化学学报 ›› 1991, Vol. 49 ›› Issue (6): 600-604. 上一篇    下一篇

研究论文

光敏电子转移异构反应中的盐效应

王向东;张宝文;曹怡   

  1. 中国科学院感光化学研究所
  • 发布日期:1991-06-15

Salt effect in photoinduced electron transfer isomerization reaction

WANG XIANGDONG;ZHANG BAOWEN;CAO YI   

  • Published:1991-06-15

本文利用四正丁基四氟硼酸铵为探针, 研究了顺式芪和四环烷的9,10-二氰基蒽敏化光异构化的反应机理, 加入四正丁基四氟硼酸铵明显加快顺式芪的异构反应而减慢四环烷的反应。荧光猝灭及激光闪光光解实验证明四正丁基四氟硼酸铵能促进电荷分离过程而生成离子自由基对。从而证实顺式芪的异构化反应是经由离子自由基的历程, 而四环烷则是通过激基复合物机理。

关键词: 铵化合物, 光敏化, 反应机理, 正丁基, 自由基反应, 有机氟化合物, 异构化反应, 硼酸 P, 探针, 氰化合物

N-Bu4NBF4 was used as a probe to investigate the mechanism of 9,10-dicyanoanthracene sensitized isomerization of cis-stilbene and quadricyclane. Addition of n-Bu4NBF4 accelerated the isomerization of cis-stilbene dramatically but retarded the reaction of quadricyclane. Fluorescence quenching and flash photolysis experiment proved that n-Bu4NBF4 could cause the dissociation of the exciplex to form separated radical ions effectively. It was verified that the isomerizations of cis-stilbene and quadricyclane are via radical ion and via the exciplex resp.

Key words: AMMONIUM COMPOUND, PHOTOSENSITIZATION, REACTION MECHANISM, BUTYL GROUP, FREE RADICAL REACTION, ORGANO FLUORINE COMPOUNDS, ISOMERIZATION REACTION, BORIC ACID P, PROBES, CYANOGEN COMPOUNDS

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