Abstract
Synthesis procedures for coordination compounds of iron(II) 1,5,6,10-tetra(R)-7,8-dicarba-nido-undecaborates(-1) (carboranes) with tris(pyrazol-1-yl)methane (HC(pz)3) of the composition [Fe{HC(pz)3}2]A2·nH2O (A = (7,8-C2B9H12)− (I), (1,5,6,10-Br4-7,8-C2B9H8)− (II), (1,5,6,10-I4-7,8-C2B9H8)− (III), n = 0–2) are developed. The compounds are studied by static magnetic susceptibility in the temperature range of 160–500 K, electron (diffuse reflectance spectra), IR, and Mössbauer spectroscopy methods. It is shown that the complexes have high-temperature spin-crossover 1 A 1 ⇔ 5 T 2. Transition temperatures (T c) for I–III are 370 K, 380 K, and 400 K respectively. Spin-crossover is accompanied by thermochromism (color change: pink ⇔ white).
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Original Russian Text © 2014 O. G. Shakirova, V. A. Daletskii, L. G. Lavrenova, V. A. Varnek, D. A. Rudakov, V. I. Potkin.
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Translated from Zhurnal Strukturnoi Khimii, Vol. 55, No. 1, pp. 50–57, January–February, 2014.
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Shakirova, O.G., Daletskii, V.A., Lavrenova, L.G. et al. Spin-crossover in complexes of iron(II) carboranes with tris(pyrazol-1-yl)methane. J Struct Chem 55, 45–52 (2014). https://doi.org/10.1134/S0022476614010077
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DOI: https://doi.org/10.1134/S0022476614010077