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Spectroscopic study of Mg(II) ion influence on the autoxidation of gallic acid in weakly alkaline aqueous solutions

  • Chemical Kinetics and Catalysis
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Abstract

Gallic acid autoxidation in weakly alkaline aqueous solutions was studied by UV-Vis spectrophotometry and ESR spectroscopy under various conditions. Lowering the pH value from 10 to 8.5 probably changes the mechanism of the autoxidation reaction as evidenced by the different time variations of UV-Vis spectra of solutions. The presence of Mg(II) ions greatly influences the autoxidation reaction at pH 8.5. Although the UV-Vis spectral changes with time follow the similar pattern during the gallic acid autoxidation at pH 10 and at pH 8.5 in the presence of Mg(II) ions, some small differences indicate that Mg(II) ions not only affect the electron density of absorbing species but also influence the overall mechanism of the autoxidation reaction. ESR spectra of free radials formed during the initial stage of gallic acid autoxidation at pH 8.5 in the presence of Mg(II) ions were recorded. Computer simulation of ESR spectra allows partial characterization of these free radicals.

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Authors and Affiliations

  1. Faculty of Medicine, Department of Chemistry, University of Niš, 18000, Niš, Serbia

    G. M. Nikolić & A. M. Veselinović

  2. Faculty of Sciences and Mathematics, Department of Chemistry, University of Niš, 18000, Niš, Serbia

    R. S. Nikolić & S. S. Mitić

Authors
  1. G. M. Nikolić
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  2. A. M. Veselinović
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  3. R. S. Nikolić
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  4. S. S. Mitić
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Correspondence to G. M. Nikolić.

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Nikolić, G.M., Veselinović, A.M., Nikolić, R.S. et al. Spectroscopic study of Mg(II) ion influence on the autoxidation of gallic acid in weakly alkaline aqueous solutions. Russ. J. Phys. Chem. 85, 2270–2273 (2011). https://doi.org/10.1134/S0036024411130176

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  • DOI: https://doi.org/10.1134/S0036024411130176

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