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Synthesis and Crystal Structure of Cobalt(III) Chelate with Tridentate Azomethine Ligand Containing a Benzimidazole Moiety

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Abstract

Azomethine HL was synthesized by the reaction of o-aminophenol with 2-acetylbenzimidazole and used to prepare the cobalt(III) complex [CoL2]2(ClO4)2⋅3H2O (I). The structure of complex I was established by NMR spectroscopy in solution and by single crystal X-ray diffraction (CIF file CCDC no. 2051279). The cobalt ion in the +3 oxidation state has an octahedral environment. The crystals are monoclinic, space group C2/c, a = 12.405(7), b = 13.946(11), c = 18.907(13) Å, α = 109.87(3)°, β = 94.534(12)°, γ = 104.564(19)°, V = 2928(3) Å3, ρ(calcd.) = 1.521 g/cm 3, Z = 2. The complex is diamagnetic. Study of the electrochemical behavior of I in acetonitrile showed that it can be reduced to neutral and radical anion forms.

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ACKNOWLEDGMENTS

X-ray diffraction analysis and magnetic measurements were performed using equipment of the Center for Collective Use of Physical Methods of Investigation, Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, which is supported by the state assignment for the Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, in the field of fundamental research.

Funding

NMR studies were carried out using the equipment of the Center for Molecular Structure Studies, Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, and was supported by the Russian Science Foundation (grant no. 20-73-00194).

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Authors and Affiliations

  1. Southern Federal University, Rostov-on-Don, Russia

    L. D. Popov, S. A. Borodkin, V. V. Chernyavina & I. N. Shcherbakov

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

    M. A. Kiskin

  3. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russia

    A. A. Pavlov

  4. Research Institute of Physical and Organic Chemistry, Southern Federal University, Rostov-on-Don, Russia

    P. A. Knyazev

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  1. L. D. Popov
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  2. S. A. Borodkin
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  3. M. A. Kiskin
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  4. A. A. Pavlov
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  5. P. A. Knyazev
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  6. V. V. Chernyavina
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  7. I. N. Shcherbakov
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Correspondence to L. D. Popov.

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Translated by Z. Svitanko

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Popov, L.D., Borodkin, S.A., Kiskin, M.A. et al. Synthesis and Crystal Structure of Cobalt(III) Chelate with Tridentate Azomethine Ligand Containing a Benzimidazole Moiety. Russ J Coord Chem 48, 9–15 (2022). https://doi.org/10.1134/S1070328421110038

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