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KMID : 1059519880320050476
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Journal of the Korean Chemical Society
1988 Volume.32 No. 5 p.476 ~ p.482
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Kinetics and Mechanism for Aquation of cis-[Co(en)2YCl]r+ (Y = NH3, NO2-, NCS-, H2O} in Hg2+ Aqueous Solution
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Park Byung-Kak
Lim Joo-Sang
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Abstract
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Kinetic studies and theoretical investigations were made to illustrate the mechanism of the aquation of cis-[Co(en)2YCl]r+ (Y = NH3, NO2-, NCS-, H2O) in Hg2+ aqueous solution UV/vis-spectrophotometrically. The aquation of cis-[Co(en)2YCl]r+ have been found to be the second order for overall reaction as first order for each of substrate and Hg2+ catalyst. The reaction rate was increased in the order of Y=NH3 < NCS- < H2O < NO2-, which are neighboring group of Cl. The step of bond formation was found to be the rate determining one, because the net charge of central metal ion run parallel with the observed rate constant. On the basis of rate determining step, kinetic data and the observed activation parameters, we have proposed the Id mechanism for the reaction system. The rate equation derived from the proposed mechanism has been in agreement with the observed rate equation.
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