No abstract

No abstract

No abstract

Viscosity data were measured for n-hexyl ammonium perchlorate (C6H13NH3ClO4)(HAP) and n-octylammonium perchlorate (C8H17NH3ClO4) (OAP) in acetonitrile (AN), dimethylsulfoxide (DMSO) and their binary mixtures containing 0, 20, 40, 60, 80 and 100 mol%DMSO at 298, 308, 318 and 328 K in the concentration range 60-350×10-4 mol.dm-3. The data was further examined to evaluate ion-ion and ion-solvent interactions in terms of the Aand B coefficients of the Jones-Dole equation respectively. A and B coefficients for the studied electrolytes came out be to be positive throughout the whole composition range. However, smaller values of A as compare to B reveal the dominance of ion-solvent interaction over ion-ion interactions especially at 60 mol% DMSO in AN-DMSO mixtures. Thermodynamic parameters like free energy, enthalpy and entropy change of activation of the viscous flow have also been evaluated by using Erying transition state theory.

Molar conductance values of a large number of copper(I) perchlorate complexes behaving as strong 1:1 electrolytes, have been measured in binary mixtures of dimethylsulfoxide with dimethylacetamide and dimethylformamide at 298 K. The measured conductance data have been analyzed to obtain the limiting molar conductance (Λo) of these electrolytes. The limiting ion conductances (λ±°) for various ions in the binary mixtures of DMSO with DMA and DMF have been calculated by an indirect method using [Bu4N]BPh4 as a reference electrolyte. The actual ionic radii (ri) values for these copper(I) complex ions increase significantly with increase in DMA composition whereas the corresponding ri values for these ions do not show a significant increase with increase in DMF composition that indicates no preferential solvation of copper(I) complex ions for DMF over DMSO, thus showing that DMA solvates the copper(I) complex ions more strongly than DMF.