Thermodynamic properties of organic oxygen compounds excess enthalpies for some ester + hexane or + 1-bromohexane, and bromoester + hexane mixtures

Abstract

Excess enthalpies of hexane + methyl acetate, +ethyl acetate, +isopropyl acetate, + tert-butyl acetate, +methyl propionate, +ethyl propionate, + tert-butyl propionate, +methyl butyrate, +ethyl-3-bromopropionate, +ethyl-2-bromobutyrate, or +ethyl-4-bromobutyrate, and 1-bromohexane +ethyl acetate, +ethyl propionate, or +methyl butyrate, have been measured at 303.15 K as a function of composition. The results obtained show an increase of H E when the length of either the alcoholic or the acid radical of the ester decreases. In the investigated (aliphatic ester + 1-bromohexane) mixtures the contribution of the specific BrO(carboxylate) interaction to H E seems to be of roughly the same size as the BrO(carbonyl group) one, and in the (bromoester + hexane) mixtures the intramolecular BrO interaction increases as the separation between the bromine atom and the carboxylate group decreases.