Thermodynamics of liquid mixtures containing methyl methylthiomethyl sulfoxide

Excess enthalpies of cycloether + methyl methylthiomethyl sulfoxide or dimethyl sulfoxide at 298.15 K

“…The limiting excess partial molar enthalpies of the cycloethers, H~ '~, of all the mixtures with MMTSO studied are longer than those of MMTSO, H~ '~, except for oxolane + MMTSO. Similar result had been obtained for the mixtures of methylbenzenes and MMTSO [7], although the mixtures of MMTSO with water [3], chloromethanes [4], and n-alkane-1-ols [6] were different. (2) oxane (1)+MMTSO (2) oxolane (1) The limiting excess partial molar enthalpies of MMTSO in cycloether were increased by 1.0 ~.mo1-1 per methylene radical except for the mixture containing oxolane.…”

“…As we reported previously [2][3][4][5][6][7], the mixtures containing MMTSO are energetically less stable or more unstable than those containing DMSO, when the other component is polar, irrespective of being aprotic or protic, namely water [3], chloroform, deuterochloroform [5], dichloromethane [4], n-alkane-l-ols [6], and methyl alkylketones [12]. On the other hand, the mixtures containing DMSO, are more unstable than those with MMTSO, when the second component is nonpolar as C6H6-n(CH3)~, n = 0 to 3 [3,7]. Although cycloethers have polar radicals, the mixture of cyclic ether + MMTSO and cyclic ether + DMSO showed a behaviour similar to the mixtures with nonpolar component.…”

“…(2) oxane (1)+MMTSO (2) oxolane (1) The limiting excess partial molar enthalpies of MMTSO in cycloether were increased by 1.0 ~.mo1-1 per methylene radical except for the mixture containing oxolane. Those of MMTSO in methylbenzenes were increased by 0.67 kJ-moF 1 per methyl radical [7]. The effect of methylene radicals in alicyclic molecules on the excess enthalpies were larger than that of methyl radicals in aromatic molecules.…”

“…In our previous papers [2][3][4][5][6][7], excess thermodynamic functions for the binary mixtures of methyl methylthiomethyl sulfoxide (MMTSO) with water, benzene, dimethyl sulfoxide (DMSO), carbon tetrachloride, chloroform, dichloromethane, deuterochloroform, n-alkane-l-ols (n=l to 9) and six methylbenzenes (C6H6-n(CH3)n, n = 1 to 3) and those of DMSO were reported.…”