1969 Volume 42 Issue 10 Pages 2844-2848
The kinetics of the reactions of nickel(II)-nitrilo(diacetic)propionate (NDAP) and nickel(II)-nitrilo(diacetic)isopropionate (NDAIP) complexes with ethylenediaminetetraacetate (EDTA) ions, and those of the nickel (II)-taurin-N-diacetate (TDA) complex with EDTA and trans-1,2-cyclohexanediaminetetraacetate (CyDTA) ions, have been studied polarographically in solutions with pH 4.8–6.0 at 25°C and at an ionic strength of 0.2. All the reactions except those with CyDTA proceeded through four reaction paths, and the rate constants for the reaction paths were determined. The reaction of the nickel(II)-TDA complex with CyDTA was found to proceed only through the complete dissociation of the Ni(II)-TDA complex. There was not a direct reaction of the complex with CyDTA. Consequently, the overall reaction with CyDTA became much slower than that of the same complex with EDTA. The rate constants obtained were compared with those of the similar reactions of the nickel (II)-nitrilotriacetate (NTA) complex with EDTA and CyTDA which had been reported previously. The rate of the dissociation reaction of nickel(II) complexes increased in the order: NDAIP≤NDAP<NTA<TDA. Especially, the rate of the Ni(II)-TDA complex was about 30 times that of Ni(II)-NTA complex.
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