Abstract
The mixed-ligand chelates of Zn(II) with aminobutanedioic (aspartic), 2-aminopropanedioic (glutamic), pyridine 2,3-dicarboxylic (quinolinic), pyridine 2,6 dicarboxylic (diplicolinic), mercapto butanedioic (thiomalic) and thiodiacetic (thiodiglycolic), acids have been investigated potentiometrically at 30°C and 0.1 M (NaClO 4) ionic strength. The mixed-ligand chelate is formed by a stepwise equilibria when quinolinic and dipicolinic acids are used as primary ligands. The mixed-ligand chelate formation is occured in aspartic-thiomalic, aspartic-thiodiglycolic, glutamic-thiomalic, glutamic-thiodiglycolic acid systems by simultaneous equilibrium. The high stability of mixed-ligand chelate is explained on the considerations of structural aspects. It is concluded that in the mixed-ligand chelation, the coordination number six of Zn(II) is fulfilled.
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