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KMID : 1059519860300040377
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Journal of the Korean Chemical Society
1986 Volume.30 No. 4 p.377 ~ p.382
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Racemization of Optical Active tris-Oxalatocobaltate (III) Ion in Mixed Solvants
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Lee Dong-Jin
Doh Myung-Ki
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Abstract
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Racemic tris-oxalatocobaltate (Ⅲ) complex ions were optically resolved by an optical active complex, Δ-tris-ethylenediamine cobalt (Ⅲ), and then racemization of Λ-[Co(ox)3]3- obtained was investigated in various mixed solvent such as water-organic solvent (organic solvents=ethanol, iso-propyl alcohol, acetone, and dioxane). The rate of racemization was increased with following order; water < ethanol < acetone < isopropyl alcohol < dioxane; which is the same order for polarizability of organic solvent added. Considering ΔH≠, ΔS≠ and above facts for the racemization of Λ-[Co(ox)3]3-, it seems to be twist mechanism of plausible mechanisms.
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