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KMID : 1059519900340050438
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Journal of the Korean Chemical Society
1990 Volume.34 No. 5 p.438 ~ p.444
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The Aquation of Co(Ⅲ) Complexes in Pure Water and Mixed Water-Organic Solvents With Hg2+
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Oh Chang-Eon
Yoon Doo-Cheon
Doh Myung-Ki
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Abstract
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Observed rate constants (kobs) for Hg2+-catalysed aquation of cis-[Co(en)2(OH2)Cl]2+, [Co(NH3)5Cl]2+, cis-[Co(NH3)4(OH2)Cl]2+, and [Co(NH2CH3)5Cl]2+ were measured at various concentrations of Hg2+. The kobs was increased with increasing the concentrations of Hg2+. The kobs were related to mechanistically derived rate constants by the relationship; Rate = k2K[complex][Hg2+]. Various mixed aqueous-organic solvent have been successfully employed for Hg2+-catalysed aquation of octahedral myetal complexes. From the slope of the plot of log k againt Y (solvent ionizing power), the mechanism on the aquation of Co(Ⅲ) complexes by Hg2+ has been suggested to be Id-mechanism. The change in a rate on aquation of each Co(Ⅲ) complex was related to the ligand field parameters (Δ), for Co(Ⅲ) complexes.
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KEYWORD
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