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Structures of Copper(II) N-tert-Butylbenzoyl and N-Phenylpivaloyl Hydroxamates in the Crystalline State and in a Frozen Solution

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Abstract

The geometric structures of compounds CuL2 (L = R1N(O)–(O)CR2; R1 = tert-Bu, R2 = Ph (I) and R1 = Ph, R2 = tert-Bu (II)) are studied by X-ray diffraction analysis (XRD) in the crystalline state and by stationary EPR spectroscopy in a dichloromethane solution. According to the XRD data (CIF files CCDC nos. 1875367 and 2022310, respectively), in the crystalline state the copper atoms of both complexes exist in the planar-square environment of the oxygen atoms with the trans-coordination of the hydroxamate ligands. According to the EPR data for frozen solutions of the complexes in dichloromethane, the compounds coexist as two mononuclear forms A and B differed in magnetic resonance parameters. It is shown that compound IB forms aggregates when freezing the solution. The form B of compound II is an associate of the copper complex with the solvent molecules. The EPR data indicate that both forms of compounds I and IIA form no associates with the solvent molecules.

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This work was carried out in terms of state assignment of the Kurnakov Institute of General and Inorganic Chemistry (Russian Academy of Sciences) in the area of basic research.

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Correspondence to N. N. Efimov.

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Translated by E. Yablonskaya

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Rotov, A.V., Yakushev, I.A., Ugolkova, E.A. et al. Structures of Copper(II) N-tert-Butylbenzoyl and N-Phenylpivaloyl Hydroxamates in the Crystalline State and in a Frozen Solution. Russ J Coord Chem 47, 376–381 (2021). https://doi.org/10.1134/S1070328421060051

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