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Molar conductance and viscosity of some tetraalkylammonium perchlorates (R 4 NClO 4  where R = Methyl, Ethyl, Propyl, Butyl) have been measured in the concentration range (30–500) × 10 −4  mol kg −1  at 298.15 K in the binary mixtures of dimethylsulfoxide (DMSO) + methanol (MeOH) containing 0, 20, 40, 50, 60, 80 and 100 mol% methanol. Conductance data has been analyzed using the Shedlovsky equation and the viscosity data by Jones-Dole equation. The limiting ionic conductances (λ  ±  o    $\lambda_{\pm}^{o}$   ) were used to calculate the solvated radii ( r i  ) of the ions. The  A  and  B  coefficients of the Jones-Dole equation are positive in all salts. The  A  coefficients are in reasonable good agreement with the limiting theoretical values ( A η  ) calculated using Falkenhagen-Vernon equation. The variation of the ionic  B ±   coefficients as well as the actual solvated radii ( r i  ) with solvent composition in DMSO + MeOH mixtures show the preferential solvation of tetraalkylammonium ions by MeOH and MeOH-rich region of the mixtures. The tetraalkylammonium ions exhibit solvation in the order Me 4 N +  &gt; Et 4 N +  &gt; Pr 4 N +  &gt; Bu 4 N + .

zeitschrift für physikalische chemie

Viscometric and Conductometric Studies of Solvation Behaviour of Tetraalkylammonium Salts in the Binary Mixtures of Dimethylsulfoxide and Methanol at 298.15 K