3-硝基苯甲酸在DMSO介质中的电化学还原

ELECTROCHEMICAL REDUCTION OF 3-NITROBENZOIC ACID IN DMSO MEDIA

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).

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 potentialelectrolysis, 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 ESRparameters 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 evalu-ated as k = 4.814×10^(-2)s^(-1).