Abstract
Excess enthalpies of eight binary mixtures between each of methyl methylthiomethyl sulfoxide (MMTSO) and dimethyl sulfoxide (DMSO) and one of cycloethers (oxepane, oxetane, 3, 4-dihydroxy-2H-pyrane and furan) have been determined at 298.15K. All those mixtures show positive excess enthalpies over the whole range of mole fractions except furan+MMTSO, furan+DMSO, and oxetane+MMTSO. Excess enthalpies of the cycloether+MMTSO or+DMSO decrease with increasing the number of oxygen atoms in the cycloether molecules, except oxolane+MMTSO and increased with increasing methylene radicals in the ring. Excess enthalpies of MMTSO+cycloethers are smaller than those of DMSO+cycloethers for the same cycloether except the 1, 3-dioxolane mixtures. The excess partial molar enthalpies at infinite dilution of mixtures of cycloethers+MMTSO and+DMSO were affected strongly by dipole-induced dipole interactions.
