Abstract

Within the framework of the theory of McMillan and Mayer, coefficients have been calculated for pair and ternary interactions in mixtures of water and formamide, water and N-methylformamide, water and N,N-dimethylformamide, and water and hexamethylphosphoric triamide; also their temperature coefficients in the 283–323 K range have been calculated. The magnitude of the coefficient of pair interaction reflects the hydrophobic (or hydrophilic) character of the interaction of the amide with water. Analysis of different criteria of hydrophobicity and the characteristics of intermolecular interaction cannot provide any unambiguous conclusions regarding the influence of temperature on the hydrophobic or hydrophilic properties of these systems.

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