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Studies on the Thermal Decompositions of Heteropolynuclear Glyoxylates of Cr(III) and Cu(II)

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Abstract

Complexes of Cr(III):Cu(II) with the glyoxylate dianion as ligand were synthesized in the range of cation atomic ratios (0.01–8):1.0.

The results of non-isothermal analysis of the synthesized compounds correlated with the results of IR and UV-VIS spectroscopy, and gas chromatography of the volatile products of the decomposition allowed the formulation of a mechanism for the decomposition of the complex with Cr(III):Cu(II)=2:1 and the assumption that the other complexes are mixtures of this with the homopolynuclear complexes of Cr(III) and Cu(II), depending on the ratio of the cations Cr(III):Cu(II).

The thermal conversion of the complexes takes place at relatively low temperatures, with partial transformation of the ligand into oxalate and of the oxide mixture into CuCrO4.

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Authors and Affiliations

  1. Faculty of Industrial Chemistry and Environmental Engineering, The Polytechnical University, RO-1900, Timişoara, Piata Victoriei nr. 2

    M. Ştefãnescu & M. Bîrzescu

  2. Romanian Academy - Timişoara Branch, Bd. M. Viteazul 24, RO-1900, Timişoara, Romania

    V. Sasca

Authors
  1. M. Ştefãnescu
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  2. V. Sasca
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  3. M. Bîrzescu
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Ştefãnescu, M., Sasca, V. & Bîrzescu, M. Studies on the Thermal Decompositions of Heteropolynuclear Glyoxylates of Cr(III) and Cu(II). Journal of Thermal Analysis and Calorimetry 56, 579–586 (1999). https://doi.org/10.1023/A:1010165030191

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  • DOI: https://doi.org/10.1023/A:1010165030191

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