TAILLEUR, Élodie; MARCHIVIE, Mathieu; ITIÉ, Jean-Paul; ROSA, Patrick; DARO, Nathalie; GUIONNEAU, Phillippe

doi:10.1002/chem.201802828

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TAILLEUR, Élodie
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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

ITIÉ, Jean-Paul
Synchrotron SOLEIL [SSOLEIL]

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Chemistry - A European Journal. 2018, vol. 24, n° 54, p. 14495–14499

Wiley-VCH Verlag

Résumé en anglais

An accurate high‐pressure X‐ray diffraction investigation, at various temperatures, on a powder of a spin‐crossover (SCO) complex has allowed the rare deconvolution of the structural features of the high‐spin and low‐spin phases. As a result, the pressure dependence of the structural parameters of the high‐spin and low‐spin phases can be discussed independently in the pressure domain where both phases co‐exist within the powder. Consequently, crucial unprecedented information is given, such as the variation of bulk moduli with temperature, similar here in amplitude for both spin phases, the temperature‐dependence of the pressure‐induced SCO abruptness, the temperature dependence of the pressure at which SCO occurs, and arguments for a possible piezo‐hysteresis. Performed on the molecular complex [Fe(PM‐PeA)2(NCSe)2] (PM‐PeA=N‐(2′‐pyridylmethylene)‐4‐(phenylethynyl) aniline), this study reveals a pressure‐induced SCO at 0.16 GPa and demonstrates that, when increasing temperature, the pressure of transition increases linearly, the abruptness of the pressure‐induced SCO strongly increases, and the bulk moduli decrease.< Réduire

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bulk modulus

high pressure

powder diffraction

Rietveld refinement

spin-crossover

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Pressure‐induced spin‐crossover features at variable temperature revealed by in situ synchrotron powder x‐ray diffraction

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