几种芳香化合物电化学性质的研究

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。

Study on Electrochemistry Characteristics of Several Aromatic Compounds

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 chlorobenzene 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 chlorobenzene and benzoic acid solution.Maybe substituents on phenyl with different hammet constant had effect on electrochemical reaction;The ratio between oxidation peak and reduction peak in aniline solution was about 1,the reaction approached reversibility.