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KMID : 1059519880320040318
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Journal of the Korean Chemical Society
1988 Volume.32 No. 4 p.318 ~ p.322
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Pressure Dependence on the Aquation of s-cis-[Co(ee)Cl2]+ and s-cis-[Co(eee)Br2]+ ions
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Chung Jong-Jae
Baek Sung-Oh
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Abstract
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We studied the aquation reaction of s-cis-[Co(eee)Cl2]+] and s-cis-[Co(eee)Br2]+ complex ions under the various temperatures and pressures. In these complexes eee is NH2-CH2CH2-S-CH2CH2-NH2. The rate law of the aquation reactions of these two complexes obeys Rate = kobsd[CO(Ⅲ)], where rate constants of s-cis-[Co(eee)Cl2]+ and s-cis-[Co(eee)Br2]+ respectively are 0.687 × 10-4sec-1 and 4.10 × 10-4sec-1 in condition of 0.1M HClO4 and 40℃. In the same condition, the activation entropies of s-cis-[Co(eee)Cl2]+ and s-cis-(Co(eee)Br2]+ complexes respectively are -15.5 eu and -7.54eu, and the activation volumes are -4.6cm3mole-1 and -4.2cm3mole-1. From these data, we could infer the mechanism of the aquation reaction as the interchange dissociation (Id) mechanism.
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