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Unusual Solvent Dependence of a Molecule‐Based Fe II Macrocyclic Spin‐Crossover Complex
Author(s) -
Wang Hongfeng,
Sinito Chiara,
Kaiba Abdellah,
Costa José Sanchez,
Desplanches Cédric,
Dagault Philippe,
Guionneau Philippe,
Létard JeanFrançois,
Negrier Philippe,
Mondieig Denise
Publication year - 2014
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201402666
Subject(s) - spin crossover , chemistry , metastability , molecule , spin transition , spin states , crystallography , solvent , relaxation (psychology) , spin (aerodynamics) , dehydration , quenching (fluorescence) , thermodynamics , inorganic chemistry , organic chemistry , fluorescence , social psychology , psychology , physics , quantum mechanics , biochemistry
This work illustrates in detail the reversible hydration–dehydration process of a molecule‐based material, which involves a drastic change of the switchable magnetic properties of the sample. Concretely, the complex [FeL 222 N 3 O 2 (CN) 2 ] · H 2 O exhibits a spin crossover (SCO) accompanied by a change of the coordination number. The dehydration and rehydration of this SCO complex was carried out and monitored by different methods, which include X‐ray diffraction analysis. The corresponding samples display a thermal spin transition as well as a thermal quenching of the metastable high‐spin state at low temperature. In particular it was observed that the rehydrated material exhibits a particularly high temperature of relaxation, T (TIESST), of the metastable high‐spin state. On the other hand, it was shown that this compound exhibits a uncommon correlation between T (TIESST) and the thermal SCO, as compared with other spin‐crossover compounds that do not exhibit a change in coordination number.