburgh EH16 4UU, UK
| | - Sohan Seth
- Translational Healthcare Technology Group, Institute for Regeneration and Repair, 5 Little France Dr, Edinburgh EH16 4UU, UK
- School of Informatics, University of Edinburgh, Edinburgh EH8 9AB, UK
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2
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Mohanan SMPC, Russell K, Duncan S, Kiang A, Lochenie C, Duffy E, Kennedy S, Prajna NV, Williams RL, Dhaliwal K, Williams GOS, Mills B. FluoroPi Device With SmartProbes: A Frugal Point-of-Care System for Fluorescent Detection of Bacteria From a Pre-Clinical Model of Microbial Keratitis. Transl Vis Sci Technol 2023; 12:1. [PMID: 37395707 DOI: 10.1167/tvst.12.7.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2023] Open
Abstract
Purpose Rapid and accurate diagnosis of microbial keratitis (MK) could greatly improve patient outcomes. Here, we present the development of a rapid, accessible multicolour fluorescence imaging device (FluoroPi) and evaluate its performance in combination with fluorescent optical reporters (SmartProbes) to distinguish bacterial Gram status. Furthermore, we show feasibility by imaging samples obtained by corneal scrape and minimally invasive corneal impression membrane (CIM) from ex vivo porcine corneal MK models. Methods FluoroPi was built using a Raspberry Pi single-board computer and camera, light-emitting-diodes (LEDs), and filters for white-light and fluorescent imaging, with excitation and detection of bacterial optical SmartProbes: Gram-negative, NBD-PMX (exmax 488 nm); Gram positive, Merocy-Van (exmax 590 nm). We evaluated FluoroPi with bacteria (Pseudomonas aeruginosa and Staphylococcus aureus) isolated from ex vivo porcine corneal models of MK by scrape (needle) and CIM with the SmartProbes. Results FluoroPi provides <1 µm resolution and was able to readily distinguish bacteria isolated from ex vivo models of MK from tissue debris when combined with SmartProbes, retrieved by both scrape and CIM. Single bacteria could be resolved within the field of view, with limits of detection demonstrated as 103 to 104 CFU/mL. Sample preparation prior to imaging was minimal (wash-free), and imaging and postprocessing with FluoroPi were straightforward, confirming ease of use. Conclusions FluoroPi coupled with SmartProbes provides effective, low-cost bacterial imaging, delineating Gram-negative and Gram-positive bacteria directly sampled from a preclinical model of MK. Translational Relevance This study provides a crucial stepping stone toward clinical translation of a rapid, minimally invasive diagnostic approach for MK.
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Affiliation(s)
- Syam Mohan P C Mohanan
- Translational Healthcare Technologies Group, Centre for Inflammation Research, University of Edinburgh, Edinburgh, UK
| | - Kay Russell
- Translational Healthcare Technologies Group, Centre for Inflammation Research, University of Edinburgh, Edinburgh, UK
| | - Sheelagh Duncan
- Translational Healthcare Technologies Group, Centre for Inflammation Research, University of Edinburgh, Edinburgh, UK
| | - Alex Kiang
- Translational Healthcare Technologies Group, Centre for Inflammation Research, University of Edinburgh, Edinburgh, UK
| | - Charles Lochenie
- Translational Healthcare Technologies Group, Centre for Inflammation Research, University of Edinburgh, Edinburgh, UK
| | - Emma Duffy
- Translational Healthcare Technologies Group, Centre for Inflammation Research, University of Edinburgh, Edinburgh, UK
| | - Stephnie Kennedy
- Department of Eye and Vision Science, University of Liverpool, Liverpool, UK
| | - N Venkatesh Prajna
- Department of Cornea and Refractive Surgery, Aravind Eye Hospital, Madurai, India
| | - Rachel L Williams
- Department of Eye and Vision Science, University of Liverpool, Liverpool, UK
| | - Kevin Dhaliwal
- Translational Healthcare Technologies Group, Centre for Inflammation Research, University of Edinburgh, Edinburgh, UK
| | - Gareth O S Williams
- Translational Healthcare Technologies Group, Centre for Inflammation Research, University of Edinburgh, Edinburgh, UK
| | - Bethany Mills
- Translational Healthcare Technologies Group, Centre for Inflammation Research, University of Edinburgh, Edinburgh, UK
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3
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Benson S, Kiang A, Lochenie C, Lal N, Mohanan SMPC, Williams GOS, Dhaliwal K, Mills B, Vendrell M. Environmentally sensitive photosensitizers enable targeted photodynamic ablation of Gram-positive antibiotic resistant bacteria. Theranostics 2023; 13:3814-3825. [PMID: 37441588 PMCID: PMC10334829 DOI: 10.7150/thno.84187] [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: 03/10/2023] [Accepted: 05/09/2023] [Indexed: 07/15/2023] Open
Abstract
Bacterial infections remain among the biggest challenges to human health, leading to high antibiotic usage, morbidity, hospitalizations, and accounting for approximately 8 million deaths worldwide every year. The overuse of antibiotics and paucity of antimicrobial innovation has led to antimicrobial resistant pathogens that threaten to reverse key advances of modern medicine. Photodynamic therapeutics can kill bacteria but there are few agents that can ablate pathogens with minimal off-target effects. Methods: We describe nitrobenzoselenadiazoles as some of the first environmentally sensitive organic photosensitizers, and their adaptation to produce theranostics with optical detection and light-controlled antimicrobial activity. We combined nitrobenzoselenadiazoles with bacteria-targeting moieties (i.e., glucose-6-phosphate, amoxicillin, vancomycin) producing environmentally sensitive photodynamic agents. Results: The labelled vancomycin conjugate was able to both visualize and eradicate multidrug resistant Gram-positive ESKAPE pathogens at nanomolar concentrations, including clinical isolates and those that form biofilms. Conclusion: Nitrobenzoselenadiazole conjugates are easily synthesized and display strong environment dependent ROS production. Due to their small size and non-invasive character, they unobtrusively label antimicrobial targeting moieties. We envisage that the simplicity and modularity of this chemical strategy will accelerate the rational design of new antimicrobial therapies for refractory bacterial infections.
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Affiliation(s)
- Sam Benson
- Centre for Inflammation Research, The University of Edinburgh, Edinburgh EH16 4TJ, UK
- IRR Chemistry Hub, Institute for Regeneration and Repair, The University of Edinburgh, Edinburgh EH16 4UU, UK
| | - Alex Kiang
- Centre for Inflammation Research, The University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Charles Lochenie
- Centre for Inflammation Research, The University of Edinburgh, Edinburgh EH16 4TJ, UK
- IRR Chemistry Hub, Institute for Regeneration and Repair, The University of Edinburgh, Edinburgh EH16 4UU, UK
| | - Navita Lal
- Centre for Inflammation Research, The University of Edinburgh, Edinburgh EH16 4TJ, UK
| | | | - Gareth O. S. Williams
- Centre for Inflammation Research, The University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Kevin Dhaliwal
- Centre for Inflammation Research, The University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Bethany Mills
- Centre for Inflammation Research, The University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Marc Vendrell
- Centre for Inflammation Research, The University of Edinburgh, Edinburgh EH16 4TJ, UK
- IRR Chemistry Hub, Institute for Regeneration and Repair, The University of Edinburgh, Edinburgh EH16 4UU, UK
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4
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Lochenie C, Insuasty A, Battisti T, Pesce L, Gardin A, Perego C, Dentinger M, Wang D, Pavan GM, Aliprandi A, De Cola L. Solvent-driven chirality for luminescent self-assembled structures: experiments and theory. Nanoscale 2020; 12:21359-21367. [PMID: 33075118 PMCID: PMC8251519 DOI: 10.1039/d0nr04524a] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Accepted: 10/12/2020] [Indexed: 05/03/2023]
Abstract
We describe, for a single platinum complex bearing a dipeptide moiety, a solvent-driven interconversion from twisted to straight micrometric assembled structures with different chirality. The photophysical and morphological properties of the aggregates have been investigated as well as the role of the media and concentration. A real-time visualization of the solvent-driven interconversion processes has been achieved by confocal microscopy. Finally, atomistic and coarse-grained simulations, providing results consistent with the experimental observations, allow to obtain a molecular-level insight into the interesting solvent-responsive behavior of this system.
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Affiliation(s)
- Charles Lochenie
- Laboratoire de Chimie et des Biomatériaux Supramoléculaires, Institut de Science et d'Ingénierie Supramoléculaires (UMR 7006), Université de Strasbourg & CNRS, 8, allée Gaspard Monge, 67000 Strasbourg, France.
| | - Alberto Insuasty
- Laboratoire de Chimie et des Biomatériaux Supramoléculaires, Institut de Science et d'Ingénierie Supramoléculaires (UMR 7006), Université de Strasbourg & CNRS, 8, allée Gaspard Monge, 67000 Strasbourg, France.
| | - Tommaso Battisti
- Laboratoire de Chimie et des Biomatériaux Supramoléculaires, Institut de Science et d'Ingénierie Supramoléculaires (UMR 7006), Université de Strasbourg & CNRS, 8, allée Gaspard Monge, 67000 Strasbourg, France.
| | - Luca Pesce
- Department of Innovative Technologies, University of Applied Sciences and Arts of Southern Switzerland, CH-6928 Manno, Switzerland
| | - Andrea Gardin
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy.
| | - Claudio Perego
- Department of Innovative Technologies, University of Applied Sciences and Arts of Southern Switzerland, CH-6928 Manno, Switzerland
| | - Mike Dentinger
- Laboratoire de Chimie et des Biomatériaux Supramoléculaires, Institut de Science et d'Ingénierie Supramoléculaires (UMR 7006), Université de Strasbourg & CNRS, 8, allée Gaspard Monge, 67000 Strasbourg, France.
| | - Di Wang
- Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldschaffen, Germany
| | - Giovanni M Pavan
- Department of Innovative Technologies, University of Applied Sciences and Arts of Southern Switzerland, CH-6928 Manno, Switzerland and Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy.
| | - Alessandro Aliprandi
- Laboratoire de Chimie et des Biomatériaux Supramoléculaires, Institut de Science et d'Ingénierie Supramoléculaires (UMR 7006), Université de Strasbourg & CNRS, 8, allée Gaspard Monge, 67000 Strasbourg, France.
| | - Luisa De Cola
- Laboratoire de Chimie et des Biomatériaux Supramoléculaires, Institut de Science et d'Ingénierie Supramoléculaires (UMR 7006), Université de Strasbourg & CNRS, 8, allée Gaspard Monge, 67000 Strasbourg, France. and Institut für Nanotechnologie (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldschaffen, Germany
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5
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Dankhoff K, Lochenie C, Weber B. Iron(II) Spin Crossover Complexes with 4,4'-Dipyridylethyne-Crystal Structures and Spin Crossover with Hysteresis. Molecules 2020; 25:molecules25030581. [PMID: 32013168 PMCID: PMC7037042 DOI: 10.3390/molecules25030581] [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] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 01/22/2020] [Accepted: 01/27/2020] [Indexed: 11/29/2022] Open
Abstract
Three new iron(II) 1D coordination polymers with cooperative spin crossover behavior showing thermal hysteresis loops were synthesized using N2O2 Schiff base-like equatorial ligands and 4,4′-dipyridylethyne as a bridging, rigid axial linker. One of those iron(II) 1D coordination polymers showed a 73 K wide hysteresis below room temperature, which, upon solvent loss, decreased to a still remarkable 30 K wide hysteresis. Single crystal X-ray structures of two iron(II) coordination polymers and T-dependent powder XRD patterns are discussed to obtain insight into the structure property relationship of those materials.
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6
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Schönfeld S, Lochenie C, Hörner G, Weber B. Iron(II) complexes with N 2O 2 coordinating Schiff base-like equatorial ligand and 1,2-bis(pyridin-2-ylethynyl)benzene as axial pincer ligand. J Phys Condens Matter 2019; 31:504002. [PMID: 31469114 DOI: 10.1088/1361-648x/ab3e92] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Three new unique mononuclear iron(II) pincer complexes were synthesized using 1,2-bis(pyridin-2-ylethynyl)benzene as axially coordinating pincer ligand and N2O2 coordinating Schiff base-like equatorial ligands. Magnetic susceptibility measurements reveal that all three complexes remain in the high spin state throughout the entire temperature range investigated. Reasons for this are restraining sterical interactions revealed in the single crystal x-ray structure analysis and extended DFT-computational studies of one of the pincer complexes. Those interactions also lead to the formation of unexpected side products during the synthesis such as a complex with two ethanol molecules as axial ligand, whose x-ray structure was determined.
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7
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Herber U, Moegling J, Siris R, Hoffmann A, Mayer P, Göbel C, Lochenie C, Weber B, Herres-Pawlis S. A Study on FeII
, ZnII
and CuII
Complexes with Novel Tridentate Bis(pyrazolyl)methane Ligands. Z Anorg Allg Chem 2018. [DOI: 10.1002/zaac.201800095] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [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)
- Ulrich Herber
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Julian Moegling
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Rita Siris
- Department of Chemistry and Pharmacy; Ludwig-Maximilian University; Butenandtstr. 5-13 81377 München Germany
| | - Alexander Hoffmann
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Peter Mayer
- Department of Chemistry and Pharmacy; Ludwig-Maximilian University; Butenandtstr. 5-13 81377 München Germany
| | - Christoph Göbel
- Inorganic Chemistry II; University of Bayreuth; Universitätsstraße 30 95440 Bayreuth Germany
| | - Charles Lochenie
- Inorganic Chemistry II; University of Bayreuth; Universitätsstraße 30 95440 Bayreuth Germany
- Laboratoire de Chimie et des Biomatériaux Supramoléculaires; Institut de Sciences et d'Ingénierie Supramoléculaires; 67000 Strasbourg France
| | - Birgit Weber
- Inorganic Chemistry II; University of Bayreuth; Universitätsstraße 30 95440 Bayreuth Germany
| | - Sonja Herres-Pawlis
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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8
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Kurz H, Lochenie C, Wagner KG, Schneider S, Karg M, Weber B. Frontispiece: Synthesis and Optical Properties of Phenanthroline-Derived Schiff Base-Like Dinuclear Ru II
-Ni II
Complexes. Chemistry 2018. [DOI: 10.1002/chem.201882066] [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)
- Hannah Kurz
- Anorganische Chemie II; Universität Bayreuth; Universitätsstr. 30, NW I 95440 Bayreuth Germany
| | - Charles Lochenie
- Anorganische Chemie II; Universität Bayreuth; Universitätsstr. 30, NW I 95440 Bayreuth Germany
- Laboratoire de Chimie et des Biomatériaux Supramoléculaires, Institut de Sciences et d'Ingénierie Supramoléculaires; Université de Strasbourg; 67083 Strasbourg Cedex France
| | - Kristina G. Wagner
- Physikalische Chemie I; Heinrich-Heine-Universität Düsseldorf; 40204 Düsseldorf Germany
| | - Sandra Schneider
- Anorganische Chemie II; Universität Bayreuth; Universitätsstr. 30, NW I 95440 Bayreuth Germany
| | - Matthias Karg
- Physikalische Chemie I; Heinrich-Heine-Universität Düsseldorf; 40204 Düsseldorf Germany
| | - Birgit Weber
- Anorganische Chemie II; Universität Bayreuth; Universitätsstr. 30, NW I 95440 Bayreuth Germany
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9
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Kurz H, Lochenie C, Wagner KG, Schneider S, Karg M, Weber B. Synthesis and Optical Properties of Phenanthroline-Derived Schiff Base-Like Dinuclear RuII-NiIIComplexes. Chemistry 2018; 24:5100-5111. [DOI: 10.1002/chem.201704632] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Hannah Kurz
- Anorganische Chemie II; Universität Bayreuth; Universitätsstr. 30, NW I 95440 Bayreuth Germany
| | - Charles Lochenie
- Anorganische Chemie II; Universität Bayreuth; Universitätsstr. 30, NW I 95440 Bayreuth Germany
- Laboratoire de Chimie et des Biomatériaux Supramoléculaires, Institut de Sciences et d'Ingénierie Supramoléculaires; Université de Strasbourg; 67083 Strasbourg Cedex France
| | - Kristina G. Wagner
- Physikalische Chemie I; Heinrich-Heine-Universität Düsseldorf; 40204 Düsseldorf Germany
| | - Sandra Schneider
- Anorganische Chemie II; Universität Bayreuth; Universitätsstr. 30, NW I 95440 Bayreuth Germany
| | - Matthias Karg
- Physikalische Chemie I; Heinrich-Heine-Universität Düsseldorf; 40204 Düsseldorf Germany
| | - Birgit Weber
- Anorganische Chemie II; Universität Bayreuth; Universitätsstr. 30, NW I 95440 Bayreuth Germany
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10
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Lochenie C, Schötz K, Panzer F, Kurz H, Maier B, Puchtler F, Agarwal S, Köhler A, Weber B. Spin-Crossover Iron(II) Coordination Polymer with Fluorescent Properties: Correlation between Emission Properties and Spin State. J Am Chem Soc 2018; 140:700-709. [PMID: 29251919 DOI: 10.1021/jacs.7b10571] [Citation(s) in RCA: 129] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A spin-crossover coordination polymer [Fe(L1)(bipy)]n (where L = a N2O22- coordinating Schiff base-like ligand bearing a phenazine fluorophore and bipy = 4,4'-bipyridine) was synthesized and exhibits a 48 K wide thermal hysteresis above room temperature (T1/2↑ = 371 K and T1/2↓ = 323 K) that is stable for several cycles. The spin transition was characterized using magnetic measurements, Mössbauer spectroscopy, and DSC measurements. T-dependent X-ray powder diffraction reveals a structural phase transition coupled with the spin transition phenomenon. The dimeric excerpt {(μ-bipy)[FeL1(MeOH)]2}·2MeOH of the coordination polymer chain crystallizes in the triclinic space group P1̅ and reveals that the packing of the molecules in the crystal is dominated by hydrogen bonds. Investigation of the emission properties of the complexes with regard to temperature shows that the spin crossover can be tracked by monitoring the emission spectra, since the emission color changes from greenish to a yellow color upon the low spin-to-high spin transition.
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Affiliation(s)
- Charles Lochenie
- Inorganic Chemistry II, Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Konstantin Schötz
- Experimental Physics II and Bayreuth Institute of Macromolecular Research (BMBF) Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Fabian Panzer
- Experimental Physics II and Bayreuth Institute of Macromolecular Research (BMBF) Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Hannah Kurz
- Inorganic Chemistry II, Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Bernadette Maier
- Inorganic Chemistry II, Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Florian Puchtler
- Inorganic Chemistry I, Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Seema Agarwal
- Macromolecular Chemistry II, Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Anna Köhler
- Experimental Physics II and Bayreuth Institute of Macromolecular Research (BMBF) Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
| | - Birgit Weber
- Inorganic Chemistry II, Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany
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11
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Petzold H, Djomgoue P, Hörner G, Lochenie C, Weber B, Rüffer T. Bis-meridional Fe2+ spincrossover complexes of phenyl and pyridyl substituted 2-(pyridin-2-yl)-1,10-phenanthrolines. Dalton Trans 2018; 47:491-506. [DOI: 10.1039/c7dt02320k] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Fe2+ spincrossover complexes [Fe(L)2]2+ (L = substituted (pyridin-2-yl)-1,10-phenanthroline) were prepared and SCO with changing coordination numbers was identified by 1H NMR spectroscopy and in silico modeling.
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Affiliation(s)
- Holm Petzold
- TU Chemnitz
- Institut für Chemie
- Anorganische Chemie
- 09111 Chemnitz
- Germany
| | - Paul Djomgoue
- TU Chemnitz
- Institut für Chemie
- Anorganische Chemie
- 09111 Chemnitz
- Germany
| | | | - Charles Lochenie
- Anorganische Chemie II
- Universität Bayreuth
- 95440 Bayreuth
- Germany
- Institut de science et d'ingénierie supramoléculaires (ISIS)
| | - Birgit Weber
- Anorganische Chemie II
- Universität Bayreuth
- 95440 Bayreuth
- Germany
| | - Tobias Rüffer
- TU Chemnitz
- Institut für Chemie
- Anorganische Chemie
- 09111 Chemnitz
- Germany
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12
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Herber U, Hegner K, Wolters D, Siris R, Wrobel K, Hoffmann A, Lochenie C, Weber B, Kuckling D, Herres-Pawlis S. Iron(II) and Zinc(II) Complexes with Tetradentate Bis(pyrazolyl)methane Ligands as Catalysts for the Ring-Opening Polymerisation ofrac-Lactide. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201601345] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ulrich Herber
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Katharina Hegner
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Daniel Wolters
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Rita Siris
- Department of Chemistry and Pharmacy; LMU Munich; Butenandtstr. 5-13 81377 München Germany
| | - Karina Wrobel
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Alexander Hoffmann
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Charles Lochenie
- Inorganic Chemistry II; University of Bayreuth; Universitätsstraße 30 95440 Bayreuth Germany
| | - Birgit Weber
- Inorganic Chemistry II; University of Bayreuth; Universitätsstraße 30 95440 Bayreuth Germany
| | - Dirk Kuckling
- Department of Chemistry; Paderborn University; Warburger Str. 100 33098 Paderborn Germany
| | - Sonja Herres-Pawlis
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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13
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Petzold H, Djomgoue P, Hörner G, Heider S, Lochenie C, Weber B, Rüffer T, Schaarschmidt D. Spin state variability in Fe2+ complexes of substituted (2-(pyridin-2-yl)-1,10-phenanthroline) ligands as versatile terpyridine analogues. Dalton Trans 2017; 46:6218-6229. [DOI: 10.1039/c7dt00422b] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [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
Fe2+ spin crossover complexes [Fe(L)2]2+ (L = substituted (pyridin-2-yl)-1,10-phenanthroline) were prepared and SCO properties were investigated in solution and in the solid state by an experiment and in silico.
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Affiliation(s)
- Holm Petzold
- TU Chemnitz
- Institut für Chemie
- Anorganische Chemie
- 09111 Chemnitz
- Germany
| | - Paul Djomgoue
- TU Chemnitz
- Institut für Chemie
- Anorganische Chemie
- 09111 Chemnitz
- Germany
| | | | - Silvio Heider
- TU Chemnitz
- Institut für Chemie
- Anorganische Chemie
- 09111 Chemnitz
- Germany
| | - Charles Lochenie
- Institut de science et d'ingénierie supramoléculaires (ISIS)
- Université de Strasbourg & CNRS
- 67000 Strasbourg
- France
| | - Birgit Weber
- Anorganische Chemie II
- Universität Bayreuth
- 95440 Bayreuth
- Germany
| | - Tobias Rüffer
- TU Chemnitz
- Institut für Chemie
- Anorganische Chemie
- 09111 Chemnitz
- Germany
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14
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Dankhoff K, Lochenie C, Puchtler F, Weber B. Solvent Influence on the Magnetic Properties of Iron(II) Spin-Crossover Coordination Compounds with 4,4′-Dipyridylethyne as Linker. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501175] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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15
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Lochenie C, Gebauer A, Klimm O, Puchtler F, Weber B. Iron(ii) spin crossover complexes with diaminonaphthalene-based Schiff base-like ligands: 1D coordination polymers. NEW J CHEM 2016. [DOI: 10.1039/c5nj02470f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [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
Iron(ii) spin crossover coordination polymers with diaminonaphthalene derived Schiff base-like ligands were synthesised, and their magnetic and structural properties were analysed. Rigid bridging ligands having up to 40 K wide hysteresis loops were observed.
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Affiliation(s)
| | - Andreas Gebauer
- Inorganic Chemistry II
- Universität Bayreuth
- 95440 Bayreuth
- Germany
| | - Ottokar Klimm
- Inorganic Chemistry II
- Universität Bayreuth
- 95440 Bayreuth
- Germany
| | | | - Birgit Weber
- Inorganic Chemistry II
- Universität Bayreuth
- 95440 Bayreuth
- Germany
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16
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Schliebe C, Pfaff U, Gemming T, Lochenie C, Weber B, Lang H. Si(OCH
2
Fc)
4
: Synthesis, Electrochemical Behavior, and Twin Polymerization. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500464] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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)
- Christian Schliebe
- Technische Universität Chemnitz, Faculty of Natural Sciences, Institute of Chemistry, Inorganic Chemistry, 09107 Chemnitz, Germany, https://www.tu‐chemnitz.de/chemie/anorg/
| | - Ulrike Pfaff
- Technische Universität Chemnitz, Faculty of Natural Sciences, Institute of Chemistry, Inorganic Chemistry, 09107 Chemnitz, Germany, https://www.tu‐chemnitz.de/chemie/anorg/
| | - Thomas Gemming
- IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - Charles Lochenie
- Universität Bayreuth, Institute of Chemistry, Inorganic Chemistry II, 95440 Bayreuth, Germany
| | - Birgit Weber
- Universität Bayreuth, Institute of Chemistry, Inorganic Chemistry II, 95440 Bayreuth, Germany
| | - Heinrich Lang
- Technische Universität Chemnitz, Faculty of Natural Sciences, Institute of Chemistry, Inorganic Chemistry, 09107 Chemnitz, Germany, https://www.tu‐chemnitz.de/chemie/anorg/
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17
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Adner D, Korb M, Lochenie C, Weber B, Lang H. Crystal Structure and Magnetic Properties of a Hexanuclear Copper(II) Carboxylate. Z Anorg Allg Chem 2015. [DOI: 10.1002/zaac.201400519] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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18
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Herber U, Hoffmann A, Lochenie C, Weber B, Herres-Pawlis S. N-Donor Competition in Iron Bis(chelate) Bis(pyrazolyl)pyridinylmethane Complexes. ACTA ACUST UNITED AC 2015. [DOI: 10.5560/znb.2014-4176] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
We report on the synthesis and structural characterisation of the bis(chelate) bis(pyrazolyl) pyridinylmethane iron(II) complexes [Fe{HC(Pz)2(Py)}2][CF3CO2]2, [Fe{HC(3-iPrPz)(5- iPrPz)(Py)}2][CF3SO3]2 and [Fe{HC(3-iPrPz)(5-iPrPz)(Py)}2][FeBr4]Br·2C4H8O. During the synthesis of the latter ones, an isomerisation of the ligand is observed: the pyrazolyl substituent formally moves from the 3 to the 5 position. Since the donor competition between pyrazolyl and pyridinyl moieties is important for the coordination properties, we also studied the donor properties by density functional theory and natural bond orbital analysis (NBO). As a result, the pyridinyl donor is generally weaker than the pyrazolyl donor, but the pyrazolyl donor is heavily influenced by the alkyl substitution pattern. To confirm the low-spin state of the complexes, magnetic susceptibility measurements have been performed
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Affiliation(s)
- Ulrich Herber
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5 – 13, 81377 München, Germany
| | - Alexander Hoffmann
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5 – 13, 81377 München, Germany
| | - Charles Lochenie
- Universität Bayreuth, Anorganische Chemie II, Universitätsstraße 30, NW I, 95440 Bayreuth, Germany
| | - Birgit Weber
- Universität Bayreuth, Anorganische Chemie II, Universitätsstraße 30, NW I, 95440 Bayreuth, Germany
| | - Sonja Herres-Pawlis
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5 – 13, 81377 München, Germany
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19
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Lochenie C, Heinz J, Milius W, Weber B. Iron(ii) spin crossover complexes with diaminonaphthalene-based Schiff base-like ligands: mononuclear complexes. Dalton Trans 2015; 44:18065-77. [DOI: 10.1039/c5dt03048j] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [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
Iron(ii) spin crossover (SCO) complexes with diaminonaphthalene derived Schiff base-like ligand were synthesised, and their magnetic and structural properties analysed.
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Affiliation(s)
| | - Julia Heinz
- Inorganic Chemistry II
- Universität Bayreuth
- 95440 Bayreuth
- Germany
| | - Wolfgang Milius
- Inorganic Chemistry I
- Universität Bayreuth
- 95440 Bayreuth
- Germany
| | - Birgit Weber
- Inorganic Chemistry II
- Universität Bayreuth
- 95440 Bayreuth
- Germany
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20
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Schönfeld S, Lochenie C, Thoma P, Weber B. 1D iron(ii) spin crossover coordination polymers with 3,3′-azopyridine – kinetic trapping effects and spin transition above room temperature. CrystEngComm 2015. [DOI: 10.1039/c5ce00800j] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Schlamp S, Lochenie C, Bauer T, Kempe R, Weber B. Iron(II) Spin‐Crossover Complexes with Schiff Base Like Ligands and
N
‐Alkylimidazoles. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201403021] [Citation(s) in RCA: 4] [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)
- Stephan Schlamp
- Lehrstuhl für Anorganische Chemie II, Universität Bayreuth, Universitätsstraße 30, NW 1, 95440 Bayreuth, Germany, http://www.ac2‐weber.uni‐bayreuth.de
| | - Charles Lochenie
- Lehrstuhl für Anorganische Chemie II, Universität Bayreuth, Universitätsstraße 30, NW 1, 95440 Bayreuth, Germany, http://www.ac2‐weber.uni‐bayreuth.de
| | - Tobias Bauer
- Lehrstuhl für Anorganische Chemie II, Universität Bayreuth, Universitätsstraße 30, NW 1, 95440 Bayreuth, Germany, http://www.ac2‐weber.uni‐bayreuth.de
| | - Rhett Kempe
- Lehrstuhl für Anorganische Chemie II, Universität Bayreuth, Universitätsstraße 30, NW 1, 95440 Bayreuth, Germany, http://www.ac2‐weber.uni‐bayreuth.de
| | - Birgit Weber
- Lehrstuhl für Anorganische Chemie II, Universität Bayreuth, Universitätsstraße 30, NW 1, 95440 Bayreuth, Germany, http://www.ac2‐weber.uni‐bayreuth.de
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22
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Lochenie C, Bauer W, Railliet AP, Schlamp S, Garcia Y, Weber B. Large Thermal Hysteresis for Iron(II) Spin Crossover Complexes with N-(Pyrid-4-yl)isonicotinamide. Inorg Chem 2014; 53:11563-72. [DOI: 10.1021/ic501624b] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Charles Lochenie
- Inorganic Chemistry II, Universität Bayreuth, Universitätsstrasse
30, NW I, 95440 Bayreuth, Germany
- Insitute of Condensed Matter
and Nanosciences, Molecules, Solids and Reactivity (IMCN/MOST), Université Catholique de Louvain, Place Louis Pasteur 1, 1348 Louvain-la-Neuve, Belgium
| | - Wolfgang Bauer
- Inorganic Chemistry II, Universität Bayreuth, Universitätsstrasse
30, NW I, 95440 Bayreuth, Germany
| | - Antoine P. Railliet
- Insitute of Condensed Matter
and Nanosciences, Molecules, Solids and Reactivity (IMCN/MOST), Université Catholique de Louvain, Place Louis Pasteur 1, 1348 Louvain-la-Neuve, Belgium
| | - Stephan Schlamp
- Inorganic Chemistry II, Universität Bayreuth, Universitätsstrasse
30, NW I, 95440 Bayreuth, Germany
| | - Yann Garcia
- Insitute of Condensed Matter
and Nanosciences, Molecules, Solids and Reactivity (IMCN/MOST), Université Catholique de Louvain, Place Louis Pasteur 1, 1348 Louvain-la-Neuve, Belgium
| | - Birgit Weber
- Inorganic Chemistry II, Universität Bayreuth, Universitätsstrasse
30, NW I, 95440 Bayreuth, Germany
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23
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Fang Z, Dürholt JP, Kauer M, Zhang W, Lochenie C, Jee B, Albada B, Metzler-Nolte N, Pöppl A, Weber B, Muhler M, Wang Y, Schmid R, Fischer RA. Structural Complexity in Metal–Organic Frameworks: Simultaneous Modification of Open Metal Sites and Hierarchical Porosity by Systematic Doping with Defective Linkers. J Am Chem Soc 2014; 136:9627-36. [DOI: 10.1021/ja503218j] [Citation(s) in RCA: 209] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
| | | | | | | | - Charles Lochenie
- Anorganische
Chemie II, Universität Bayreuth, Universitätsstrasse 30, NW
I, 95440 Bayreuth, Germany
| | - Bettina Jee
- Institute
of Experimental Physics II, University of Leipzig, Ritterstrasse
26, 04109 Leipzig, Germany
| | | | | | - Andreas Pöppl
- Institute
of Experimental Physics II, University of Leipzig, Ritterstrasse
26, 04109 Leipzig, Germany
| | - Birgit Weber
- Anorganische
Chemie II, Universität Bayreuth, Universitätsstrasse 30, NW
I, 95440 Bayreuth, Germany
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24
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Göbel C, Palamarciuc T, Lochenie C, Weber B. Synthesis of Microcrystals of the [Fe(L)(bipy)] Spin Crossover Coordination Polymer in a Poly-4-vinylpyridine Matrix. Chem Asian J 2014; 9:2232-8. [DOI: 10.1002/asia.201402144] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Indexed: 11/08/2022]
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25
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Lochenie C, Schlamp S, Railliet AP, Robeyns K, Weber B, Garcia Y. Water channels and zipper structures in Schiff base-like Cu(ii) and Ni(ii) mononuclear complexes. CrystEngComm 2014. [DOI: 10.1039/c4ce00710g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Affiliation(s)
- Wolfgang Bauer
- Inorganic Chemistry II, Universität Bayreuth, Universitätsstraße 30, NW I, 95440 Bayreuth, Germany.
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27
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Lochenie C, Bauer W, Schlamp S, Thoma P, Weber B. Synthesis and Characterisation of Schiff Base-like Iron(II) Complexes with Imidazole as Axial Ligand. Z Anorg Allg Chem 2011. [DOI: 10.1002/zaac.201100424] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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