高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (9): 1707.

• 研究简报 • 上一篇    下一篇

环己烷中苯甲酰苯胺的双重荧光——分子内电荷转移的直接光谱证据

张煊, 马丽花, 孙向英, 王朝杰, 黎朝, 吴芳英, 江云宝   

  1. 厦门大学化学系, 现代分析科学教育部重点实验室, 厦门 361005
  • 收稿日期:2001-05-04 出版日期:2002-09-24 发布日期:2002-09-24
  • 通讯作者: 江云宝(1963年出生),男,博士,教授,博士生导师,主要从事荧光光谱分析研究.
  • 基金资助:

    国家自然科学基金(批准号:2997502320175020);教育部优秀青年教师奖励计划(2001年);德国大众基金(批准号:I/77072)资助

Dual Flrorescence of Anilino Substituted Benzanilides in Non-polar Solvent Cyclohexane——Direct Spectroscopic Evidence for the Excited-state Charge Transfer

ZHANG Xuan, MA Li-Hua, SUN Xiang-Ying, WANG Chao-Jie, LI Zhao, WU Fang-Ying, JIANG Yun-Bao   

  1. Department of Chemistry and the MOE Key Laboratory of Analytical Sciences, Xiamen University, Xiamen 361005, China
  • Received:2001-05-04 Online:2002-09-24 Published:2002-09-24

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关键词: 双重荧光, 分子内扭转电荷转移, 苯甲酰苯胺

Abstract: The fluorescence spectra in cyclohexane of a series of benzanilides(BAs) with different para substituents at the anilino moiety revealed that BAs emitted dual fluorescence, with one normal weak emission at ca . 330 nm and an abnormally long wavelength emission ranging from 460 to 550 nm. The long wavelength emission was found strongly dependent of the electron donating capacity of the substituent at the anilino moiety and a stronger electron donating substituent led to a red shift in the emission. The energies of the long wavelength emission of the BAs were correlated to the oxidation potentials of the donors, ED/D+, and a nice linear correlation was found with a slope of +066, which clearly pointed to the charge transfer character of the emissive state for the long wavelength emission and the high decoupling extent of the charges in the CTstate. This is the first report that shows the direct evidence for the CTnature. The results might be of significance in understanding the photophysics of peptide and protein and in designing novel fluorescent chemosensors.

Key words: Dual fluorescence, Twisted intramolecular charge transfer, Benzanilides

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