Collect. Czech. Chem. Commun. 2002, 67, 1141-1153

Conductance and Viscosity Studies of Ion Solvation in Mixed DMSO-MeOH Solvent

Mohinder S. Chauhan*, Kishore C. Sharma, Girish Kumar and Suvarcha Chauhan

Department of Chemistry, H.P. University, Shimla - 171005, India


Solvation behavior of Li+, Na+, K+, Ag+, Cl-, Br-, I- and ClO4- ions is reported at 25 °C from conductance and viscosity measurements of LiClO4, NaClO4, KClO4, AgClO4, LiCl, Bu4NClO4, Bu4NBr, Bu4NI, Ph4PBPh4, Bu4NBPh4, NaBPh4, Ph4PBr and NaBr in mixed DMSO-MeOH solvent. Anomalous behavior of Ag+ is interpreted as resulting from specific ion-solvent interactions. However, Li+, Na+ and K+ interact preferentially with DMSO electrostatically through oxygen atom of SO group. Initial decrease in solvation of alkali metal ions on addition of MeOH to pure DMSO is interpreted as an indication of strong intermolecular interactions between solvent components preferably through the hydrogen bond formation. The region of relatively strong intermolecular interactions is found between 10 and 40 mole % MeOH. The viscosity studies imply the existence of interactions between Br- or I- and DMSO. The studies however, indicate poor solvation of anions in this solvent system.

Keywords: Cations; Solvation; Dimethyl sulfoxide; Methanol; Ion-solvent interaction; Solvent mixtures; Viscosity; Conductance.

References: 30 live references.