物理化学学报 >> 1990, Vol. 6 >> Issue (05): 523-527.doi: 10.3866/PKU.WHXB19900504

研究论文 上一篇    下一篇

3-硝基苯甲酸在DMSO介质中的电化学还原

吴仲达; 赵明; 矫海洋   

  1. 北京师范大学化学系
  • 收稿日期:1989-09-02 修回日期:1989-11-23 发布日期:1990-10-15
  • 通讯作者: 吴仲达

Electrochemical Reduction of 3-Nitro-Benzoic Acid in DMSO Media

Wu Zhong-Da; Zhao Ming; Jiao Yang-Yang   

  1. Chemistry Department, Beijing Normal University
  • Received:1989-09-02 Revised:1989-11-23 Published:1990-10-15
  • Contact: Wu Zhong-Da

摘要: 本文用循环伏安法、控制电位电解和ESR方法结合, 研究了3-硝基苯甲酸(3-NBA)在DMSO介质中, Pt电极上的电化学还原过程。结果表明, 3-硝基苯甲酸通过三电子还原生成一种亚硝基自由基。观测到了自由基ESR谱的超精细结构。确定了ESR模拟谱的参数: a_1~N=10.91G, a_2~H=1.12G, a_4~H=a_6~H=3.38G, a_5~H=3.96G. 估算了自由基衰变速度常数k=4.814×10~(-2)s~(-1).

Abstract: The electrochemical reduction of 3-nitro-benzoic acid (3-NBA) has been investi-gated on Pt electrode in DMSO media by cyclic voltammetry and controlled potential electrolysis, in combination with ESR spectroscopy. The results show that 3-nitro-ben-zoic acid is reduced through a three-electron process to a of species of nitroso group. Hyperfine structures of ESR spectrum of the free radical were observed. The ESR parameters of the simulation have been determined as a_1~N = 10.91G, a_2~H=1.12G, a_4~H=a_6~H=3.38G, a_5~H=3.96G. The rate constant of the decay of free radical was evaluated as k=k=4.814×10~(-2)s~(-1).