pH-metric studies on ternary metal complexes of some amino acids and benzimidazole
M T El-Haty1, A H Amrallah, R A Mahmoud
1Chemistry Department, Faculty of Science, Aswan, Egypt.
Abstract:
The stability constants of binary and ternary complexes of copper(II) and nickel(II) with some amino acids (d-histidine, dl-serine, lysine) as primary ligands and benzimidazole as a secondary ligand were determined pH-metrically. The study was conducted in 10% (v/v) ethanol-H(2)O medium and at an ionic strength of 0.1 mol dm(-3) NaNO(3) at 20 +/- 1 degrees C, Values of Delta log K were discussed on the basis of statistical considerations and the nature of the species formed. The stability of the binary and mixed ligand complexes are discussed in terms of the molecular structure of benzimidazole and the amino acids as well as the nature of the metal ion.
Related Concept Videos
Complexometric Titration: Ligands
EDTA: Chemistry and Properties
Complexometric Titration: Overview
Metal-Ligand Bonds
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
EDTA: Auxiliary Complexing Reagents
Complexation Equilibria: The Chelate Effect


