Abstract
Values of the solution enthalpy of are measured and values of solvation enthalpy are calculated for formamide and N,N-two-substituted methyl-and ethylamides of formic and acetic acids in the mixed solvent: water-glycerol. Enthalpy coefficients of pair interactions between amides and glycerol in aqueous solutions are calculated. The influence of mixture composition and also of a structure and properties of the dissolved compounds on enthalpy characteristics is considered. Within the frames of the offered additive scheme the contributions from the structural fragments of molecules of amides to enthalpy characteristics of solutions are established. It has allowed us to analyze quantitatively the role of nonspecific and specific solvation of amides in solution, to predict the enthalpy of evaporation, solution, solvation, the enthalpy coefficients of pair interactions of experimentally unstudied N-methylformamide, N-ethylformamide, N-methyl-N-ethylformamide, N-methylacetamide, N-ethylacetamide, and N-methyl-N-ethylacetamide in the mixtures of water-glycerol, and also to evaluate the donor numbers of these specified amides.
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Original Russian Text Copyright © 2005 by D. V. Batov and D. D. Batov
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Translated from Zhurnal Strukturnoi Khimii, Vol. 46, No. 2, pp. 293–302, March–April, 2005.
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Batov, D.V., Batov, D.D. Solvation of amides of formic and acetic acids in water-glycerol mixture. Additivity of thermochemical characteristics of solutions. J Struct Chem 46, 285–294 (2005). https://doi.org/10.1007/s10947-006-0042-0
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DOI: https://doi.org/10.1007/s10947-006-0042-0