Weak complexes of sulphur and selenium. Part 6. Stability constants of the weak 1 : 1 complexes of sulphur dioxide, thionyl chloride, and sulphonyl chloride with halide ions in the mixed solvent acetonitrile-dimethyl sulphoxide at 25 °C

Abstract

The stability constants of SO₂·X^–, SOCl₂·X^–, and SO₂Cl₂·X^–(X^–= Cl^–, Br^–, or I^–) have been determined spectro-scopically in different mixtures of acetonitrile and dimethyl sulphoxide as solvent. The values (at 25 °C) are not constant for different solvent mixtures. To account for this it is assumed that a number of interactions exist in these solutions, and of these solvent-solvent interactions are believed to play an important role.