Conductance measurements of some electrolytes in N,N-dimethyformamide and its binary mixtures witth other organic solvents—II

Abstract Equivalent conductances of Bu 4 NBPh 4 , Bu 4 NNO 3 , Bu 4 NI,KClO 4 , Kl, NaI, NaBPh 4 , Ph 4 PCl, LiCl, AgNO 3 and CuClO 4 . 4AN have been measured at 25°C in binary mixtures of N,N -dimethylformamide (DMF) containing 1 mol % of 1, 1, 3, 3-tetramethylurea (TMU), dimethylsulphoxide (DMSO) and hexamethylphosphotriamide (HMPT). Such measurements for LiCl, NaI, KClO 4 and CuClO 4 . 4AN have also been carried out in DMF and in binary mixtures of DMF containing 1 mol % pyridine (Py), α-picoline (α-Pic), β-picoline (β-Pic), γ-picoline (γ-Pic) and acetonitrile (AN). The conductance data in all the cases have been analyzed by the Shedlovsky equation. Limiting ion conductances have been obtained by the method of Fuoss et al . The actual solvated radii of ions, evaluated using limiting ion conductances show that Ag + and Cu + have strong preferential solvation by all solvents which have been used to prepare the binary mixtures with DMF and the preferential solvation for both Ag + and Cu + with HMPT, DMSO and TMU is relatively stronger than with AN and is practically of similar magnitude as with the organic bases.