Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Kinetics of Substitution Reactions Involving Metal Complexes. XI. The Reactions between Nickel(II) Ions and Copper(II)- and Cobalt(II)-Nitrilotriacetate Complexes
Nobuyuki TanakaMasaru Kimura
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1967 Volume 40 Issue 9 Pages 2100-2106


The kinetics of the substitution reaction of nickel(II) and copper(II)-nitrilotriacetate complexes and that of nickel(II) and cobalt(II)-nitrilotriacetate complexes in acetate buffer solutions have been studied by a similar method in principle to that reported previously. The reactions were treated as to proceed through both hydrated metal ions and monoacetato complexes. The rate constants of eight reaction paths, of which four involve hydrated nickel(II) ions and the others, monoacetatonickel(II) complexes, were determined at ionic strength 0.2 at 0°C. The backward reactions were found to proceed also through eight reaction paths in which the dissociation of Ni(II)-nitrilotriacetate complexes is rate-determining. The values of rate constants obtained for the forward and the backward reactions indicate that all the reactions proceeding through monoacetatonickel(II) complexes are faster than the corresponding reactions through hydrated nickel(II) ions.

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