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Issue 15, 2012
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High-pressure spin-crossover in a dinuclear Fe(ii) complex

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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.

Graphical abstract: High-pressure spin-crossover in a dinuclear Fe(ii) complex

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Article information

09 Dec 2011
15 Feb 2012
First published
08 Mar 2012

Phys. Chem. Chem. Phys., 2012,14, 5265-5271
Article type

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

H. J. Shepherd, P. Rosa, L. Vendier, N. Casati, J. Létard, A. Bousseksou, P. Guionneau and G. Molnár, Phys. Chem. Chem. Phys., 2012, 14, 5265
DOI: 10.1039/C2CP23940J

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