Determination of Stability Constants of Mixed Ligand Complexes of Picolinic Acid and Other Bioactive Ligands with Zn(II) by Potentiometric Titration Method

作者：Arishy Nada M; Ammar Reda A^*; Al Warthan Abdulrhman

来源：Asian Journal of Chemistry, 2014, 26(8): 2395-2399.

DOI：10.14233/ajchem.2014.16023

• Picolinic acid
• Mixed ligand complexes
• Delta log K
• Stability constants
• Potentiometric studies

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.

• 出版日期2014-4