Behavior of Copper Ion to Ascorbic Acid

概要

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When the effect of CuCl2 on ascorbic acid was analyzed by adding CuCl2 to ascorbic acid, it was found that it formed a Cu+ chelate compound after being oxidized by dehydroascorbic acid.When the entropy of chelate formation and the low pressure activation energy were checked by means of polarography, we observed that the inductive dipole efficiency was higher than the dipole efficiency of the chelate itself in the activation stage in the electric field of an electrolytic electrode.When we further made an analysis of the molecular orbital system to make clear the chelate structure, we came to the conclusion that the 2px and 2py orbitals of oxygen atom of the Cu ion contribute to the formation of chelate.Ascorbic acid has a reduction property as it has an enediol group in its molecule. When the metallic ion C-O is present, acceleration of oxidation and decomposition reduction are observed. Ogata et al., (1) studied the autoxidation reaction from the viewpoint of dynamics by adding CuCl2, Cu(NO3)2 and CuSO4, and observed the remarkable effect of CuCl2. The author added CuCl2 to the aqueous solution of ascorbic acid, and observed that the acid formed a Cu chelate compound and that CuCl2 behaved like Cu2+.
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