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| - Reduction of Vanadium(V) by l-Ascorbic Acid at Low and Neutral pH: Kinetic, Mechanistic, and Spectroscopic Characterization
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| - The reaction of l-ascorbic acid with vanadium(V) over a broad pH range was investigated. Reduction was observed between pH 0.40 and 7.0. Three vanadium(IV) complexes were found using EPR that support both inner- and outer-sphere reaction pathways.
- l-Ascorbic acid interacts with vanadium(V) over the pH range of 0.4−7.0 to form three different coordination complexes.Both inner- and outer-sphere electron-transfer pathways are proposed to form vanadium(IV) complexes withl-ascorbate or dehydroascorbate, respectively. Effects of the pH on the coordination of l-ascorbic acid to thevanadium(V) center were observed and are presumably related to the speciation of the vanadium(V) ion. Threevanadium(IV) complexes were observed using ambient-temperature electron paramagnetic resonance spectroscopy.Two of these complexes are proposed to be vanadium(IV) l-ascorbate complexes, and one is consistent with avanadium(IV) dehydroascorbic acid complex proposed earlier. These reduction reactions will occur under physiologicalconditions and could be important to the reduction of vanadium(V)-containing coordination complexes used asinsulin-enhancing agents for treatment of diabetes.
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