Additional Aspects of Complexation of Gold(I) with Thiomalate

作者：Mironov Igor V^*; Kharlamova Viktoria Yu

来源：Journal of Solution Chemistry, 2018, 47(3): 511-527.

DOI：10.1007/s10953-018-0735-y

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

Some equilibria involving gold(I) thiomalate (mercaptosuccinate, TM) complexes have been studied in the aqueous solution at 25 A degrees C and I = 0.2 mol center dot L-1 (NaCl). In the acidic region, the oxidation of TM by proceeds with the formation of sulfinic acid, and gold(III) is reduced to gold(I). The interaction of gold(I) with TM at n (TM)/n (Au) ae 1 leads to the formation of highly stable cyclic polymeric complexes 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 n (TM)/n (Au) > 1, the processes of opening the cyclic structure, depolymerization and the formation of occur: , log(10) K (45) = 10.1 +/- 0.5; 0.25 , log(10) K (12) = 4.9 +/- 0.2. The standard potential of is . The numerous protonation processes of complexes at pH < 7 were described with the use of effective functions.

• 出版日期2018-3