Abstract

A. B. Patil

The stability constants of Mn (II), Co (II), Ni (II), Cu (II) and Zn (II) metal ions with pyridoxine hydrochloride (PHC) and ethambutol hydrochloride (EHC) has been studied by pH-metric technique at 0.1 M (KNO3) ionic strength at 302 ± 0.5 K in aqueous medium. The data obtained were used to evaluate the values of proton-ligand and metal-ligand stability constants using Irving-Rossotti titration technique. Mixed- ligand complex studies of these metal ions using aspartic acid (ASP) and glutamic acid (GLU) as primary ligands and PHC and EHC as secondary ligands also have been carried out pH-metrically at the same conditions. The Irving-Williams order of stability constants was observed in case of binary as well as ternary complexes.

Ternary complexes; transition metal ions; pyridoxine hydrochloride; ethambutol hydrochloride; aspartic acid and glutamic acid

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