Equilibrium Studies of Some Ni(II) Ternary Complexes A Comparative Study

Abstract

pH-metric method has been used to find out log K^MA_MAL at
25 ± 0.1 °C and at constant ionic strength,   μ= 0.2 M (NaClO₄),
where A = 2,2'-bipyridyl, 2-2'-bipyridylamine, or o-phenanthroline
and L = glycollic acid, lactic acid or malic acid. The coordinating
tendencies of various ligands depend on the basicities of the ligand,
size of the ligand and chelate ring of the ligand. It is found that
along with size of secondary ligand, primary ligand size also plays
a deciding role in the stability of mixed ligand complexes. Also an
attempt is  made to correlate the coordinating tendencies of O—O,
N—O and O—S donor atoms as secondary ligands.