Reactions in mixed non-aqueous systems containing sulphur dioxide. Part 2. The dissolution of transition metals in the binary mixture dimethyl sulphoxide–sulphur dioxide, and ion-pair formation involving the sulphoxylate radical ion in mixed solvents containing sulphur dioxide

Abstract

The metals (Ti, V, Mn, Fe, Co, Ni, Cu, Zn, and Cd) react with the mixed non-aqueous solvent dimethyl sulphoxide–sulphur dioxide to form the metal disulphates. Other metals (M = Ce, Pr, Eu, Dy, or U) dissolve in the mixed solvent, but it has not been possible to characterize the products. The existence of the [SO₂]^– radical ion, and of ion pairs containing a metal ion and [SO₂]^–, has been demonstrated for solutions of metals in non-aqueous solvents containing sulphur dioxide. A correlation has been established between dielectric constant, donor number, and the reactivity of metals in solvents containing sulphur dioxide.