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Synthesis and Study of Heterometallic Co–Bi Compounds Based on Ethylenediaminetetraacetic Acid. Crystal and Molecular Structures of [Co(DH)2(o-NH2C6H4CH3)2]2[Bi2(μ-Edta)2(H2O)2] · 10H2O (DH2 is dimethylglyoxime)

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Abstract

Compounds of the [Co(DH)2A2](BiEdta) · 6H2O type (where DH is the monodeprotonated dimethylglyoxime –ON=C(CH3)–(CH3)C=NOH; A is the o-, m-, or p-toluidine; and Edta is the ethylenediaminetetraacetate(4–) ion) were synthesized and studied. The composition and structures of the complexes were determined from their UV and 1H NMR spectra and from X-ray diffraction data. The isomer [Co(DH)2(o-NH2C6H4CH3)2]2[Bi2(μ-Edta)2(H2O)2] · 10H2O was structurally characterized using X-ray diffraction analysis. The crystals are triclinic: a = 12.153(2) Å, b = 12.824(3) Å, c = 16.215(3) Å, α = 67.73(3)°, β = 86.18(3)°, γ = 66.96(3)°, space group P \(\overline 1\), ρ(calcd) = 1.719 g/cm3, Z = 4. The structure is composed of complex binuclear [Bi2(μ-Edta)2(H2O)2]2– anions, [Co(DH)2(o-NH2C6H4CH3)2]+ cations, and molecules of crystallization water. The Edta4– anion chelates with the Bi atom in a hexadentate manner (N2O4); the fifth O atom functions as a bridging ligand. The bismuth coordination polyhedron can be regarded as a strongly distorted antiprism. In the octahedral cation, the Co(III) atom coordinates four N atoms of two DH ligands (average Co–N 1.897 Å) and two N atoms of two o-toluidine molecules (Co–N 2.023 Å). Thermolysis of the complexes studied was found to proceed in several successive steps, namely, the deaquation, deamination, and pyrolysis of the ligands.

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Authors and Affiliations

  1. State University of Moldova, ul. Matteevicha 60, Chisinau, 277009, Moldova

    V. Stavila & A. Gulya

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

    S. Shova & Yu. A. Simonov

  3. Mitskevich University, Poznań, Poland

    M. Gdanec

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  1. V. Stavila
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  2. A. Gulya
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  3. S. Shova
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  4. M. Gdanec
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  5. Yu. A. Simonov
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Stavila, V., Gulya, A., Shova, S. et al. Synthesis and Study of Heterometallic Co–Bi Compounds Based on Ethylenediaminetetraacetic Acid. Crystal and Molecular Structures of [Co(DH)2(o-NH2C6H4CH3)2]2[Bi2(μ-Edta)2(H2O)2] · 10H2O (DH2 is dimethylglyoxime). Russian Journal of Coordination Chemistry 28, 565–572 (2002). https://doi.org/10.1023/A:1019709713657

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