Unusual Solvent Dependence of a Molecule‐Based Fe II  Macrocyclic Spin‐Crossover Complex | Zendy

Wang Hongfeng | Zendy; Sinito Chiara | Zendy; Kaiba Abdellah | Zendy; Costa José Sanchez | Zendy; Desplanches Cédric | Zendy; Dagault Philippe | Zendy; Guionneau Philippe | Zendy; Létard JeanFrançois | Zendy; Negrier Philippe | Zendy; Mondieig Denise | Zendy

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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.

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