Enthalpic Interaction Coefficients of N,N′-Hexamethylenebisacetamide in Aqueous Glucose and Sucrose Solutions at 298.15 K

Abstract

The enthalpies of dilution of N,N′-hexamethylenebisacetamide in aqueous glucose and sucrose solutions have been measured by using a mixing-flow microcalorimeter at 298.15 K. The enthalpic interaction coefficients (h2, h3, h4) in the range of the saccharide molality, (0 to 2.0) mol·kg−1, have been calculated according to the McMillan−Mayer model. The results show that the enthalpic pairwise interaction coefficients h2 of N,N′-hexamethylenebisacetamide in both the saccharide solutions are positive and become less positive with the increase of the saccharide molality. The value of h2 in aqueous glucose solutions is larger than that in aqueous sucrose solutions of the same molality. The effects of the two saccharides on h2 are discussed in terms of the solute−solute and solute−solvent interactions.