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Hexaaquacobalt(II) and hexaaquacadmium(II) 4-nitro-2,3,5,6-tetraoxopyridinates [M(H2O)6](C5HN2O6)2 · 2H2O (M = Co and Cd): Synthesis, structures, and properties

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Abstract

The complexes [Cd(H2O)6](C5HN2O6)2 · 2H2O (I) and [Co(H2O)6](C5HN2O6)2 · 2H2O (II) were obtained in the crystalline state by reactions of cobalt chloride and cadmium chloride with ammonium 4-nitro-2,3,5,6-tetraoxopyridinate, (NH4)2 · (C5HO6N2)2. Their cocrystallization gave the heterometallic complex [Cd0.32Co0.68(H2O)6](C5HN2O6)2 · 2H2O (III). The crystal and molecular structures of complexes I-III were determined by X-ray diffraction. It was demonstrated that the complexation reactions occur by replacement of two ammonium cations 4-nitro-2,3,5,6-tetraoxopyridinate by the complex cations [M(H2O)6]2+. The tetraoxopyridinate anions and the complex cations are hydrogen-bonded through the coordinated and crystallization water molecules as well as through the O atoms of the organic anion. The thermolysis of complexes I and II was examined by TGA.

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Authors and Affiliations

  1. Peoples Friendship University, ul. Miklukho-Maklaya 6, Moscow, Russia

    O. V. Kovalchukova, Dinh Do Nguyen & S. B. Strashnova

  2. Karpov Research Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, Russia

    A. I. Stash & V. K. Bel’skii

Authors
  1. O. V. Kovalchukova
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  2. A. I. Stash
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  3. Dinh Do Nguyen
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  4. S. B. Strashnova
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  5. V. K. Bel’skii
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Correspondence to O. V. Kovalchukova.

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Original Russian Text © O.V. Kovalchukova, A.I. Stash, Dinh Do Nguyen, S.B. Strashnova, V.K. Bel’skii, 2013, published in Koordinatsionnaya Khimiya, 2013, Vol. 39, No. 3, pp. 136–140.

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Kovalchukova, O.V., Stash, A.I., Do Nguyen, D. et al. Hexaaquacobalt(II) and hexaaquacadmium(II) 4-nitro-2,3,5,6-tetraoxopyridinates [M(H2O)6](C5HN2O6)2 · 2H2O (M = Co and Cd): Synthesis, structures, and properties. Russ J Coord Chem 39, 234–238 (2013). https://doi.org/10.1134/S1070328413030044

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  • DOI: https://doi.org/10.1134/S1070328413030044

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