title: Pressure-tuning of magnetism and linkage isomerism in iron(II) hexacyanochromate.
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.
authors.affiliation: Institut de Ciència Molecular, Universitat de València, Dr. Moliner 50, 46100 Burjassot, Spain.
authors.forename: Eugenio
authors.initials: E
authors.lastname: Coronado
authors.forename: Mari Carmen
authors.initials: MC
authors.lastname: Giménez-López
authors.forename: Georgiy
authors.initials: G
authors.lastname: Levchenko
authors.forename: Francisco M
authors.initials: FM
authors.lastname: Romero
authors.forename: Valentín
authors.initials: V
authors.lastname: García-Baonza
authors.forename: Alla
authors.initials: A
authors.lastname: Milner
authors.forename: Moshe
authors.initials: M
authors.lastname: Paz-Pasternak