几种芳香化合物电化学性质的研究

Study on Electrochemistry Characteristics of Several Aromatic Compounds

采用循环伏安法考察了苯胺在铂电极上不同浓度、pH值和不同扫描速率等条件下的电化学反应特性。结果表明:在中性条件下,苯胺未出现明显的氧化还原峰,氯苯、苯甲酸分别出现了2个氧化峰和1个还原峰;随着硫酸浓度的增大,氯苯和苯甲酸峰电流密度呈减小趋势,而苯胺峰电流密度增大,这可能与氨基、氯、羧基的Hammet常数和溶液的pH值有关,Hammet常数越小易于发生亲电攻击;苯胺的氧化峰和还原峰相比大约为1,接近于可逆反应,苯胺的可逆性最强。

Electrochemistry characteristics of three kinds of aromatic compounds on platinum electrode were studied by cyclic voltammetry. The conclusions were as follows：in neutral aniline solution there were no obvious peaks, but in ehlorobenzene and benzoic acid solution there were two oxidation peaks and one reduction peak; With the sulfuric acid concentration increased, current density grown up in aniline, but decreased in ehlorobenzene and benzoic acid solution. Maybe substituents on phenyl with different hammer constant had effect on eleetrochemical reaction; The ratio between oxidation peak and reduction peak in aniline solution was about 1, the reaction approached reversibility.