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Synthesis, structural characterization and thermal analysis of the cobalt(II) oxalate obtained through the reaction of 1,2-ethanediol with Co(NO3)2 · 6H2O

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Abstract

The homopolynuclear coordination compound [CoL · 2.5H2O]n with L=C2O4 2− was synthesized by a new unconventional method. It consist in the redox reaction between 1,2-ethanediol and cobalt nitrate in presence of nitric acid. The coordination compound was characterized by chemical analysis, electronic and vibrational spectra respectively, thermal analysis. In the coordination compound the Co(II) ion exists in a high spin octahedral configuration and oxalate anion acts as double-bridge ligand, tetradentate, similar as in CoC2O4 · 2H2O obtained by the classical method. Nonstoichiometric oxide, Co3O4+0.25 with deficit in cobalt and normal spinel Co3O4 where identified as thermal decomposition intermediates. As final product of decomposition, the oxide CoO was obtained.

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Authors and Affiliations

  1. Faculty for Industrial Chemistry and Environmental Engineering, University ‘Politehnica’ of Timisoara, Piata Victoriei No. 2, 300006, Timisoara, Romania

    M. Bîrzescu, M. Niculescu & Raluca Dumitru

  2. Institute of Physical Chemistry, ‘I. G. Murgulescu’, Spl. Independentei No. 202, Sector 6, Bucharest, Romania

    Oana Carp

  3. Faculty of Chemistry, Department of Physical Chemistry, University of Bucharest, 70606 Bd. Elisabeta 4-12, Bucharest, Romania

    E. Segal

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  1. M. Bîrzescu
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  2. M. Niculescu
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  3. Raluca Dumitru
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  4. Oana Carp
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  5. E. Segal
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Correspondence to Raluca Dumitru.

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Bîrzescu, M., Niculescu, M., Dumitru, R. et al. Synthesis, structural characterization and thermal analysis of the cobalt(II) oxalate obtained through the reaction of 1,2-ethanediol with Co(NO3)2 · 6H2O. J Therm Anal Calorim 96, 979–986 (2009). https://doi.org/10.1007/s10973-009-0054-z

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