Study of transfer processes of electronic excitation energy in polymers with conjugated double bond systems

Abstract

By the method of external quenchers, the mechanism of transfer of electronic excitation energy in various PCS has been investigated; it has been found that, when the emission of PCS overlaps with the absorption spectrum of the quencher, fluorescence quenching results from dipole-dipole energy transfer. In the absence of such overlap, fluorescence quenching occurs by a short-range mechanism or through the formation of donor-acceptor complexes. The quenching constants of PCS fluorescence by different quenchers were determined. Special effects were found for the migration of electronic excitation energy for conjugated blocks separated by saturated parts; there is, therefore an effect due to separation of conjugated blocks as found for other physical properties of PCS.