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Asymmetric and symmetric cobalt(III) dioximates with pyrazinecarboxamide: Synthesis and crystal structure

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Abstract

A number of novel complexes of cobalt(III) trans-dioximates containing pyrazinecarboxamide were obtained: [CoBr(DfgH)2(Pzca)] · 0.125H2O (I), [CoCl(NioxH)2(Pzca)] (II), [CoCl(DmgH)(NioxH)(Pzca)] · 0.5C2H5OH · 0.5H2O (III), and [CoCl(DmgH)2(Pzca)] (IV), where DmgH, DfgH, and NioxH are the monoanions of dimethylglyoxime, diphenylglyoxime, and cyclohexane-1,2-dione dioxime, respectively; Pzca is pyrazinecarboxamide. Complexes I–III were examined by X-ray diffraction. In these complexes, the Co(III) atom has an octahedral environment with the pseudomacrocyclic fragment (DioxH)2 in the equatorial plane (DioxH is the α-dioxime residue). The latter is stabilized by hydrogen bonds O-H⋯O. In all the complexes, the organic ligand is monodentate and coordinated through one N atom of the heterocycle so that it is trans to the halide anion.

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Authors and Affiliations

  1. Institute of Applied Physics, Academy of Sciences of Moldova, Chisinau, Moldova

    P. Bourosh

  2. Institute of Chemistry, Academy of Sciences of Moldova, Chisinau, Moldova

    O. Ciobanica, V. Lozan & I. Bulhac

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  1. P. Bourosh
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  2. O. Ciobanica
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  3. V. Lozan
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  4. I. Bulhac
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Correspondence to P. Bourosh.

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Original Russian Text © P. Bourosh, O. Ciobanica, V. Lozan, I. Bulhac, 2012, published in Koordinatsionnaya Khimiya, 2012, Vol. 38, No. 7, pp. 484–493.

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Bourosh, P., Ciobanica, O., Lozan, V. et al. Asymmetric and symmetric cobalt(III) dioximates with pyrazinecarboxamide: Synthesis and crystal structure. Russ J Coord Chem 38, 461–470 (2012). https://doi.org/10.1134/S1070328412060036

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  • DOI: https://doi.org/10.1134/S1070328412060036

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