邻氯硝基苯和邻硝基甲苯在Cu-Hg电极上的电还原行为  

Electrochemical reduction of o-chloronitrobenzene and o-nitrotoulene on Cu-Hg electrode

作　　者：马淳安[1] 葛小芳[1] 朱英红[1] 

机构地区：[1]浙江工业大学绿色化学合成技术国家重点实验室培育基地,浙江杭州310032

出　　处：《浙江工业大学学报》2005年第4期357-361,共5页Journal of Zhejiang University of Technology

基　　金：国家基础研究重大项目(973)前期研究专项(2003CCA01300);国家自然科学基金(20376074)

摘　　要：采用循环伏安、线性伏安扫描及恒电位电解等测试手段,研究了邻氯硝基苯和邻硝基甲苯两种邻位取代硝基化合物在酸性电解液中的电还原性能,讨论了邻氯硝基苯和邻硝基甲苯在电还原过程中酸浓度以及反应物浓度等因素对电还原反应性能的影响,并探讨了可能的反应机理.研究表明:邻氯硝基苯和邻硝基甲苯在电还原过程中属不可逆反应,且都由扩散步骤控制;邻氯硝基苯由于氯的吸电子效应,可使硝基在较正的电位下进行电还原,且还原峰电流较大;邻氯硝基苯在电还原过程中生成的产物主要是氧化偶氮苯类化合物,而邻硝基甲苯经电还原后生成的产物是酚类化合物.The effects of the acid strength and reactants concentration on the electroreduction properties of o-chloronitrobenzene and o-nitrotoulene in sulfuric acid solution has been studied by quasi-steady-state polarization, constant potential electrolysis and cyclic voltammery methods. The probable mechanism was studied. It was found that the electroreduction reactions of ochloronitrobenzene and o-nitrotoulene were irreversible and the reaction process was controlled by diffusion. The o-chloronitrobenzene could be reduced at more positive potential and showed strongger current due to the electronic effect of withdrawing group compared to that of onitrotoulene. The electroreduction product of o-chloronitrobenzene was azoxy compound and it was phenol compound for o-nitrotoulene.

关 键 词：邻氯硝基苯 邻硝基甲苯 电化学还原 

分 类 号：O643.32[理学—物理化学]