Abstract
The stability constants of bivalent metal complexes with 7,8-dihydroxy-4-methylcoumarin, an antioxidant are reported. The variation of stability constant with different ionic strengths, temperatures, percentage of solvents, dielectric constants have been studied by potentiometric estimation of H + ions in the solution. The n and pL values, thermodynamic parameters ΔG, AH and AS have been evaluated at 25 ± 0.5 °C. The values of δ min were also evaluated. Species distribution curves are plotted to visualize the nature of 1: 1 and 1: 2 complexation equilibria at different H + ions concentration.
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