Thermochemical Study of Mixtures of Formamide with Tertiary Amides of Carboxylic Acids

摘要

Ethalpies of Mixing of formamide with tertiary amides at 298.15 K were determined experimentally. The thermodynamic characteristics of these solutions at infinite dilution of the components i neach other were calculated. The strong exothermic effect of interaction of amides with formamide is due to formation of heterocomponent hydrogen bonds which are stronger than those in formamide. An increase in the length of alkyl groups and in the electron-donor power of tertiary formamides and acetamids has a weak effect of H~E, in contrast to their mixtures with water which is largely due to structural features of formamide and water. The shape of concentration dependences of H~E,their absolute values, and other thermodynamic characteristics of mixtures of tertiary amides with formamide and water also strongly depend on the molecular size of the self-associated components