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KMID : 1059519880320030227
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Journal of the Korean Chemical Society
1988 Volume.32 No. 3 p.227 ~ p.232
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Kinetic Study for Aquation of cis-[Co(en)2(NH3)Cl]2+ in Hg2+ Aqueous Solution
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Park Byung-Kak
Lee Gil-Jun
Lee Jae-Weon
Lim Joo-Sang
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Abstract
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A kinetic study was made to determine the mechanism of the aquation of cis-[Co(en)2(NH3)Cl]2+ in Hg2+ aqueous solution. The progress of reaction was followed UV/vis-spectrophotometrically by a measurement of the absorbance at a specific wave length (530nm) of cis-[Co(en)2(NH3)Cl]2+ as a function of time. The experimental results have shown that the reaction rate is dependent upon the concentration of Hg2+ that act as a catalyst. And it was found that the overall reaction proceed with second order, first order with respect to Co(Ⅲ) complex and Hg2+. Activation parameters, ΔH≠and ΔS≠, were obtained as 12.9 kcal/mol and -19.3 e.u., respectively. We have proposed a plausible reaction mechanism which is consistent with the observed rate equation.
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KEYWORD
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