Abstract
The complexation behaviour of bivalent metal complexes of dehydroacetic acid-4-methyl-2-quinolylhydrazone (DAMQH) has been studied potentiometrically in 75% (v/v) aqueous dioxan medium at different ionic strengths with respect to sodium perchlorate and at different temperature in order to determine their stability constants. The method of Bjerrum and Calvin as modified by Irving and Rossotti has been used to determine the {ie497-1} andp L values.S min values which have the same significance as ‘x 2’, have also been calculated. The thermodynamic stability constants and the standard free energy change (ΔG) have also been calculated. ΔG values are negative in all cases. Thus complexation is spontaneous. The order of stability constants of bivalent metal complexes of DAMQH has been determined.
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