Enthalpies of Interaction of (2R,3S,4S,5S)-Hexane-1,2,3,4,5,6-hexol with Acetamide and N,N-Dimethylformamide in Aqueous Sodium Chloride Solutions at 298.15 K

Abstract

The enthalpies of mixing of (2R,3S,4S,5S)-hexane-1,2,3,4,5,6-hexol with acetamide and N,N-dimethylamide in aqueous sodium chloride solutions have been determined by using flow-mix-isothermal microcalorimetry at 298.15 K. These experimental results have been used to determine the heterotactic enthalpic interaction coefficients (hxy, hxxy, and hxyy) according to the McMillan−Mayer theory. It has been found that the heterotactic enthalpic pairwise interaction coefficients (hxy) for (2R,3S,4S,5S)-hexane-1,2,3,4,5,6-hexol−acetamide and (2R,3S,4S,5S)-hexane-1,2,3,4,5,6-hexol−N,N-dimethylamide systems in aqueous sodium chloride solutions are both positive and become more positive with an increase in the molality of sodium chloride. The results are discussed in terms of solute−solute interaction and solute−solvent interaction.