全合成双分子膜分子激发态能量转移的研究

Studies on Excitation Energy Transfer of Completely Synthesized Bilayer Membrane Containing Biphenyl Moiety

研究了全合成双分子膜内的分子激发态能量转移行为，给体为囊泡双亲分子上的联苯生色基，受体是通过静电相互作用结合在囊泡表面上的荧光黄阴离子．荧光黄猝灭联苯的荧光强度符合Ｓｅｒｎ－Ｖｏｌｍｅｒ猝灭定律．探讨了囊泡在能量转移过程中的组织作用、转移效率与机制．通过研究由静电作用结合在囊泡表面上的荧光黄给体和四苯基卟啉受体间的能量转移，改善了光的输出，扩展了光波的覆盖范围．全合成双分子膜是能量转移的有效介质和良好的膜模拟剂．

Intermolecular excitation energy transfer has been investigated in the binary mixture system mediated by completely synthesized bilayer membrane containing biphenyl moiety(DBBTAB). The donor, a biphenyl group, was embeded in the interior of the bilayer membrane. The acceptor, fluorescein sodium salt, two negatively charged polar groups, was attracted electrostatically to the positively charged surface of the DBBTAB vesicles. The efficiency of the energy transfer was found to be good. Fluorescein quenched the fluorescence intensity of the biphenyl, which fitted a Stern Volmer relationship over the concentration ranges of 0￣8×10 -5 mol/L. The functionallization of the vesicles in the energy transfer was explored, and energy transfer mechanism was discussed too. Furthermore, energy transfer from the fluorescein donor to tetraphenylporphyrin sulfated sodium acceptor, was also observed in the same system. The energy transfer improved light efficiency and extended the spectral region. The experiment results imply that the DBBTAB vesicle is better media for energy transfer in dye laser and good membrane mimic agent.