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Journal of Structural Chemistry

2015 year, number 8

SPIN-CROSSOVER IN COORDINATION COMPOUNDS OF IRON(II) WITH tris(PYRAZOL-1-YL)METHANE AND CLUSTER ANIONS

O. G. Shakirova1, L. G. Lavrenova2,3, E. V. Korotaev2, L. A. Sheludyakova2,3, V. A. Varnek2, M. A. Shestopalov2,3, Yu. V. Mironov2,3
1Komsomolsk-on-Amur State Technical University, Komsomolsk-on-Amur, Russia
2Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
3Novosibirsk National Research State University, Novosibirsk, Russia
Keywords: координационные соединения, железо(II), трис(пиразол-1-ил)метан, октаэдрические кластерные комплексы, спин-кроссовер, термохромизм, coordination compounds, iron(II), tris(pyrazol-1-yl)methane, octahedral cluster complexes, spin-crossover, thermochromism

Abstract

Synthesis procedures for new coordination compounds of iron(II) with tris(pyrazol-1-yl)methane (HC(pz)3), containing cluster anions in the outer sphere, of the composition [Fe{HC(pz)3}2][Mo6Cl14]×2H2O (I), [Fe{HC(pz)3}2][Mo6Br14]×H2O (II), and [Fe{HC(pz)3}2]2[Re6S8(CN)6]×2H2O (III) are developed. The compounds are studied by static magnetic susceptibility, electronic, IR, and Mössbauer spectroscopic methods. The magnetochemical study shows that in the polycrystalline phases of all compounds the spin-crossover 1 А 1 Û 5 - 2 is observed which is accompanied by thermochromism.