Add time:08/21/2019         Source:sciencedirect.com

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 HE 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 HE 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.

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