Abstract
The nature of the mixed complexes of Cu(II) with bidentate ligands such as carboxylic and phenolic acids, was studied in aqueous medium by carrying out potentiometric titrations of the metal ion with the various chelating agents. Evidence for the formation of 1:1 chelates of Cu(II) with different ligands such as succinic, phthalic, 5-sulfosalicylic acid, 3:5-dinitrosalicylic acid, adipic and 4-hydroxy salicylic acids was found. Cu(II) in the presence of equimolar concentrations of two ligands formed mixed ligand chelates containing 1:1:1 molar ratios of Cu(II) and the two ligands. The formation constants of the complexes were calculated. It was observed that, (i) log K 5 >log K 2 + log K 2 when both ligands are carboxylic acids and (ii) log K 5 < Log K 1 + log K 2 when both the ligands are phenolic acids or when one ligand is a phenolic and the other a carboxylic acid.
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