Twisted Intramolecular Charge Transfer of p-N, N-Dimethylaminobenzoic Acid in Cetyltrimethylammonium Chloride Micelle

Twisted intramolecular charge transfer (TICT) is one of the hot points in condensed phase photochemistry at the present time. Most of the studies on TICT up to now, however, are performed in organic medium, which leads to a correlation that the intensity ratio of the long-wavelength TICT fluorescence band (a band) to shortwavelength normal fluorescence band (b band), I_a/I_h, increases with the medium polarity. It is unknown whether such a correlation is applicable to aqueous solution or it is in the transition from organic solvent through water. Thus a systematic study of TICT in aqueous solution and its comparison with that in organic medium are significant for the development and deepening of the theory and application of TICT. In the present note, a steady-state fluorescence spectroscopic study of TICT of p-N, N-dimethylaminobenzoic acid (DMABOA) in aqueous cetyltrimethylammonium chloride (CTMAC) micellar solution is described.