Abstract
Abstract Sodium-23 chemical shifts have been determined in dimethylsulfoxide-acetonitrile, dimethylsulfoxide-nitromethane, pyridine-nitromethane, pyridine-acetonitrile, benzonitrile-nitromethane and pyridine-dimethylsulfoxide binary mixtures. In each case a smooth transition is observed from one pure solvent to the other but the plots show considerable curvature indicating preferential solvation by one of the solvents. The relative solvating abilities of the solvents in binary mixtures were found to be: DMSO > CH3NO2, DMSO > CH3CN, DMSO > Py, Py > CH3CN, PhCN > CH3NO2. Preferential solvation of the sodium ion by DMSO in DMSO-Py mixtures is also confirmed by the far infrared study of the Na+ ion-solvent cage vibration in the binary mixture.
Published Version
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