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Gold(I) cysteinate complexes in aqueous solutions

  • Physical Chemistry of Solutions
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Abstract

Equilibria between gold(I) cysteinate complexes in aqueous solutions are studied by pH-metry, solubility measurements, and potentiometric measurements using a gold electrode at 25°C and I = 0.2 M (NaCl). The stepwise protonation constants logK iH of cysteinate H i – 1Cysi – 3 + H+ = H i Cysi – 2 are as follows: 10.10 (i = 1), 8.12 (i = 2), and 1.90 (i = 3). Protonation of cysteinate complexes is studied: Au(Cys) 3−2 + H+ = Au(HCys)(Cys)2–, logK 1H Au = 9.62 and Au(HCys)(Cys)2– + H+ = Au(HCys)2 −, logK 2HAu = 9.01. The constant K S of the heterogeneous equilibrium Au(HCys)s + HCys– = Au(HCys) −2 is 3.3. The standard potential of the Au(Cys) 3−2 complex is E 01/0 = –0.172 ± 0.011 V. The stability of the Au(HCys) −2 complex is close to that of Au(HS) −2 . The constant of substitution Au(HCys) −2 + SO 2−3 = Au(HCys)SO 2−3 + HCys– is determined to be logK 11H = –1.3.

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Authors and Affiliations

  1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia

    I. V. Mironov & V. Yu. Kharlamova

  2. Novosibirsk National Research State University, Novosibirsk, 630090, Russia

    I. V. Mironov & V. Yu. Kharlamova

Authors
  1. I. V. Mironov
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  2. V. Yu. Kharlamova
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Correspondence to I. V. Mironov.

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Original Russian Text © I.V. Mironov, V.Yu. Kharlamova, 2017, published in Zhurnal Neorganicheskoi Khimii, 2017, Vol. 62, No. 7, pp. 1008–1015.

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Mironov, I.V., Kharlamova, V.Y. Gold(I) cysteinate complexes in aqueous solutions. Russ. J. Inorg. Chem. 62, 1014–1020 (2017). https://doi.org/10.1134/S0036023617070154

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  • DOI: https://doi.org/10.1134/S0036023617070154

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