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 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.
Coronado
Eugenio
E
Institut de Ciència Molecular, Universitat de València, Dr. Moliner 50, 46100 Burjassot, Spain.
Giménez-López
Mari Carmen
MC
Levchenko
Georgiy
G
Romero
Francisco M
FM
García-Baonza
Valentín
V
Milner
Alla
A
Paz-Pasternak
Moshe
M