高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (4): 552.

• 论文 • 上一篇    下一篇

水溶液中的分子内扭转电荷转移──阴阳离子胶束中对二甲基氨基苯甲酸分子内扭转电荷转移的比较研究

江云宝, 许金钩, 黄贤智   

  1. 厦门大学化学系, 现代分析化学研究所, 厦门, 361005
  • 收稿日期:1993-04-12 修回日期:1993-10-11 出版日期:1994-04-24 发布日期:1994-04-24
  • 通讯作者: 江云宝,男,31岁,博士,副教授.
  • 作者简介:江云宝,男,31岁,博士,副教授.
  • 基金资助:

    国家自然科学基金委员会青年基金;福建省自然科学基金

Twisted Intramolecular Charge Transfer in Aqueous Solution ──A Comparative Study of TICT or p-Dimethylaminobenzoic Acid in Cationic and Anionic Micelles by Its Dual Fluorescence

JIANG Yun-Bao, XU Jin-Gou, HUANG Xian-Zhi   

  1. Department of Chemistry, Institute of Analytical Chemistry, Xiamen University, Xiamen, 361005
  • Received:1993-04-12 Revised:1993-10-11 Online:1994-04-24 Published:1994-04-24

摘要: 在阳离子表面活性剂CTMAB水溶液中,对二甲氨基苯甲酸(DMABOA)的分子内扭转电荷转移(TICT)荧光带随着胶束的形成而显着蓝移,同时伴随着TICT荧光带与正常荧光带强度比Ia/Ib和总荧光强度If的增大;而阴离子表面活性剂SLS胶束的形成并未引起TICT荧光带位置和Ia/Ib的变化,仅使If提高(较在CTMAB胶束中的小).实验发现在胶束疏水核中的TICT行为与纯有机溶剂中不同,DMABOA与CTMAB胶束的疏水相互作用和静电作用是协同的。

关键词: 分子内扭转电荷转移, 阴阳离子胶束效应, 水溶液, 对二甲基氨基苯甲酸, 双重荧光

Abstract: In the aqueous solution of cationic surfactant cetyltrimethylammonium bromide (CTMAB), the TICTfluorescence of DMABOAis dramatically shifted to blue upon the micelle formation, accompanied by an enhancement of the fluorescence intensity ratio of TICTband to normal band (Ia/Ib) and of total fluorescence intensity.While the formation of micelle of anionic surfactant sodium lauryl sulfate (SLS) does not induce the variations of the position of TICTband and of Ia/Ib, only causes a relatively minor enhancement of total fluorescence intensity.It is pointed out that the TICTbehavior in the hydrophobic core of micelle is different from that in pure organic solvent,i.e., decrease of polarity results in increased Ia/Ib, and the electrostatic interaction and hydrophobic interaction between DMABOA and CTMAB micelle are synergetic.

Key words: Twisted intramolecular charge transfer, Cationic and anionic micellar effects, Aqueous solution, p-Dimethylaminobenzoic acid, Dual fluorescence

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