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Spin-crossover in complexes of iron(II) carboranes with tris(pyrazol-1-yl)methane |
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| Authors: | O G Shakirova V A Daletskii L G Lavrenova V A Varnek D A Rudakov V I Potkin |
| Institution: | 1. Komsomolsk-on-Amur State Technical University, Komsomolsk, Russia 2. A. V. Nikolaev Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences, Novosibirsk, Russia 3. Novosibirsk State University, Novosibirsk, Russia 4. Institute of Physico-Organic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus |
| 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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