环糊精诱导胶束形成的TICT荧光探针法研究

环糊精与表面活性剂的相互作用研究已有诸多报导，但主要涉及环糊精与表面活性剂的包络物的稳定常数和其中主客体的化学剂量比［１，２］，至于环糊精对表面活性剂胶束化性质的影响则少见涉猎，这或许与研究方法有关，分子内扭转电荷转移激发态涉及到一个完整的电荷转移，具有很高的极性，其荧光特性显示出显著的介质性质敏感性［３］，因此将ＴＩＣＴ荧光探针法用于环糊精－表面活性剂相互作用研究可能会提供一些新的信息，本文的结

Cyclodextrin Induced Micelle Formation as Studied by TICT Fluorescent Probe

β-cyclodextrin (β-CD) induced aggregation and micelle formation of cetyltrimethylammnium bromide (CTMAB) in aqueous solution is demonstrated by the dual fluorescence of p-N, N-dimethylaminobenzoic acid (DMABOA) typical of the twisted intramolecular charge transfer (TICT). The locally excited (LE) state of DMABOA is proved to have the characteristic of intramolecular charge transfer (ICT) with a polarity higher than that of ground state but lower than that of TICT state. The peak positions of the two fluorescence bands and their intensity ratio are employed to probe the interaction of β-CD with CTMAB. It is conc1uded that β-CD induces CTMAB aggregation as well as micelle formation and may change micelle structure. The results also indicate that TICT in aqueous solution may be affected by the anisotropy or viscosity of the medium, increasing viscosity disadvantaging the TICT process.