GARCIA, Yann; MOSCOVICI, Jacques; MICHALOWICZ, Alain; KSENOFONTOV, Vadim; LEVCHENKO, Georg; BRAVIC, Georges; CHASSEAU, Daniel; GÜTLICH, Philipp

doi:10.1002/1521-3765(20021104)8:21<4992::AID-CHEM4992>3.0.CO;2-8

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GARCIA, Yann
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Insitut für Anorganische und Analytische Chemie

MOSCOVICI, Jacques
Laboratoire d'Utilisation du Rayonnement Electromagnétiques
Physique des Milieux Denses

MICHALOWICZ, Alain
Laboratoire d'Utilisation du Rayonnement Electromagnétiques
Physique des Milieux Denses

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Chemistry - A European Journal. 2002, vol. 8, n° 21, p. 4992-5000

Wiley-VCH Verlag

Résumé en anglais

[Fe(hyptrz)3](4-chloro-3-nitrophenylsulfonate)22 H2O (1; hyptrz=4-(3-hydroxypropyl)-1,2,4-triazole) has been synthesized and its physical properties have been investigated by several physical techniques including magnetic susceptibility measurements, calorimetry, and Mössbauer, optical, and EXAFS spectroscopy. Compound 1 exhibits a spin transition below room temperature, together with a very wide thermal hysteresis of about 50 K. This represents the widest hysteresis loop ever observed for an FeII-1,2,4-triazole spin transition material. The cooperativity is discussed on the basis of temperature-dependent EXAFS studies and of the structural features of a CuII analogue. The EXAFS structural model of (1) in both spin states is compared to that obtained for a related material whose spin transition occurs above room temperature. EXAFS spectroscopy suggests that 1,2,4-triazole chain compounds retain a linear character whatever the spin state of the iron(II).< Réduire

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EXAFS spectroscopy

Iron

Spin crossover

4-triazole

Chain structures

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A spin transition molecular material with a wide bistability domain.

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