INTRAMOLECULAR EXCIMERS AND ENERGY MIGRATION IN POLYESTERS WITH 2,6-NAPHTHALENE DICARBOXYLIC-ACID UNITS SEPARATED BY SPACERS OF 1-4 ETHYLENE-OXIDE UNITS

The fluorescence has been measured in dilute solution and in glassy poly(methyl methacrylate) for polyesters of 2,6-naphthalene dicarboxylate and HO-(CH2CH2O)m-H, m = 1-4. The model compounds in which the glycol connects two molecules of 2-naphthoate were also studied. Intramolecular energy migration is implied by the anisotropy of the fluorescence in rigid media. The results are consistent with Forster radii of about 12 angstrom in the model compounds and 14 angstrom in the polymers, as found previously for a similar series based on HO-(CH2)m-OH instead of HO-(CH2CH2O)m-H.