Excess enthalpies of o- and m-dihalogenated benzene+methyl methyl thiomethyl sulfoxide, +dimethyl sulfoxide at 298.15 K

Abstract

Excess enthalpies of binary mixtures between each of ortho- and meta-isomers of dihalogenated benzenes (difluorobenzene, dichlorobenzene, dibromobenzene) and methyl methylthiomethyl sulfoxide (MMTSO) or dimethyl sulfoxide (DMSO) have been determined at 298.15 K. All mixtures showed positive enthalpy changes over the whole range of mole fractions except m-difluorobenzene+DMSO. Excess enthalpies of m-difluorobenzene+DMSO have small two maxima and one negative minimum. Excess enthalpies of the mixtures containing dichlorobenzene showed the largest enthalpy among the halogenated benzene+MMTSO. Linear relations are obtained between limiting excess partial molar enthalpies and the products of square of dipole moment divided by limiting partial molar volume of the components, except the mixture of o-difluorobenzene+DMSO.