SHEPHERD, Helena; ROSA, Patrick; VENDIER, Laure; CASATI, Nicola; LÉTARD, Jean-François; BOUSSEKSOU, Azzedine; GUIONNEAU, Philippe; MOLNÁR, Gábor

doi:10.1039/c2cp23940j

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SHEPHERD, Helena
Department of Chemistry

ROSA, Patrick
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

VENDIER, Laure
Laboratoire de chimie de coordination [LCC]

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Physical Chemistry Chemical Physics. 2012, vol. 14, n° 15, p. 5265-5271

Royal Society of Chemistry

Résumé en anglais

The effect of pressure on the dinuclear spin crossover material [{Fe(bpp)(NCS)(2)}(2)(4,4'-bipy)]*2MeOH (where bpp = 2,6-bis(pyrazol-3-yl)pyridine and 4,4'-bipy = 4,4'-bipyridine, 1) has been investigated with single crystal X-ray diffraction and Raman spectroscopy using diamond anvil cell techniques. The very gradual pressure-induced spin crossover occurs between 7 and 25 kbar, and shows no evidence of crystallographic phase transitions. The pressure-induced spin transition leads to a complete LS state which is not thermally accessible. This structural evolution under pressure is in stark contrast to the previously reported thermal spin crossover behaviour, in which a symmetry-breaking, purely structural phase transition results in only partial conversion to the low spin state. This observation is attributed to the symmetry-breaking phase transition becoming unfavourable under pressure.< Réduire

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Molecular materials

Spin crossover

High pressure

Iron

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High-pressure spin-crossover in a dinuclear Fe(ii) complex.

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