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• W1976231216 endingPage "1921" @default.
• W1976231216 startingPage "1914" @default.
• W1976231216 abstract "Amino sugars have been reported to occur in plants, microorganisms, and crustaceans and are an important constituent of the soil nitrogen; even, they are protected from decomposition in soils by being incorporated into the humic acid fraction. In order to obtain a more complete insight into the interaction of metal ions with these compounds a spectroscopic and kinetic study interaction of hypervalent chromium with 2-amino-2-deoxy-d-glucopyranose (Nglc) in aqueous solution was undertaken. Kinetic studies results afforded that the oxidation of Nglc by CrVI in acid media proceeded through a mechanism combining one- and two-electron pathways for the reduction of intermediate CrIV by the organic substrate: CrVI → CrIV → CrII and CrVI → CrIV → CrIII. The proposed mechanism is supported by the observation of CrVI esters, free radicals, CrO22+ (superoxoCrIII ion) and oxo-CrV complexes as reaction intermediates. Intermediacy of free radicals and CrII in the reaction was proved by the observation of induced polymerization of acrylamide and detection of CrO22+ respectively. The experimental results indicated that CrIV was a highly reactive intermediate since its disappearance rate was much faster than CrVI and CrV. Even at low [H+], CrIV intermediate was involved in fast steps and did not accumulate in the redox reaction. Oxo-CrV–Nglc species were detected by EPR spectroscopy at low [H+]. In 0.40–1.00 M HClO4, CrV rapidly decomposed affording the reaction products, while, at pH 4.0 and 7.5, where the redox processes were very slow, five-coordinate oxo-CrV bis-chelates and mono-chelates of Nglc remained in solution and could be detected by EPR spectroscopy at room temperature. Kinetics results indicated that replacement of C2–OH by C2–NH2 retarded the oxidation reaction of Nglc by CrVI/IV thus evidencing the role of –NH2 group at C2 of the sugar frame." @default.
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• W1976231216 date "2011-06-01" @default.
• W1976231216 modified "2023-10-13" @default.
• W1976231216 title "Oxidation of 2-amino-2-deoxy-d-glucopyranose by hypervalent chromium: Kinetics and mechanism" @default.
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• W1976231216 doi "https://doi.org/10.1016/j.poly.2011.04.028" @default.
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