Effect of Added Salt on Stability of 2,3-Dibromo-1-(5-chloro-2-hydroxy-phenyl)-3- phenyl-propan-1-one and Its Ni(II) Complex at 28 ºC

Abstract

The proton-ligand stability constant of ligand (2,3-dibromo-1-(5- chloro-2-hydroxyphenyl)-3-phenyl-propan-1-one) and metal-ligand stability constants with Ni(II) metal ions were investigated in the presence of 0.02, 0.04, 0.06, 0.08 and 0.1 mol L^-1 KNO₃ pH metrically at 28 ºC. The formations of binary 1:1, 1:2 ligand-Ni(II) complexes were reported. The data obtained was utilized to estimate the thermodynamic stability constants (pK^o and log K^o) for ligand and its complex with Ni(II) ions at zero ionic strength to know the exact nature of the complexation equilibria. The different possible reactions and expected values of DZ² for corresponding dissociation or association equilibria are determined.