The entropy and enthalpy values ed complex formation between 3,4,5 trihydroxybenzoic acid and Cu(II), Cr(II), Mn(II), Mg(II) and Ca(II) were determined and compared with the iron gallic acid complexes, they were found to be comparable. It was also found that they show very large entropy values. When those values were compared with other complexes of the same nature from literature, following points were noteworthy. 1. Monodentate ligands do not show any drastic entropy change with trivalent metals as compared to divalent metals. 2. Polydentate ligands show very high entropy values with tripositive metal as compared to dipositive metals. 3. Non transition metals show low entropy values with chelating agents as compared to transition metals.
S A KAZMI ,F SULTANA ,Z MAQSOOD ,
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