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Vol. 26 No. 8 (2014): Vol 26 Issue 8

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

https://doi.org/10.14233/ajchem.2014.16023
Nada M. Arishy
Department of Chemistry, College of Science, King Saud University, P.O. Box 22452, Riyadh 11495, Saudi Arabia
Reda A. Ammar
Department of Chemistry, College of Science, King Saud University, P.O. Box 22452, Riyadh 11495, Saudi Arabia ;Department of Chemistry, College of Science, Al Azhar University, Cairo, Egypt
Abdulrhman Al-Warthan
Department of Chemistry, College of Science, King Saud University, P.O. Box 22452, Riyadh 11495, Saudi Arabia

Corresponding Author(s) : Reda A. Ammar

rammar@ksu.edu.sa

Asian Journal of Chemistry, Vol. 26 No. 8 (2014): Vol 26 Issue 8

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 °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 D log K parameter. In addition, the concentration distribution of the complexes formed in solution was evaluated.

Keywords

Picolinic acid Mixed ligand complexes D log K Stability constants Potentiometric studies
M. Arishy, N., A. Ammar, R., & Al-Warthan, A. (2014). Determination of Stability Constants of Mixed Ligand Complexes of Picolinic Acid and Other Bioactive Ligands with Zn(II) by Potentiometric Titration Method. Asian Journal of Chemistry, 26(8), 2395–2399. https://doi.org/10.14233/ajchem.2014.16023
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