Solvatomorphism-Induced 45 K Hysteresis Width in a Spin-Crossover Mononuclear Compound
| Autor: | Abdelhak Djemel, Guillaume Chastanet, Rachid Delimi, Mathieu Marchivie, Eric Collet, Olaf Stefańczyk, Cédric Desplanches, Elzbieta Trzop |
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| Přispěvatelé: | Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de traitement des eaux et valorisation des déchets industriels (LTEVDI), université d'Annaba, Institut de Physique de Rennes (IPR), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), the CNRS, the University of Bordeaux, the 'Agence Nationale de la Recherche', ANR-13-BS04-0002,FEMTOMAT,Etude femtoseconde rayons X et optique de la dynamique ultrarapide de photocommutation de matériaux moléculaires magnétiques(2013), ANR-12-BS07-0030,BISTA-MAT,Bistabilité magnétique dans de nouveaux systèmes moléculaires à base de ligands anioniques pontants(2012), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2018 |
| Předmět: |
Phase transition
010402 general chemistry 01 natural sciences solvatomorphism Catalysis Coordination complex chemistry.chemical_compound spin crossover Spin crossover Metastability Phase (matter) Pyridine aurophilic interactions chemistry.chemical_classification 010405 organic chemistry Organic Chemistry [CHIM.MATE]Chemical Sciences/Material chemistry General Chemistry 0104 chemical sciences Crystallography Hysteresis hysteresis chemistry phase transition coordination chemistry [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Crystal twinning |
| Zdroj: | Chemistry-A European Journal Chemistry-A European Journal, 2018, 24 (55), pp.14760-14767. ⟨10.1002/chem.201802572⟩ Chemistry-A European Journal, Wiley-VCH Verlag, 2018, 24 (55), pp.14760-14767. ⟨10.1002/chem.201802572⟩ |
| ISSN: | 0947-6539 1521-3765 |
| Popis: | International audience; Spin‐transition compounds are coordination complexes that can present two stable or metastable high‐spin and low‐spin states at a given temperature (thermal hysteresis). The width of the thermal hysteresis (difference between the maximum and minimum temperature between which the compound exhibits bi‐stability) depends on the interactions between the coordination complexes within the compound, and which may be modulated by the absence or presence of solvent within the structure. The new compound [Fe(3‐bpp)2][Au(CN)2]2 (1, 3‐bpp=2,6‐di‐(1H‐pyrazol‐3‐yl)pyridine) was synthesized and its properties were compared with those of the solvated compound [Fe(3‐bpp)2][Au(CN)2]2⋅2 H2O (1.H2O) already described. 1 has a two‐steps thermal hysteresis of 45 K, in contrast to the compound 1.H2O which exhibits a gradual conversion without hysteresis. This hysteretic transition is accompanied by a reversible reconstructive structural transition and twinning. This stepped behaviour is also observed in the photomagnetic properties despite the low efficiency of photoswitching. Single‐crystal photocrystallographic investigations confirm this low conversion, which we attributed to the high energy cost to form the high‐spin structure, whose symmetry differs from that of the low‐spin phase. |
| Databáze: | OpenAIRE |
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