Abstract
The stability constants of ternary complexes of Cu(II) with sulfanilamide drug (S) as primary ligand and some of bioligands viz., amino acids and peptides as secondary ligand were determined pH-metrically at 25 degrees C and ionic strength 0.1 mol/L NaNO3 in aqueous solution. The stability of each ternary complexes was investigated and compared with those of the corresponding binary complexes in terms of the Delta log K parameter. The concentration distribution of the complexes formed in solution was evaluated.