FLUORESCENCE ENHANCING AND ENERGY-TRANSFE R ON BIMOLECULAR LAYER INDUCED BY AGGREGATION

Single chain benzalaniline containing ammonium amphiphiles formed vesi cle bilayers in the aqueous solution. Being a kind of chromphore 1 the benzalaniline group embeded in amphiphiles is active for absorption a nd fluorescence. No very strong excitation and emission intensities we re determined;in ethanol dispersion, but the phenomenon was found in t he aqueous solution, that is tight aggregation of bimolecular layer in duced fluorescence enhancing, The reason is that the tight aggregation made the molecule arrangement orderly so that little excitation energ y was exhausted by nonradiative transfers such as thermal collision, c onformation divert and so on. This process is very favorable for energ y transfer because it was not observed in I;quid crystal state and in ethanol dispersion. The result reveals that more orderly arrangement o f amphiphiles in bilayers is benefit to controlling energy transfer an d increasing the transfer effect across membranes.