Abstract
Excess enthalpies of (methyl methylthiomethyl sulfoxide (MMTSO)+methanol, +ethanol, +1-propanol) and (dimethyl sulfoxide (DMSO)+methanol, +ethanol, +1-propanol) have been determined at 298.15K. All the systems, except methanol+DMSO, show the positive enthalpies over the whole range of mole fraction. Excess enthalpies of MMTSO+alcohols are larger than those of DMSO+alcohols and increased with increasing the number of methylene groups of alcohols. Linear relationships are obtained between the excess partial molar enthalpies of MMTSO and DMSO at infinite dilution and relative dielectric constants of alcohols. These linearities also hold for the cases of aqueous mixtures of MMTSO and DMSO.
