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• W1991288892 abstract "The biologically relevant oxidation of l-ascorbic acid (AH2) was studied at an externally polarised 1,2-dichloroethane ∣ water interface by a combination of electrochemical and spectroscopic techniques. In the presence of an electron acceptor (chloranil) in 1,2-dichloroethane, the basic features of the voltammetric signal are dependent on the concentration ratio of the redox species. In the presence of an excess of chloranil, a reversible signal is readily observed. A similar voltammetric response is developed when the semiquinone radical anion of chloranil (Q−) is generated by homogeneous reduction in the presence of decamethylferrocene (DMFc) in the organic phase. These results suggest that Q− is formed homogeneously rather than by heterogeneous electron transfer from AH2 to Q under these conditions. However, in the presence of an excess of ascorbate, an irreversible voltammetric response is the dominant feature. Replacing chloroanil by tetracyanoquinodimethane also provides irreversible features indicating that heterogeneous electron transfer can also take place. The occurrence of both homogeneous and heterogeneous electron transfer pathways is also suggested by potential modulated reflectance (PMR) spectroscopy." @default.
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• W1991288892 date "2001-09-01" @default.
• W1991288892 modified "2023-10-03" @default.
• W1991288892 title "Mechanistic aspects associated with the oxidation of l-ascorbic acid at the 1,2-dichloroethane∣water interface" @default.
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• W1991288892 doi "https://doi.org/10.1016/s0022-0728(01)00541-1" @default.
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