INTRAMOLECULAR ENERGY-TRANSFER STUDY OF N APHTHALENE ANTHRACENE END LABELED POLYMETHYLENE

The fluorescence spectra of N-M(n)-A were investigated in various orga nic solvents selectively, excitation of the naphthalene group at lambd a(ex) = 280 nm resulted in two emission peaks with lambda(em1) = 370nm , lambda(em2) = 450nm, The former is the fluorescence of the naphthale ne group and the later is the fluorescence of the anthracene group, It is proved by experiments that naphthalene only has absorption peak wi th its lambda(max) at 280nm and anthracene shows no absorption at this region. So the energy is transferred from the excited naphthalene to the ground anthracene, The fluorescence spectra of the substrates (n = 6,10) with various concentration were investigated in different organ ic solvents, It is found that the ratio of the intensities of the two fluorescence peaks is independent of the concentration, suggesting tha t the energy transfer occurs intramolecularly.