Proton nuclear magnetic resonance studies of the variation of ‘neighbour anisotropy’ screening with composition of mixtures, and some comments on its relationship to the thermodynamics of solutions

Abstract

The screening attributed to neighbour anisotropy effects for a series of liquid mixtures was experimentally determined as a function of constituent concentration. It is shown that anisotropy screenings of mixtures are not normally linearly additive mole- or volume-fraction functions of the anisotropy screenings of the pure constituents. It is proposed that the variation of anisotropy is a function of the ‘degree of perfection’ of the mixture, and the thermodynamics of perfect and imperfect mixtures are considered in relation to the variations observed.