湖南科技大学学报（自然科学版）

文章摘要

间位基团对二取代二苯乙烯还原电位的影响

Effect of meta-group on the reduction potentials ofdisubstituted stilbenes

DOI：

英文关键词: reduction potential stilbene meta-group substituent effect excited-state substituent constant

基金项目:国家自然科学基金资助项目(21672058；21272063)；湖南科技大学博士科研启动基金资助项目(E51468)

作者	单位
曹朝暾1,2,3，朱倩1	1.湖南科技大学化学化工学院，湖南湘潭 411201； 2.湖南科技大学理论有机化学与功能分子教育部重点实验室，湖南湘潭 411201； 3.湖南科技大学分子构效关系湖南省普通高等学校重点实验室，湖南湘潭 411201

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中文摘要:

合成了41个模型化合物，3,4’-二取代二苯乙烯(m-XSBY-p)，经1H NMR和13C NMR进行分子结构表征.测得这些模型化合物在无水乙腈中还原电位ERed，采用取代基X,Y的Hammett电子效应常数和激发态取代基常数，对测定的ERed进行定量相关分析，得到定量方程的标准偏差只有0.063 V, 落在实验误差范围内.结果表明，模型化合物的ERed受到Hammett电子效应常数和激发态取代基常数的共同影响；相比对位取代基团Y，间位取代基X的电子效应对ERed有重要影响，吸电子效应它使ERed升高，化合物易于还原；而对位基团Y的电子效应对ERed的影响很小，可以忽略.

英文摘要:

Forty-one samples of model compounds, 3,4’-disubstituted stilbenes (m-XSBY-p) were synthesized, and their molecular structures were characterized by 1H NMR and 13C NMR. The reduction potentials ERed of these model compounds were measured in anhydrous acetonitrile. For these measured ERed values, a quantitative correlation analysis was carried out by using the Hammett electronic effect constants and excited-state substituent constants of groups X and Y. A quantitative expression was obtained, in which the standard deviation is 0.063 V and is within the experimental error. The result indicates: the ERed of the model compounds were affected by both Hammett electronic effect constant and excited-state substituent constant of groups X and Y. Compared with the group Y, the effect of meta-group X on the ERed is important, and the electron-withdrawing effect of X makes a higher ERed and an easier reduction of model molecule. While the effect of para-group Y on the ERed is little and can be ignored.

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