质子惰性介质中芳香族硝基化合物在铂微电极上的电化学行为

Electrochemical Behavior of Nitroaromatics on Pt Microelectrode in an Aprotic Medium

采用循环伏安法(CV)和电化学阻抗谱(EIS)技术,以铂微电极为工作电极,大面积铂丝为对电极,饱和甘汞电极为参比电极,研究了不同芳香族硝基化合物(NA)(硝基苯、硝基萘和间二硝基苯)在含有四丁基高氯酸铵(TBAP)电解质的N,N-二甲基甲酰胺(DMF)有机溶液中的电化学行为,并探讨了扫描速率、硝基数目和苯环数目等因素对硝基电化学还原特性的影响.结果表明:三种芳香族硝基化合物在铂微电极上的反应均为扩散控制的准可逆过程;苯环上硝基数目的增加容易使硝基在较低电位下还原;苯环数目的增加导致硝基的还原峰电流急剧减小.

N,N-dimethylformamide （DMF） and tetrabutyl ammonium perchlorate （TBAP） were used as a solvent and a supporting electrolyte, respectively. The working electrode was a platinum microelectrode, the auxiliary electrode was a large area platinum wire and the reference electrode was a saturated calomel electrode. The electrochemical behavior of nitroaromatics （NA） was studied by cyclic voltammetry （CV） and electrochemical impedance spectroscopy （EIS）. The effects of scan rate, numbers of benzene rings and nitro groups on the electrochemical reduction of NA were investigated systematically. The results showed that the reaction of NA on the Pt microelectrode was a quasi-reversible process controlled by the diffusion of NA. We found that NA was more electrochemically reducible when it contained more nitro groups and the reduction peak current of the nitro group decreased in the presence of more benzene rings.