Solvation of copper (I) perchlorate in benzonitrile plus pyridine mixturesinvestigated by conductance studies

Molar conductances of Bu4NBPh4, Bu4NClO4 and CuClO4 have been measured in t he concentration range (1-175) x 10(-4) mol dm(-3) at 298.15, 308.15 and 31 8.15 K in benzonitrile + pyridine mixtures containing 0, 20, 40, 60, 80 and 100 mol% benzonitrile. The conductance data have been analyzed by the Shed lovsky equation to obtain Lambda(0) values of the electrolytes. Limiting io n conductances (lambda(i)(0)) and solvated radii (r(i)) for Cu+ and CiO(4)( -) have been evaluated. The results show that Cu+ is strongly solvated both in benzonitrile and pyridine but the solvation decreases in the binary mix tures due to a strong competition between benzonitrile and pyridine molecul es. ClO4- has a poor solvation in benzonitrile, pyridine as well as in benz onitrile + pyridine mixtures.