Ivanova, A. D.;
Lavrenova, L. G.;
Korotaev, E. V.;
Trubina, S. V.;
Tikhonov, A. Ya.;
Kriventsov, V. V.;
Petrov, S. A.;
Zhizhin, K. Yu.;
Kuznetsov, N. T.
Study of Spin-Crossover in Iron(II) Complexes with 2,6-Bis(4,5-Dimethyl-1H-Imidazol-2-yl)Pyridine and closo-Borate Anions
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Media type:
E-Article
Title:
Study of Spin-Crossover in Iron(II) Complexes with 2,6-Bis(4,5-Dimethyl-1H-Imidazol-2-yl)Pyridine and closo-Borate Anions
Contributor:
Ivanova, A. D.;
Lavrenova, L. G.;
Korotaev, E. V.;
Trubina, S. V.;
Tikhonov, A. Ya.;
Kriventsov, V. V.;
Petrov, S. A.;
Zhizhin, K. Yu.;
Kuznetsov, N. T.
imprint:
Pleiades Publishing Ltd, 2022
Published in:Russian Journal of Inorganic Chemistry
Description:
<jats:sec><jats:title>Abstract</jats:title><jats:p>New iron(II) coordination compounds with 2,6-bis(4,5-dimethyl-1<jats:italic>H</jats:italic>-imidazol-2-yl)pyridine (L) and<jats:italic>closo</jats:italic>-borate(2–) anions [FeL<jats:sub>2</jats:sub>]B<jats:sub>10</jats:sub>H<jats:sub>10</jats:sub>⋅2H<jats:sub>2</jats:sub>O and [FeL<jats:sub>2</jats:sub>]B<jats:sub>12</jats:sub>H<jats:sub>12</jats:sub>⋅H<jats:sub>2</jats:sub>O have been synthesized. The compounds have been identified and studied by CHN analysis, electron spectroscopy (diffuse reflection spectroscopy), IR, Mössbauer, and EXAFS spectroscopies, X-ray powder diffraction, and static magnetic susceptibility. The structures of the coordination knots of complexes [FeL<jats:sub>2</jats:sub>]B<jats:sub>10</jats:sub>H<jats:sub>10</jats:sub>⋅2H<jats:sub>2</jats:sub>O and [FeL<jats:sub>2</jats:sub>]B<jats:sub>12</jats:sub>H<jats:sub>12</jats:sub>⋅H<jats:sub>2</jats:sub>O has been obtained by modeling the EXAFS spectra. The ligand is coordinated by the iron(II) ion in a tridentate-cyclic manner by two nitrogen atoms of imidazole cycles and a nitrogen atom of pyridine to form the FeN<jats:sub>6</jats:sub>coordination knot. The study of the temperature dependence of the magnetic susceptibility in the range of 80–500 K has showed that the high-temperature spin-crossover<jats:sup>1</jats:sup><jats:italic>А</jats:italic><jats:sub>1</jats:sub>↔<jats:sup>5</jats:sup><jats:italic>Т</jats:italic><jats:sub>2</jats:sub>manifests itself in the obtained compounds.</jats:p></jats:sec>