title: Spin crossover in a tetranuclear Cr(III)-Fe(III)(3) complex.
abstract: A novel heteronuclear exchange-coupled complex [Cr(III)[(CN)Fe(III)((5)L)](3)(CN)(3)] containing a pentadentate blocking ligand (5)L was synthesized. The X-ray structure shows that a meridional isomer applies with inequivalent Fe(III) centers. The complex exhibits a thermally induced spin crossover along with the exchange coupling. Mössbauer spectra indicate a spin transition between S = (1)/(2) and S = (5)/(2) states although a considerable amount of Fe(III) centers stays high-spin at T = 6 K. The magnetization, the magnetic susceptibility, and the Mössbauer data were fitted in one run with a spin crossover model taking into account exchange interactions among all metal centers.
authors.affiliation: Departments of Inorganic and Physical Chemistry, Slovak Technical University, SK-812 37 Bratislava, Slovakia. radovan.herchel@stuba.sk
authors.forename: Radovan
authors.initials: R
authors.lastname: Herchel
authors.forename: Roman
authors.initials: R
authors.lastname: Boca
authors.forename: Milan
authors.initials: M
authors.lastname: Gembický
authors.forename: Jozef
authors.initials: J
authors.lastname: Kozísek
authors.forename: Franz
authors.initials: F
authors.lastname: Renz