Pressure-Tuning of Magnetism and Linkage Isomerism in Iron(II) Hexacyanochromate

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□1.2·16H2O (1). Upon application of pressure in the 0−1200 MPa range, the cyanide ligand rotates and becomes C-bonded to...

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Detalhes bibliográficos
Autores: Giménez López, María del Carmen, Coronado, Eugenio, Levchenko, Georgiy, Romero, Francisco, Garcia Baonza, Valentin, Milner, Alla, Paz Pasternak, Moshe
Tipo de documento: artigo
Data de publicação:2005
País:España
Recursos:Universidad de Santiago de Compostela (USC)
Repositório:Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
Idioma:inglês
OAI Identifier:oai:minerva.usc.gal:10347/32224
Acesso em linha:http://hdl.handle.net/10347/32224
Access Level:Acceso aberto
Palavra-chave:2303 Química inorgánica
Descrição
Resumo: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□1.2·16H2O (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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