The fluorescence spectra of N-Mn-A were investigated in various organic olvents selectively, excitation of the naphthalene group at λ ex=280nm resulted in two emission peaks with λem1=370nm, λem2=450nm. The former is the fluorescence of the naphthalene group and the later is the fluorescence of the anthracene group. It is proved by experiment that naphthalene only has absorption peak with it λmax at 280nm and anthracene shows no aborption at this region. So the energy is transferred from the excited naphthalene to the ground anthracene. The fluorescence spectra of the substrate (n=6,10) with vfariou concentration were investigated in different organic solvent. It is found that the ratio of the intenitie of the two fluorescence peaks is independent of the concentration, uggesting that the energy transfer occurs intramolecularly.

Key words: NAPHTHALENE P, ENERGY TRANSFER, FLUOROSPECTROPHOTOMETRY, ANTHRACENE P