Pressure-Tuning of Magnetism and Linkage Isomerism in Iron(II) Hexacyanochromate
Journal of the American Chemical Society2005Vol. 127(13), pp. 4580–4581
Citations Over TimeTop 10% of 2005 papers
Eugenio Coronado, M.C. Gimenez-Lopez, G. G. Levchenko, Francisco M. Romero, Valentı́n G. Baonza, A. P. Milner, Moshe Paz-Pasternak
Abstract
A pressure-induced linkage isomerization of the cyanide anion has been observed in single crystals of a chromium(III)-iron(II) Prussian blue analogue of formula K0.4Fe4[Cr(CN)6]2.8 square1.2.16H2O (1). Upon application of pressure in the 0-1200 MPa range, the cyanide ligand rotates and becomes C-bonded to the iron(II) cations, leading to a stabilization of their diamagnetic low-spin states. The result is a decrease of magnetization and magnetic ordering temperatures from TC = 19 K at ambient pressure to 13 K at 1200 MPa. The initial magnetic properties can be restored on pressure release. The reversible movement of cyanide in the solid state can be exploited as a switch of the magnetic interaction at the molecular level.
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