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High-Temperature Spin Crossover in Complexes of Iron(II) closo-Borates with 2,6-Bis(benzimidazol-2-yl)pyridine

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Abstract

New iron(II) complexes with 2,6-bis(benzimidazol-2-yl)pyridine (L) and closo-borate(2–) anions—[FeL2][B10H10] ⋅ 2H2O and [FeL2][B12H12] ⋅ H2O—have been synthesized. The complexes have been characterized by static magnetic susceptibility measurements, electronic (diffuse reflectance spectra), IR, and EXAFS spectroscopy, and X-ray diffraction analysis. A study of the μeff(T) dependence in the temperature range 80–500 K has shown that the complexes exhibit a high-temperature spin crossover 1А1 ⇔ 5Т2.

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ACKNOWLEDGMENTS

We are grateful to N.P. Korotkevich for recording the X‑ray powder diffraction patterns and to I.V. Yushina for recording the diffuse reflectance spectra.

Funding

The work was partially supported by the Russian Science Foundation (project no. 20-63-46026).

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Authors and Affiliations

  1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    A. D. Ivanova, L. G. Lavrenova, E. V. Korotaev, S. V. Trubina & L. A. Sheludyakova

  2. Novosibirsk National Research State University, 630090, Novosibirsk, Russia

    L. G. Lavrenova

  3. Institute of Solid State Chemistry, Siberian Branch, Russian Academy of Sciences, 630128, Novosibirsk, Russia

    S. A. Petrov

  4. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    K. Yu. Zhizhin & N. T. Kuznetsov

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  1. A. D. Ivanova
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  2. L. G. Lavrenova
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  3. E. V. Korotaev
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  4. S. V. Trubina
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  5. L. A. Sheludyakova
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  6. S. A. Petrov
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  7. K. Yu. Zhizhin
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  8. N. T. Kuznetsov
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Correspondence to L. G. Lavrenova.

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Translated by G. Kirakosyan

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Ivanova, A.D., Lavrenova, L.G., Korotaev, E.V. et al. High-Temperature Spin Crossover in Complexes of Iron(II) closo-Borates with 2,6-Bis(benzimidazol-2-yl)pyridine. Russ. J. Inorg. Chem. 65, 1687–1694 (2020). https://doi.org/10.1134/S0036023620110078

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