| 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. |
| 关键词: 还原电位 二苯乙烯 间位基团 取代基效应 激发态取代基常数 |
| DOI： |
| 分类号:O621.1 |
| 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) |
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| Effect of meta-group on the reduction potentials ofdisubstituted stilbenes |
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Cao Zhaotun1,2,3, Zhu Qian11,2,3
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1. School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201,China;2. Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education,
Hunan University of Science and Technology, Xiangtan 411201,China;3. Key Laboratory of QSAR/QSPR of Hunan Provincial University, Hunan University of Science and Technology, Xiangtan 411201,China
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| Abstract: |
| 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. |
| Key words: reduction potential stilbene meta-group substituent effect excited-state substituent constant |
