Reactions in mixed non-aqueous solutions containing sulphur dioxide. Part 8. Phase studies of sulphur dioxide–dimethyl sulphoxide and sulphur dioxide–dimethylformamide mixtures

Abstract

Phase diagrams are given for the complete range of compositions of sulphur dioxide–dimethyl sulphoxide (dmso) and sulphur dioxide–dimethylformamide (dmf). SO₂–dmso mixtures contain compounds of compositions 2SO₂·dmso and SO₂·dmso, identifiable as solids with melting points –74 and –39 °C, but no compound of composition SO₂·2dmso was found which was stable as a solid. SO₂–dmf mixtures contain three stable solid species: 2SO₂·dmf, SO₂·dmf, and SO₂·2dmf, with melting points –65, –60, and –40 °C.