On Gold(I) Thiomalate Complexes in Aqueous Solution


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Abstract

Certain equilibria involving polymeric gold(I) thiomalate complexes have been studied by spectrophotometry and pH measurements in aqueous solution at 25°С and I = 0.2 M (NaCl). Thiomalate protonation constants Hi–1Tm3– + H+ = HiTmi–3 have been found to be logKH1 = 10.23, logKH2 = 4.51, logKH3 = 3.01. Efficient functions have been used to allow for multiple protonation of polymeric complexes Aun Tmmn-3
m
Equilibrium constants for reactions Au4Tm48− + Tm3– = Au4Tm511− (logK45 = 10.1 ± 0.5) and 0.25 Au4Tm48− + Tm3– = AuTm25− (logK12 = 4.9 ± 0.2) have been determined. Standard potential for AuTm25− has been found to be equal to E1/00 =–0.260 ± 0.025 V.

About the authors

I. V. Mironov

Nikolaev Institute of Inorganic Chemistry, Siberian Branch; Novosibirsk State University

Author for correspondence.
Email: imir@niic.nsc.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090

V. Yu. Kharlamova

Nikolaev Institute of Inorganic Chemistry, Siberian Branch; Novosibirsk State University

Email: imir@niic.nsc.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090

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