Spin crossover in the coordination compounds of iron(II) with tris(3,5-dimethylpyrazol-1-yl)methane

L. G. Lavrenova, A. D. Strekalova, A. V. Virovets, D. A. Piryazev, V. A. Daletskii, L. A. Sheludyakova, T. F. Mikhailovskaya, S. F. Vasilevskii

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Abstract

Iron(II) complexes with tris(3,5-dimethylpyrazol-1-yl)methane {HC(3,5-Me 2Pz) 3} of the composition [Fe{HC(3,5-Me 2Pz) 3} 2]A m • nH 2O (A = Cl - (I), ClO4 (II), SO 2- 4 (III), CF3SO3 (IV), m = 1, 2, n = 0.1) are synthesized. The compounds are studied by static magnetic susceptibility, IR and diffuse reflectance spectroscopy, and X-ray structure analysis. The crystal structures of two polymorphous modifications of the [Fe{HC(3,5-Me 2Pz) 3} 2](ClO 4) 2 (IIa and IIb) and [Fe{HC(3,5-Me 2Pz) 3} 2](CF 3SO 3) 2 (IV) complexes are determined. The temperature dependence (J. eff(T) shows that the spin crossover 1A1 5T 2 is observed in the polycrystalline phase of complex I and in one of the single-crystal phases of complex II (IIa) and is accompanied by thermochromism (the change of the dark pink color to white).

Original languageEnglish
Pages (from-to)507-514
Number of pages8
JournalRussian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya
Volume38
Issue number8
DOIs
Publication statusPublished - 1 Aug 2012
Externally publishedYes

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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