DJEMEL, Abdelhak; STEFÁNCZYK, Olaf; MARCHIVIE, Mathieu; TRZOP, Elzbieta; COLLET, Eric; DESPLANCHES, Cédric; DELIMI, Rachid; CHASTANET, Guillaume

doi:10.1002/chem.201802572

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DJEMEL, Abdelhak
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire de traitement des eaux et valorisation des déchets industriels [LTEVDI]

STEFÁNCZYK, Olaf
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

MARCHIVIE, Mathieu
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Article de revue

Ce document a été publié dans

Chemistry - A European Journal. 2018-10-01, vol. 24, n° 55, p. 14760-14767

Wiley-VCH Verlag

Résumé en anglais

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.< Réduire

Mots clés en anglais

spin crossover

solvatomorphism

phase transition

hysteresis

aurophilic interactions

coordination chemistry

DOI

http://dx.doi.org/10.1002/chem.201802572

Project ANR

Etude femtoseconde rayons X et optique de la dynamique ultrarapide de photocommutation de matériaux moléculaires magnétiques
Bistabilité magnétique dans de nouveaux systèmes moléculaires à base de ligands anioniques pontants

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026