Magneto-optical rotation studies of liquid mixtures. Part 5.—Binary mixtures of water with dimethylsulphoxide, formamide, methyl formamide, dimethyl formamide and acetonitrile

Abstract

Measurements have been made of the magneto-optical rotations at 435.8 nm of binary liquid mixtures of water with dimethylsulphoxide, formamide, methyl formamide, dimethyl formamide and acetonitrile as part of a study to investigate the applicability of the magneto-optical method in detecting weak molecular interactions in liquid mixtures. The departure from ideality of the mixtures was treated in terms of an excess magnetic rotation, α^E. For mixtures of water with dimethylsulphoxide, formamide, methyl formamide and dimethyl formamide the values of α^E indicated interaction between the components, whereas with acetonitrile the α^E values were compatible with a breakdown of the water structure in the mixtures.