STUDIES THE INFLUENCE OF IONIC STRENGTHS OF Cu (II) AND Ni (II) METAL IONS COMPLEX WITH HYDROXY SUBSTITUTED CHALCONE BY pH METRIC TECHNIQUE

The interaction of Cu (II) and Ni (II) metal ion complex with 1-(5-bromo-2-hydroxyphenyl)-5-phenylpenta-2,4-dien-1-one chalcone (L3) has been studied at 0.02 to 0.1 mol.dm-3 ionic strength at (30 ± 0.1)0C in 70% dioxane-water mixture pH - metrically. The values of Pk [Proton - Ligand stability constant] and log k [Metal - Ligand stability constant]. are utilised to estimate the thermodynamic stability constant at zero ionic strength and to know the exact nature of complexation equilibria. Pk/log k values are found to be increasing with decreasing the values of ionic strengths. KNO3 was used to maintain the ionic strength of solution