Isoionic association of cobalt [III] complexes of pyridinealdehyde-thiosemicarbazone halides in water, methanol and ethanol

The ion-pair association of cobalt [III] complexes of pyridinealdehydethiosemicarbazone halides in water, methanol, and ethanol at 25 degree from conductance measurements was found to depend on the solvation of the anion and decreased with increasing anion crystallographic radius. The association constant KA increased with increasing anionic in water while the contrary was observed in the case of methanol and ethanol. The association constant KA is analyzed on the basis of solvent separated -ion pair model