Additional Aspects of Complexation of Gold(I) with Thiomalate

Igor V. Mironov, Viktoria Yu Kharlamova

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2 Citations (Scopus)


Some equilibria involving gold(I) thiomalate (mercaptosuccinate, TM) complexes have been studied in the aqueous solution at 25 °C and I = 0.2 mol·L−1 (NaCl). In the acidic region, the oxidation of TM by (Formula presented.) proceeds with the formation of sulfinic acid, and gold(III) is reduced to gold(I). The interaction of gold(I) with TM at nTM/nAu ≤ 1 leads to the formation of highly stable cyclic polymeric complexes (Formula presented.) with various degrees of protonation depending on pH. In general, the results agree with the tetrameric form of this complex proposed in the literature. At nTM/nAu > 1, the processes of opening the cyclic structure, depolymerization and the formation of (Formula presented.) occur: (Formula presented.), log10K45 = 10.1 ± 0.5; 0.25 (Formula presented.), log10K12 = 4.9 ± 0.2. The standard potential of (Formula presented.) is (Formula presented.). The numerous protonation processes of complexes at pH < 7 were described with the use of effective functions.

Original languageEnglish
Pages (from-to)511-527
Number of pages17
JournalJournal of Solution Chemistry
Issue number3
Publication statusPublished - Mar 2018


  • Complexes of gold(I)
  • Polymeric complexes
  • Protonated complexes
  • Thiomalate

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