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Molar conductances and viscosities of some tetraalkylammonium perchlorate salts (R 4 NClO 4  where R=methyl, ethyl, propyl, butyl) have been measured in the concentration range (30–500)×10 −4  M in the binary mixtures of acetonitrile (AN)+methanol (MeOH) containing 0, 20, 40, 60, 80 and 100 mol% methanol at 298.15 K. Conductance data was analyzed by the Shedlovsky equation and the viscosity data by Jones–Dole equation. The limiting ionic conductances ( λ  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 reasonably good agreement with the limiting theoretical values ( Aη ) calculated using Falkenhagen–Vernon equation. The variation of the actual solvated radii ( r   i  ) as well as the ionic  B  ±  coefficients with solvent composition in AN+MeOH mixtures shows the preferential solvation of tetraalkylammonium ions by methanol-rich region of the mixtures. The extent of solvation of the tetraalkylammonium ions is in the order Me 4 N + &gt;Et 4 N + &gt;Pr 4 N + &gt;Bu 4 N + .

zeitschrift für physikalische chemie

Solvation of Some Tetraalkylammonium Salts Investigated Conductometrically and Viscometrically in Binary Mixtures of Acetonitrile + Methanol at 298.15 K