Solvation behaviour of some copper (I), silver (I) and tetraalkylammonium salts in actonitrile plus adiponitrile mixtures

Solvation behaviour of some copper (I), silver (I) and tetrabutylammonium salts has been investigated in binary mixtures of acetonitrile and adiponitrile containing 100, 90, 80, 70, 60 and 50 mol % AN at 298 K using molar conductance and viscosity measurements. The conductance data have been analyzed by using the Shedlovsky method to calculate limiting molar conductance (A) of the electrolytes. The solvated radii for various ions indicate that tetrabutylammonium (Bu4N+) and tetraphenylborate (BPh4-) are not solvated in all AN+ADN mixtures. The anions are poorly solvated but Cu+ and Ag+ are highly solvated in AN+ADN mixtures. The extent of solvation of Cu+ is greater then that of Ag+. The solvation of these both ions increases in ADN rich region of the mixtures. The viscosity data have been analyzed by using the Jones-Dole equation to calculate viscosity B-coefficients of electrolytes. The ionic B-+/- coefficients for individual ions have been evaluated. The results show that anions are weakly solvated in whole composition range of AN + ADN mixtures. The B+ coefficients for Cu+ and Ag+ increase with increase in ADN composition i.e. these are better solvated in ADN rich region of binary mixtures. The viscosity results are in good agreement with the results obtained from the conductance studies.