Influence of Ionic Strength on the Association and Dissociation Constants of Pr (Iii) Complexes with 3-(-2-Hydroxy-3-Iodo-5-Methyl Phenyl) 1,5-Diphenyl Pyrazoline

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The proton ligand stability constants of 3-(2-hydroxy-3-iodo-5-methylphenyl)1,5-diphenyl pyrazoline and metal-ligand stability constants of Pr .(HI) complexes with 3-(2-hydroxy-34odo-5-methylphenyl)1,5-diphenyl pyrazoline have been investigated at 0.02, 0.04, 0.06, 0.08 and 0.1 M ionic strength pH metrically. The values of pK (Proton-ligand stability constants) and log K (metal-ligand stability constants) are utilised to estimate the thermodynamic stability constants at zero ionic strength and to know the exact nature of complexation equilibria.

complexation equilibria; thermodynamic stability