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

Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (4): 552.

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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

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

Abstract

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 (I_a/I_b) 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 I_a/I_b, 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 I_a/I_b, 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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JIANG Yun-Bao, XU Jin-Gou, HUANG Xian-Zhi. 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[J]. Chem. J. Chinese Universities, 1994, 15(4): 552.

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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

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