Aqueous solutions of unipositive cadmium; reactions of (CdI)22+(aq)Electron Transfer, part 146. For part 145, see ref. 1.

Abstract

Aqueous solutions 10⁻³ mol dm⁻³ in (Cd^I)₂, prepared by treating O₂-free solutions of Cd(ClO₄)₂ or Cd(O₃SCF₃)₂ with Cd powder at 65 °C, can be handled by conventional methods; the comproportionation constant (Cd²⁺ + Cd ⇌ Cd₂²⁺) is estimated as 0.018 (24 °C, I = 1.14 M) and the formal oxidation potential as −0.45 V; this atypical state readily reduces I₃⁻, IrCl₆²⁻, pyridine complexes of (NH₃)₅Ru^III, and superoxo derivatives of (NH₃)₅Co^III.