Partial molal volume behavior of tetraalkylammonium chlorides in aqueous acetone and aqueous dimethylsulfoxide

Abstract

The partial molal volumes of a series of tetraalkylammonium chlorides in aqueous acetone and aqueous dimethylsulfoxide at 25.000 "C are reported as a function of solvent composition. It is shown that for each solvent composition the partial niolal volume data are better represented by a quadratic in solute molecular weight than by the linear expression previously employed in similar studies. Extrapolation of molecular partial molal volumes to zero cation molecular weight has permitted evaluation of the partial molal volumes of the ions R4N+ and C1-. The variation of molecular and ionic partial molal volume as a function of solveht composition is discussed.

Apparent molar volumes and isentropic compressions of benzylalkylammonium ionic liquids in dimethylsulfoxide from 293.15 K to 328.15 K

“…On the other hand, the slope, S v shows that the ionion interactions. In generally, S v is positive, but it can be negative for some electrolytes; particularly for tetraalkylammonium salts [52][53][54], and also have been observed in this work, values of V m 1 , S v and B v for the ILs + DMSO systems were obtained at various temperatures by a linear regression analysis, and the results are listed in Table 4 along with their the standard deviations. It was found that the apparent molar volumes at infinite dilution, V m 1 for the ILs increase with the increase in the methyl group in the cation/ anion part of ILs at a particular temperature.…”

Density and Viscosity of LiCl, LiBr, LiI and Kcl in Aqueous Methanol at 313.15K

“…Various researchers have seen a shift in f 0 v with different concentrations of other solvents in water in the case of electrolytes. [23][24][25] The S v values of LiCl are negative in water and methanol mixtures at 50% methanol indicating some ion-ion interactions shown in Table 4. Similarly, the S v values of LiBr are negative in water and methanol mixtures at 40% and 50% methanol and LiI shows it negative at 40, 50, 60% methanol indicating ion-ion interactions.…”

Standard partial molar volumes and viscosity B-coefficients of ionic liquids [Cnmim]Br (n=4, 6, 8) in alcohols at 298.15K

“…S v indicates the ion-ion interactions. In the concentration range studied, S v is generally positive but may be negative for some electrolytes, particularly for tetraalkylammonium salts [28][29][30]. B v describes deviation from Debye-Hückel limiting law (DHLL), which can be understood in terms of interactions among ion solvation shells.…”