On the hydrolysis of AgII, TlII, SnIII and CuIII

Abstract

Using pulse radiolysis with optical, conductometric and polarographic detection it is shown that the oxidation of Tl⁺, Ag⁺, Cu²⁺ and Sn²⁺ by hydroxyl radicals proceeds via on OH adduct: Meⁿ⁺+·OH → Me(OH)ⁿ⁺. Depending on pH, the OH adduct may react with a proton followed by water elimination, may add OH^– or react with water followed by elimination of a proton. The pK values for the equilibria Me⁽ⁿ⁺¹⁾⁺⇌ Me(OH)ⁿ⁺⇌ Me(OH)^(n–1)+⇌… decrease with increasing state of oxidation of Me. The oxidative properties decrease with increasing state of hydrolysis.