Detection of a complex intermediate in the oxidation of ascorbic acid by the copper(2) ion

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  • 早川 勝光
    Department of Chemistry, Faculty of Science, Kagoshima University
  • 林 豊
    Department of Chemistry, Faculty of Science, Kagoshima University

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  • Detection of a complex intermediate in the oxidation of ascorbic acid by the copper(II) ion.
  • Detection of a complex intermediate in

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A complex intermediate of the copper(II) ion with the ascorbate anion was detected by using a rapid scanning spectrophoto-meter with a stopped-flow apparatus. The intermediate was confirmed to be a copper(II) complex ion by electron paramagnetic resonance measure-ments. The dependence of the absorbance of the complex on the con-centrations of reactants and on the pH of the reaction solutions indicates that the complex is Cu(II)Ha+ where Ha is the ascorbate anion ligand. The absorption maximum, the molar absorption coefficient, and the formation constant of the complex are 410nm, 33±1 M-1 cm-1 at 420nm, and 42±6M-1, respectively. The values are comparable to those in the other metal complexes of the ascorbate anion.

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