Article
Chemistry, Inorganic & Nuclear
Patroula Gkolfi, Dimitra Tsivaka, Ioannis Tsougos, Katerina Vassiou, Ondrej Malina, Michaela Polaskova, Christina D. Polyzou, Christos T. Chasapis, Vassilis Tangoulis
Summary: The reverse micelle method was used to synthesize water-soluble silica hybrid, spin-crossover nanoparticles, showing potential as smart MRI agents based on temperature-dependent T2 values from MRI experiments. Lyophilization of the nanoparticle dispersions in water resulted in powders with preserved but modified thermal hysteretic magnetic profiles.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Inorganic & Nuclear
Kai-Ping Xie, Si-Guo Wu, Long-Fei Wang, Guo-Zhang Huang, Zhao-Ping Ni, Ming-Liang Tong
Summary: Two new two-dimensional coordination polymers have been constructed, with compound 1 exhibiting spin-crossover behavior under normal atmospheric pressure and compound 2 showing paramagnetic behavior at measured temperatures. The fine-tuning of the monodentate ligand can modulate the ligand field and packing fashions, providing insights for developing new spin-crossover materials.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Multidisciplinary
Oleksandr Ye Horniichuk, Karl Ridier, Gabor Molnar, Volodymyr O. Kotsyubynsky, Sergiu Shova, Vladimir M. Amirkhanov, Il'ya A. Gural'skiy, Lionel Salmon, Azzedine Bousseksou
Summary: Solvatomorphism and polymorphism play a crucial role in defining the characteristics of spin crossover in coordination compounds. This paper presents a detailed characterization of the spin crossover bis[hydrotris(1,2,3-triazol-1-yl)borate]iron(II) complex. Different solvatomorphs were obtained through recrystallization, and their thermal properties and spin crossover behavior were investigated using various analytical techniques. Dehydration experiments also revealed structural phase transitions upon heating.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Raul Diaz-Torres, Silvia Gomez-Coca, Eliseo Ruiz, Phimphaka Harding, David J. Harding
Summary: A family of heteroleptic spin crossover (SCO) complexes have been synthesized, and their spin transition properties vary with temperature. The magnetic properties of these complexes are significantly improved by slight changes in crystal packing, which enhance the cooperativity.
DALTON TRANSACTIONS
(2023)
Article
Biochemistry & Molecular Biology
Olga G. Shakirova, Irina A. Os'kina, Evgeniy V. Korotaev, Sergey A. Petrov, Natalia V. Kuratieva, Alexsei Ya. Tikhonov, Lyudmila G. Lavrenova
Summary: New iron(II) complexes with 2,6-bis(1H-imidazol-2-yl)-4-methoxypyridine (L) as the ligand have been synthesized and studied. The coordination ability of the ligand was determined through analysis of a copper(II) complex by X-ray technique. The compounds I-III exhibit a (1)A(1) & LRARR; T-5(2) spin crossover, accompanied by thermochromism.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Inorganic & Nuclear
Kai-Ping Xie, Ze-Yu Ruan, Xiao-Xian Chen, Jiong Yang, Si-Guo Wu, Zhao-Ping Ni, Ming-Liang Tong
Summary: In this study, a 3D Hofmann-type metal-organic framework with incomplete two-step spin crossover behavior was reported. Photomagnetic measurements revealed a rare bidirectional light-induced excited spin-state trapping effect at low temperature, providing a new approach for designing optomagnetic memory devices.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Review
Chemistry, Inorganic & Nuclear
Bijoy Dey, Vadapalli Chandrasekhar
Summary: This review focuses on spin crossover phenomena, particularly in Fe-II complexes in the N4O2 coordination environment. It discusses three ligand families: Jager-type ligands, hydrazone-based ligands, and tridentate ligands with salicylaldehyde derivatives. It explores the assembly of mononuclear and multinuclear complexes, as well as the coupling of optical and magnetic properties.
DALTON TRANSACTIONS
(2022)
Review
Chemistry, Inorganic & Nuclear
Ke Sun, Jin-Peng Xue, Zi-Shuo Yao, Jun Tao
Summary: In this perspective, we briefly review the main synthetic strategies and progresses in fluorescent spin-crossover (SCO) materials in the last twenty years, emphasizing the promising applications of fluorescent SCO bifunctional materials in magneto-optical switching and information processing.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Cyril Rajnak, Romana Micova, Jan Moncol, Lubor Dlhan, Christoph Krueger, Franz Renz, Roman Boca
Summary: The iron(iii) mononuclear complex [Fe(Cl-3,Cl-5-L)(NCSe)] exhibits a thermally induced spin crossover with a broad hysteresis width, showing different spin states at different temperatures. Analogous complexes of the [Fe(X-3,X-5-L)(Y)] type are high-spin over the whole temperature interval.
DALTON TRANSACTIONS
(2021)
Article
Physics, Applied
Ionela Rusu, Ioan Cozmin Manolache-Rusu, Andrei Diaconu, Oleg Palamarciuc, Il'ya A. Gural'skiy, Gabor Molnar, Aurelian Rotaru
Summary: The study investigated the impact of non-hydrostatic pressure on hysteretic spin crossover in coordination complexes. By introducing a double distribution of interactions and gap energy, the major hysteresis loop and FORC diagram were successfully generated for spin-crossover systems. Interestingly, the FORC diagram method appears to be more sensitive to local changes than bulk parameters, showing asymmetric thermal hysteresis loop under high pressure gradients.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Mario Palacios-Corella, Javier Ramos-Soriano, Manuel Souto, Duarte Ananias, Joaquin Calbo, Enrique Orti, Beatriz M. Illescas, Miguel Clemente-Leon, Nazario Martin, Eugenio Coronado
Summary: This study designed and synthesized a family of hexakis-substituted [60]fullerene adducts with a well-known ligand for spin-crossover systems. Experimental and theoretical evidence showed that these molecular scaffolds can form polynuclear SCO complexes in solution, and retain SCO properties in the solid state.
Article
Chemistry, Multidisciplinary
Weiyang Li, Cuilian Liu, Joseph Kfoury, Julianna Olah, Koen Robeyns, Michael L. Singleton, Serhiy Demeshko, Franc Meyer, Yann Garcia
Summary: A Fe-II based supramolecular cage with pyridyl-hydrazone ligand scaffolds displaying temperature induced spin crossover behavior was reported, and density functional theory calculations were used to investigate the cause of this phenomenon based on the ligand structure. The results suggest that low-spin cages with pyridyl-imine sites could potentially undergo spin crossover when carefully manipulating the functional groups in the ligand system.
CHEMICAL COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
S. B. Ogou, T. D. Oke, F. Hontinfinde, K. Boukheddaden
Summary: Spin-crossover and Prussian blue-like materials in two dimensions were investigated using a three-state model, showing finite-size effects and the thermal distortion effect on the thermal spin transition at finite temperature. Numerical results from two-step Monte Carlo simulations allowed the establishment of a rich phase diagram, observing gradual and first-order transitions with thermally induced hysteresis phenomena.
Article
Chemistry, Physical
Daniel Vidal, Jordi Cirera, Jordi Ribas-Arino
Summary: Exploring the chemical space of a ligand and modulating its ligand field strength is an effective strategy for fine-tuning the physical properties of spin-crossover complexes. This computational study investigates how ligand substituent effects can modulate the transition temperature (T-1/2) in Fe(iii) SCO systems and identifies suitable descriptors for predicting these changes. The study provides insights into the design of new SCO systems with specific T-1/2 values based on ligand design.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Lee T. Birchall, Amber T. Raja, Lewis Jackson, Helena J. Shepherd
Summary: To improve strategies for spin-crossover material design, obtaining isostructural materials is crucial for developing and understanding structure-property relationships. In this study, we synthesized four isostructural cocrystal solvates using a specific complex and coformer. The spin-crossover properties of these materials were determined by single-crystal X-ray diffraction and were found to be influenced by the hydrogen bond basicity of the anions and solvents present.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Energy & Fuels
Morten Weiss, Gerald Hoerner, Birgit Weber, Roland Marschall
Summary: Tungsten-based defect-pyrochlores CsMxW2-xO6 are used as model oxides to investigate the high number of possible M cations that can be used to form the defect-pyrochlore crystal structure. A large variety of possible compounds are presented, several of which have been unknown so far. These compounds are used in photocatalytic hydrogen evolution to investigate possible correlations between the photocatalytic activity and the varying elemental compositions.
Article
Chemistry, Multidisciplinary
Hannah Kurz, Christian Hils, Jana Timm, Gerald Hoerner, Andreas Greiner, Roland Marschall, Holger Schmalz, Birgit Weber
Summary: Responsive fluorescent materials have great potential for sensing and imaging applications. In this study, a previously reported non-fluorescent zinc(II) complex [Zn(L)] was encapsulated into non-fluorescent polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) diblock copolymer micelles, resulting in brightly emissive materials. The quantum yield of the emission could be easily tuned by selecting the solvent, and a medium-dependent off-on sensor could be established through controlled acidification.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Karim Chkirate, Khalid Karrouchi, Hind Chakchak, Joel T. Mague, Smaail Radi, N. N. Adarsh, Weiyang Li, Ahmed Talbaoui, El Mokhtar Essassi, Yann Garcia
Summary: In this study, three new mononuclear coordination complexes were successfully synthesized and characterized using crystal structures and spectroscopic analysis. The supramolecular architectures of these complexes were investigated through crystal packing analysis, emphasizing the hydrogen bonding interactions. The in vitro evaluation demonstrated the excellent antibacterial activity of these complexes against various bacterial strains.
Article
Chemistry, Analytical
Abigail E. Reese, Charles Lochenie, Ailsa Geddis, Luana A. Machado, Marcos C. de Souza, Flavia F. C. Marques, Carlos A. de Simone, Marcos M. Gouvea, Leandro F. Pedrosa, Eufranio N. da Silva Junior, Marc Vendrell
Summary: Five new disubstituted 2,6-thioaryl-BODIPY dyes were synthesized, which exhibit unusually large Stokes shifts, making them suitable for bioimaging.
Article
Chemistry, Inorganic & Nuclear
Constantin Schreck, Johannes Weihermueller, Peter Thoma, Sabine Rosenfeldt, Markus Drechsler, Christoph Foerster, Katja Heinze, Gerald Hoerner, Birgit Weber
Summary: The aggregation behavior of an amphiphilic copper(II) complex was studied in solution using UV-Vis and EPR spectroscopy. The results showed that concentrated solutions in nonpolar media exhibited broadening of EPR-lines, which could be associated with the formation of oligomers with weak anti-ferromagnetic coupling. Electron microscopy confirmed the tendency towards supramolecular aggregation, with the formation of extended 2D sheet-like structures and 1D thread-like structures.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Andreas Duerrmann, Gerald Hoerner, Birgit Weber
Summary: In this study, the solid-state spin crossover properties of three iron(II) complexes were investigated. It was found that subtle adjustments in the outer sphere of the chelate ring resulted in different spin crossover profiles.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Analytical
Michael F. Fink, Sophie Schoenfeld, Constantin Schreck, Gerald Hoerner, Birgit Weber
Summary: Electrochemistry and its analytics play a crucial role in various scientific and technological fields, especially in studying properties related to reduction-oxidation reactions. However, there is still a lack of established methodological standards for cryo-electrochemistry at sub-zero temperatures. In this study, a reliable cryo-electrochemical setup was developed, allowing for accurate experiments at temperatures as low as -80°C. The setup combines stable temperature conditioning with gas-tight sealing of the electrochemical cell, and validation experiments demonstrated its reliability.
Article
Chemistry, Inorganic & Nuclear
Henrika M. Hueppe, Linda Iffland-Muehlhaus, Joshua Heck, Maverick Eilers, Hans Gildenast, Sophie Schoenfeld, Andreas Duerrmann, Alexander Hoffmann, Birgit Weber, Ulf-Peter Apfel, Sonja Herres-Pawlis
Summary: This study presents a synthesis route for tri(quinolin-8yl)amine (L), a member of the tetradentate tris(2-pyridylmethyl)amine (TPA) ligand family. The coordination environment of the [Fe(L)]2+ complex and the spin state can be controlled by changing the coligands. The study sheds light on the coligand competition of triflate and acetonitrile and provides insights into the influence of different coligands on the geometry and spin state of the complexes.
INORGANIC CHEMISTRY
(2023)
Editorial Material
Chemistry, Multidisciplinary
Malcolm Halcrow, Birgit Weber, Masahiro Yamashita, Sanjit Konar
CRYSTAL GROWTH & DESIGN
(2023)
Article
Biochemistry & Molecular Biology
Youssef Draoui, Smaail Radi, Mohamed El Massaoudi, Yousra Bahjou, Sabir Ouahhoud, Samira Mamri, Marilena Ferbinteanu, Redouane Benabbes, Mariusz Wolff, Koen Robeyns, Yann Garcia
Summary: Four mononuclear complexes were synthesized using a new 1,2,4-triazole ligand and the structures of the complexes were studied in relation to the cooperative effect of hydrogen bonding network and counter anions on the supramolecular formations. These compounds showed favorable antibacterial performances and significant antifungal inhibitory activity.
Article
Polymer Science
Dustin N. N. Jordan, Patrick G. G. Strassburg, Dennis Woschko, Luca M. M. Carrella, Laure P. P. Cuignet, Katharina Eickmeier, Richard Dronskowski, Yann Garcia, Eva Rentschler, Christoph Janiak
Summary: Seven new coordination networks with different structures were synthesized and investigated. The interpenetration of the networks is guided by the coordinated and non-coordinated anions. The role of different anions in the formation of the networks was explored.
Article
Biochemistry & Molecular Biology
Sebastian W. Schleser, Hindole Ghosh, Gerald Hoerner, Jonathan Seib, Sangita Bhattacharyya, Birgit Weber, Rainer Schobert, Prasad Dandawate, Bernhard Biersack
Summary: Inspired by combretastatin A-4 and N-heterocyclic carbene (NHC) complexes of Au(I), new iodidogold(I)-NHC complexes were synthesized and characterized. The synthesis involved van Leusen imidazole formation, N-alkylation, complexation with Ag2O, transmetalation, and anion exchange. The complexes were characterized by various spectroscopic techniques and one complex's structure was confirmed by X-ray diffraction. Preliminary anticancer screening showed promising activities and apoptosis induction in esophageal adenocarcinoma cells treated with the most promising derivative.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Youssef Draoui, Smaail Radi, Amine Tanan, Afaf Oulmidi, Haralampos N. Miras, Redouane Benabbes, Sabir Ouahhoudo, Samira Mamri, Aurelian Rotaru, Yann Garcia
Summary: A new pyrazole ligand was synthesized and used for the construction of a series of coordination complexes. The complexes were characterized using various techniques and their biological activities were evaluated.
Article
Materials Science, Multidisciplinary
Weiyang Li, Li Sun, Cuilian Liu, Aurelian Rotaru, Koen Robeyns, Michael L. Singleton, Yann Garcia
Summary: The design and construction of colorimetric ammonia (NH3) sensors with high selectivity, great stability, and short response times at room temperature are crucial for human health and food safety. This study presents a chiral supramolecular FeII4L4 metal-organic cage (MOC-1) that can detect NH3(g) in under 10 seconds at room temperature and was used to monitor food safety on fresh bacon bits at 4 degrees C. The MOC-1 sensor demonstrated superior selectivity among NH3(g) and twelve other analytes, and the sensing mechanism is associated with a high-spin to low-spin transition of the Fe-II ions.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Electrochemistry
Xuelian Liu, Jiande Wang, Mengyuan Du, Qi Zhu, Koen Robeyns, Xiaozhe Zhang, Varun Kumar, Jean-Francois Gohy, Yann Garcia, Alexandru Vlad
Summary: This study provides advanced insights into sodium storage by investigating an off-stoichiometric iron-rich phase. It describes an interesting electrochemical activation phenomenon that significantly enhances energy and power rate performances.
BATTERIES & SUPERCAPS
(2022)