Abstract
Abstract The kinetics of the ligand-substitution reactions of the nitrilotriacetatoniccolate(II) complexes with trans-1,2-cyclohexanediaminetetraacetate (CyDTA) ions were studied polarographically from pH 4.8 to 5.8 at an ionic strength of 0.2 and at 25°C. The reactions were found to proceed only through the dissociation reactions of the nitrilotriacetatoniccolate(II) complexes. The rate constants of the dissociation reactions were also determined. In contrast to the reactions of the same complex with ethylenediaminetetraacetate (EDTA) ions and N-2-hydroxyethylene-diaminetriacetate (HEDTA) ions, there were no direct reactions of the nitrilotriacetatoniccolate-(II) complexes with CyDTA ions. The reaction was of the first order in respect to the concentration of the nickel-complex and independent of the CyDTA concentration; the reaction of the complex with CyDTA ions was found to have the different mechanisms from the similar reaction with EDTA and HEDTA, and to be due to the steric effect of the cyclohexane ring in the CyDTA molecule.
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