FUNCTIONALITY AND STRUCTURE OF POLYMERS .1. PHOTOREACTION AND FLUORESCENCE OF POLYESTERS HAVING PENDANT ANTHRYL GROUPS

Various polyesters having pendant (9-anthryl)methyl groups were prepared from 2-(9-anthryl)methylpropane-1,3-diol and the esters or chlorides of dicarboxylic acids. Although the absorption spectrum of the anthryl group is not influenced by the change in the environment in which the anthryl group is located, the fluorescence spectra show characteristic change reflecting the environment around the chromophore. Dimer, aggregates, or excimer fluorescence of anathryl groups and energy transfer from naphthyl to anthryl groups for PA-1N are discussed. The effects of polymer structure on the photoreaction are discussed on the basis of information on molecular interactions obtained by fluorescence spectroscopy. The fraction of intramolecular cyclization was estimated from dependence of the rate of photoreaction on the concentration of the polyesters. The results are discussed in terms of the structure-functionality relationship in polymeric systems.