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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 12, Number 6
BKCSDE 12(6)
June 20, 1991

Title	The Kinetics of Complexation of Nickel(Ⅱ) and Cobalt(Ⅱ) Mandelates in Aqueous Solution
Author	Ki Young Choi, Sock Sung Yun*, Mal Jin Kim
Keywords
Abstract	The rate constants for the formation and dissociation of nickel(Ⅱ) and cobalt(Ⅱ) complexes with mandelate have been determined by the pressure-jump relaxation study. The forward and reverse rate constants for the mandelate complex formation reactions were obtained to be kf = 3.60 × 104 M-1s-1 and kr = 1.73 × 102 s-1 for the nickel(Ⅱ), and kf = 1.75 × l05 M-1s-1-1s-1 and 2.33 × 103 s-1 for the cobalt(Ⅱ) in aqueous solution of zero ionic strength (μ→O) at 25℃. The results were interpreted by the use of the multistep complex formation mechanism. The rate constants evaluated for each individual steps in the multistep mechanism draw a conclusion that the rate of the reaction would be controlled by the chelate ring closure step in concert with the solvent exchange step in the nickel(Ⅱ) complexation, while solely by the chelate ring closure step for the cobalt(Ⅱ) complex.
Page	629 - 632
Full Text	PDF

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