Abstract
The stability constants of ternary complexes of Zn(II) with picolinic acid as primary ligand and some of bioactive ligands (e.g., amino acids and peptides) as secondary ligand were determined pH-metrically at 25 degrees C and ionic strength 0.1 mol/L NaNO3 in water solution. The possible formation of ternary complexes via simultaneous mechanisms has been confirmed by comparison with constructed theoretical curves. The stability of each ternary complexes was also investigated and compared with those of the corresponding binary complexes in terms of the Delta log K parameter. In addition, the concentration distribution of the complexes formed in solution was evaluated.