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Cobalt(II) and Nickel(II) Compounds with 2-Thiobarbituric Acid

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Abstract

Interaction between the systems containing cobalt(II) or nickel(II) chlorides and 2-thiobarbituric acid (C4H4N2O2S, H2L) was examined by spectrophotometry and pH-metry at pH < 4, I = 0.1 (NaCl) and T = 20°C. The compositions and the overall stability constants (log β11) of protonated complex species were determined: [CoHL]+ (3.69 ± 0.04), [NiHL]+ (3.68 ± 0.08), and [M(HL)2]. The compositions of the Co(C4H3N2O2S)2 · 4H2O and Ni(C4H3N2O2S)2 · 5H2O salts isolated from the studied systems were confirmed by different physicochemical methods; their solubility constants (log KS) were calculated to be –12.82 ± 0.22 and –12.30 ± 0.10, respectively. A spectrophotometric technique was developed for determining thiobarbiturate ion in aqueous solutions. This technique is based on the absorbance of iron(III) thiobarbiturate complex [FeL]+ and can be recommended for analytical chemists and pharmacists.

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Authors and Affiliations

  1. National Research Tomsk State University, 634050, Tomsk, Russia

    A. P. Lakeev & N. M. Korotchenko

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  1. A. P. Lakeev
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  2. N. M. Korotchenko
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Correspondence to A. P. Lakeev.

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Translated by D. Terpilovskaya

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Lakeev, A.P., Korotchenko, N.M. Cobalt(II) and Nickel(II) Compounds with 2-Thiobarbituric Acid. Russ. J. Inorg. Chem. 65, 1232–1239 (2020). https://doi.org/10.1134/S0036023620080082

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