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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Kinetics and mechanism of the Co(II)-assisted oxidation of L-ascorbic acid by dioxygen and nitrite in aqueous solution
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Kinetics and mechanism of the Co(II)-assisted oxidation of L-ascorbic acid by dioxygen and nitrite in aqueous solution

机译：水溶液中双氧和亚硝酸盐对钴（II）辅助氧化L-抗坏血酸的动力学和机理

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摘要

A detailed study of the oxidation of L-ascorbic acid by dioxygen and nitrite in water at pH 5.8 and 7.0, catalyzed by the octasulfophenyltetrapyrazinoporphyrazine complex of cobalt(II), was carried out using conventional spectrophotometric, low-temperature and high-pressure stopped-flow techniques. The Co(II) complex activates L-ascorbic acid through an intramolecular one-electron oxidation step that involves the reduction of the octasulfophenyltetrapyrazinoporphyrazine. The reaction rate strongly depends on pH due to the different redox behaviour of the L-ascorbic acid/ascorbate species present in solution. Kinetic parameters for the different reaction steps of the catalytic process were determined. The final product of the reaction between L-ascorbic acid and nitrite was found to be nitrous oxide.
机译：采用传统的分光光度法，低温高压停止-分光光度法，对钴（II）的八硫代苯基四吡嗪并四氮杂卟啉配合物催化的pH 5.8和7.0的水中的氧和亚硝酸盐氧化L-抗坏血酸进行了详细研究。流技术。 Co（II）络合物通过分子内单电子氧化步骤激活L-抗坏血酸，该步骤涉及还原八硫代苯基四吡嗪并卟啉。由于溶液中存在的L-抗坏血酸/抗坏血酸物质的氧化还原行为不同，反应速率很大程度上取决于pH值。确定了催化过程中不同反应步骤的动力学参数。发现L-抗坏血酸与亚硝酸盐之间反应的最终产物是一氧化二氮。

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