The fluorescence has been measured in dilute solution and in glassy poly(methyl methacrylate) for polyesters in which 2,6-naphthalene dicarboxylate is the rigid unit, and (CH2)= (m=2-6) is the flexible spacer. Bichromophoric compounds in which the same flexible spacer connects two molecules of 2-naphthoate were also studied. The anisotropy in the rigid medium demonstrates the existence of intramolecular energy migration, which becomes more important as m decreases from 6 to 2. The F6rster radius is ~ 12 A in the bichromophoric compounds and 14 A in the polyesters.
Посилання на статтю:
Intramolecular energy migration in polyesters from 2,6-naphthalene dicarboxylic acid: polarization of fluorescence in the polymers and in bichromophoric model compounds / Francisco Mendicuti and Enrique Saiz // Polymer. – 1992. – Vol 33. – P. 4908-4912.