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The kinetics of complexation of nickel(II) and cobalt(II) with cinchomeronate in aqueous solution

✍ Scribed by Sock Sung Yun; Ki Young Choi

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
419 KB
Volume
21
Category
Article
ISSN
0538-8066

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✦ Synopsis

The pressure-jump method has been used to determine the rate constants for the formation and dissociation of nickel(I1) and cobalt(I1) complexes with cinchomeronate in aqueous solution at zero ionic strength. The forward and reverse rate constants obtained are k, = 2.27 x lo6 M-' s-' and k, = 3.81 x 10' s-' for the nickel(I1) complex and k , = 1.23 x lo7 M-' s-' and k, = 2.66 x 1 0 ' s-' for the cobalt(I1)) complex a t 25Β°C.

The activation parameters of the reactions have also been obtained from the temperature variation study. The results indicate that the rate determining step of the reaction is a loss of a water molecule from the inner coordination sphere of the cation for the nickel(I1) complex and the chelate ring closure for the cobalt(I1) complex. The influence of the pyridine ring nitrogen atom of the cinchomeronate ligand on the complexation of cobalt(I1) ion is also discussed.

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