Excess molar enthalpies of binary mixtures containing N, N-dimethylformamide + six 2-alkanols (C3-C8) at 300.15 K

Excess molar enthalpies, , of N,N-dimethylformamide + 2-propanol, + 2-butanol, + 2-pentanol, + 2-hexanol, + 2-heptanol, and + 2-octanol have been determined at 300.15 K and atmospheric pressure using an isothermal microcalorimeter. values are positive over the entire range of composition of N,N-dimethylformamide and increase in the order 2-propanol < 2- butanol < 2-pentanol < 2-hexanol < 2-heptanol < 2-octanol. Maximum values of vary from 500 J·mol-1 up to 900 J·mol-1. The results are explained in terms of the strong self-association exhibited by the 2-alkanols and the cross-association of the O···HO specific interaction. The Redlich−Kister equation, fitted to the experimental results, provides a satisfactory mathematical representation of in all mixtures.