MICHALOWICZ, Alain; MOSCOVICI, Jacques; KAHN, Olivier

doi:10.1051/jp4/1997124

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MICHALOWICZ, Alain
Laboratoire de Physique des Milieux Denses [LPMD]
Laboratoire pour l'utilisation du rayonnement électromagnétique [LURE]

MOSCOVICI, Jacques
Laboratoire de Physique des Milieux Denses [LPMD]

KAHN, Olivier
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal de Physique IV Proceedings. 1997-04, vol. 7, n° C2, p. 633-635

EDP Sciences

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Fe(II) triazole derivatives are spin cross-over compounds with various Tc (-30->+150 °C), large thermal hysteresis (dTc à peu près égal à 50 K) and an important thermochromic effect. These promising properties, which are already used in experimental imaging and memory devices, are probably due to their polymeric structures. We have studied these structures by EXAFS and X-Ray diffraction (in spite of the important long distance disorder observed). The key result of this study is the alignment of a long chain of Fe(II) ions in the Low Spin (LS) state of the polymeric species, proved by the presence of a characteristic double Fe-Fe distance multiple scattering EXAFS signal (analysed by FEFF code). New results have been obtained recently on new members of the Fe(II) triazole familly and nickel glyoxime model compounds presenting similar dependence of the multiple-scattering signal amplitude were performed in order to explain the apparent vanishing of the alignment in the High Spin (HS) state.< Leer menos

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Polymer

Fe(II)

Spin crossover

XAS

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Polymeric Fe(II) spin cross over compounds : XAS structural results

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