Enthalpies of solution of aliphatic compounds in dimethyl sulfoxide

Enthalpies of solution of aliphatic alcohols {CH3(CH2)nOH, n=0–10} and aliphatic nitriles {CH3(CH2)nCN, n=0–12} in dimethyl sulfoxide (DMSO) have been determined at 298.15 K for the mole fraction range 5×10−5 to 0.002. In all cases enthalpies of solution were found to be positive. Partial molar enthalpies of solution at infinite dilution were derived. Linear relations between the limiting excess partial molar enthalpies and the number of methylene groups were found for both groups of compounds investigated. McMillan–Mayer’s parameters, hxx and hxxx, showed unfavorable and favorable interactions, respectively.