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化学学报
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化学学报 ›› 1991, Vol. 49 ›› Issue (8): 821-826. 上一篇    下一篇

研究论文

超氧负离基研究: 无水乙腈中超氧负离子基的稳定性及其捕获

王玉琨;刘庆彬;刘有成   

  1. 兰州大学应用有机化学国家重点实验室
  • 发布日期:1991-08-15

Studies on superoxide---a study on the stability and spin trapping of superoxide anion radical in acetonitrile

WANG YUKUN;LIU QINGBIN;LIU YOUCHENG   

  • Published:1991-08-15

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503

被引次数

2

考察了影响无水乙腈中超氧负离子基(O2^-)稳定性的因素,发现氧促使乙腈中O2^-浓度迅速减小,通过产物鉴定和UV动力学分析提出氧促O2^-与乙腈反应的可能机理。研究了O2^-与2,2,6,6-四甲基-4-羟基-N-溴哌啶(NB)的反应,表明NB可望成为非水溶剂中O2^-的专一捕获剂。

关键词: 紫外分光光度法, 哌啶 P, 稳定性, 溴化合物, 羟基, 非水溶液, 乙腈, 无水, 捕集剂, 超氧化物

The factors affecting the stability of superoxide anion (O2?) in acetonitrile have been examined In the presence of oxygen O2? decayed rapidly. Oxygen uptake in the reaction and anal. of the products showed that mol. oxygen participated in and accelerated the reaction between O2? and acetonitrile. A possible mechanism based on the kinetic anal. is suggested. In the reaction of O2? with 2,2,6,6-tetramethyl-4-hydroxy-N-bromopiperidine (NB), the only product found is 2,2,6,6-tetramethyl-4-hydroxypiperidinyl-1-oxy radical which is characterized by its typical ESR spectrum. The reaction rate constant k1 of 1.33 ?102 dm3 mol-1 s-1 was determine by the UV stopped-flow technique. The results suggest that NB may be used as a specific spin trapping reagent.

Key words: ULTRAVIOLET SPECTROPHOTOMETRY, PIPERIDINE P, STABILITY, BROMINE COMPOUNDS, HYDROXY GROUP, NON-AQUEOUS SOLUTION, ACETONITRILE, ANHYDROUS, CATCHERS, SUPEROXIDE

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