A Study Of Activation Parameters For Viscous Flow Process Of Tetrabutyl Ammonium Iodide In Binary Mixture Of N,NDimethylformamide And Ethylmethylketone At Different Temperatures

Viscosities and densities of tetrabutylammonium iodide (Bu4NI) in N,NDimethylformamide (DMF), ethylmethyl ketone (EMK) and DMF + EMK solvent mixtures containing 0, 20, 40, 60, 80 and 100 mol % of DMF at 298, 308 and 318K have been reported. The viscosity data have been analysed in terms A- and B- viscosity coefficients of the Jones Dole equation. Both A- and B coefficients have found to be positive over the entire solvent composition range at all temperatures. Partial molal volumes ( ) have also been calculated which have been used along with B- values to calculate the activation parameters for viscous flow process electrolytic solution. The activation parameters have been examined as a function of solvent composition to interpret the solution behaviour of tetraethyl ammonium bromide (Bu4NI) in binary mixture of DMF-EMK. The behaviuor of these suggests strong ion-solvent interactions in these systems and that Bu4NI act as structure-maker in EMK+DMF mixed solvents.