INTRAMOLECULAR ENERGY-TRANSFER IN ORGANIZED ASSEMBLES

A series of bichromophor compounds N-Hn-A( [GRAPHICS] N = 2,4,6,8,10) has been synthesized by ourselves for the investigation of energy Transfer. Bichromophore compound and gamma- CD or beta- CD aqueous solution are made up at the molar ratio of 1:1. It has been discovered that the efficiency of the energy transfer of the compound (n = 10) in the gamma- CD is obviously higher than that in the beta- CD. This means that the cavity of the gamma- CD is more suitable for the substrate than that of the beta- CD. Three kinds of associate solution (C12As sodium dodecylsulfonate, CTAB cetyltrimethylammonium bromide, AOT bis (2-ethylhexyl) sodium sulfosuccinate) have been used. The study of the series compounds (N-Hn-A) by means of fluorescence spectra has shown that the high efficiency energy transfer occurs in the microemulsion and micellar systems and the low efficiency energy transfer in the liquid crystal. These findings demonstrate that if the molecule of the substrate is set in the core of the microemulsion, the distance between the two chromophores is very short, in contrast, if the molecule is set in the lameller liquid crystal, the distance between the two chromophores is relatively long and the efficiency of the energy transfer in the latter system is very low.