Component interactions in aqueous dimethyl sulphoxide

Abstract

This spectroscopic and thermodynamic study of aqueous dimethyl sulphoxide (DMSO) suggests that the properties of the system are dominated by direct component interaction. Maximum interaction occurs in the region of 0.35 mole fraction (DMSO) and '' enhancement of water structure " by added solute is absent, except perhaps at very low concentration, cO.01 mole fraction. The excess enthalpy HE, is compared with literature values.

Intermolecular Interactions in Aqueous Dimethyl Sulphoxide and Acetic Acid Probed by High‐Pressure FTIR

“…1,[3][4][5] The in ter ac tion of wa ter with the hy dro pho bic parts of mol e cules is also dis cussed in the lit er a ture, 2,[5][6][7][8] but in most cases in ter pre ta tion has been com pli cated by the in her ent weak ness of hy dro pho bic hydration. Wa ter and dimethyl sulfoxide (DMSO) in ter act with each other and with other sol utes through hy dro gen bonding, [3][4][5][6][7][8][9][10][11] but de tails of such in ter ac tions are not well char ac terized. Vi bra tional spec tra of aque ous DMSO, spe cif i cally of the S=O stretch ing vi bra tion, 3,7,[12][13][14] has been stud ied at wide con cen tra tion in ter vals, while DMSO has been de scribed as en hanc ing wa ter struc ture.…”

“…1,[3][4][5] The in ter ac tion of wa ter with the hy dro pho bic parts of mol e cules is also dis cussed in the lit er a ture, 2,5-8 but in most cases in ter pre ta tion has been com pli cated by the in her ent weak ness of hy dro pho bic hydration. Wa ter and dimethyl sulfoxide (DMSO) in ter act with each other and with other sol utes through hy dro gen bonding, 3-11 but de tails of such in ter ac tions are not well char ac terized.…”

“…Wa ter and dimethyl sulfoxide (DMSO) in ter act with each other and with other sol utes through hy dro gen bonding, [3][4][5][6][7][8][9][10][11] but de tails of such in ter ac tions are not well char ac terized. Vi bra tional spec tra of aque ous DMSO, spe cif i cally of the S=O stretch ing vi bra tion, 3,7,[12][13][14] has been stud ied at wide con cen tra tion in ter vals, while DMSO has been de scribed as en hanc ing wa ter struc ture. 1,5 The en hanced hy dro gen bonding be tween wa ter mol e cules in aque ous DMSO com pared to bulk wa ter was at trib uted by Soper et al 5 to the pres ence of a strong hy dro gen-bonding site on the DMSO ox y gen and not to any spe cial or der ing around the methyl head groups.…”

“…1,5 The en hanced hy dro gen bonding be tween wa ter mol e cules in aque ous DMSO com pared to bulk wa ter was at trib uted by Soper et al 5 to the pres ence of a strong hy dro gen-bonding site on the DMSO ox y gen and not to any spe cial or der ing around the methyl head groups. 5 Never the less, some stud ies in di cated that the hydration of the C-H groups may also arise in low con cen trated DMSO so lution, 3,7,8 while the pres ence of anom a lous po lar ized wa ter mol e cules, i.e., hy dro pho bic hydration, was in di cated in the con cen tra tion re gion of X wa ter > 0.8. 7 The con tro versy is mainly caused by the dif fi culty to ob tain the ev i dence of hydro pho bic in ter ac tions, since the C-H---O in ter ac tion is typ ically weak or less than 1 kcal/mol.…”

Viscosity Coefficients of KCl, NaCl, NaI, KNO3, LiNO3, NaBPh4 and Bu4NI in Water - Dimethyl Sulfoxide Binary Mixtures With a Low Organic Solvent Content

“…[44,45] In the area of high concentration of DMSO, intermolecular associates of different types are created. On the basis of the enthalpy of mixing [46] and density [47] measurements, the existence of DMSO · 2H2O associates was suggested. It seems, however, that the correlation of changes in the structure of a mixed solvent with changes in the value of the coefficient B Jones-Dole equation is an extremely difficult task which demands more systematic studies.…”