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Iron(II) and Cobalt(II) Complexes with 2,6-Bis(1,4-Diphenyl-5-Hydroxy-1H-Pyrazol-3-yl)pyridine: Synthesis, Structures, and Spin States

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Abstract

The reactions of 2,6-bis(1,4-diphenyl-5-hydroxy-1H-pyrazol-3-yl)pyridine (L), which is the first representative of a series of 2,6-bis(pyrazol-3-yl)pyridine ligands bearing substituents in positions 1 and 4 of the pyrazol-3-yl ring, with the divalent iron and cobalt salts afford new Со(II) and Fe(II) complexes: [Co(L)2](ClO4)2 (I) and [Fe(L)2](ClO4)2 (II). The compounds are isolated in the individual state and characterized by elemental analysis, NMR spectroscopy, and X-ray diffraction analysis (CIF files CCDC nos. 1967892 (I) and 1967893 (II)). According to the data obtained, the transition metal ion in complexes I and II exists in the high-spin state (S = 3/2 for Co(II) and S = 2 for Fe(II)) in a range of 120–345 K, and the proposed modification of the ligand does not lead to the temperature-induced spin transition in both the solution and crystalline state.

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ACKNOWLEDGMENTS

The XRD data were performed with the financial support from Ministry of Science and Higher Education of the Russian Federation using the equipment of Center for molecular composition studies of INEOS RAS.

Funding

This work was supported by the Russian Science Foundation, project no. 17-13-01456.

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Authors and Affiliations

  1. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991, Moscow, Russia

    I. A. Nikovskii, A. V. Polezhaev, D. Yu. Aleshin, E. K. Mel’nikova & Yu. V. Nelyubina

  2. Bauman State Technical University, 107005, Moscow, Russia

    A. V. Polezhaev

  3. Mendeleev University of Chemical Technology of Russia, 125047, Moscow, Russia

    D. Yu. Aleshin

  4. Moscow State University, 119899, Moscow, Russia

    E. K. Mel’nikova

  5. Kurchatov Institute Russian Research Center, 123182, Moscow, Russia

    P. V. Dorovatovskii

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

    Yu. V. Nelyubina

Authors
  1. I. A. Nikovskii
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  2. A. V. Polezhaev
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  3. D. Yu. Aleshin
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  4. E. K. Mel’nikova
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  5. P. V. Dorovatovskii
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  6. Yu. V. Nelyubina
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Correspondence to Yu. V. Nelyubina.

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Translated by E. Yablonskaya

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Nikovskii, I.A., Polezhaev, A.V., Aleshin, D.Y. et al. Iron(II) and Cobalt(II) Complexes with 2,6-Bis(1,4-Diphenyl-5-Hydroxy-1H-Pyrazol-3-yl)pyridine: Synthesis, Structures, and Spin States. Russ J Coord Chem 46, 317–325 (2020). https://doi.org/10.1134/S1070328420050048

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