Macromolecules, Vol.30, No.10, 2934-2940, 1997
Effect of Coil Collapse on Photon-Harvesting Polymers with Phenanthrene Chromophores
Fluorescence measurements were used to explore the effect of solvent-induced polymer coil collapse on electronic energy transport for both methacrylate and methacrylic acid copolymers with pendant phenanthrene chromophores. Changes in the quantum yield and efficiency of excitation transport show that the efficiency of electronic energy transport to a covalently bound anthracene trap increases with coil contraction, although this increase is part of a complex chain of events in which phenanthrene-phenanthrene self-quenching plays an important role even though classical excimer formation is negligible. Room temperature solution and 77 K matrices display qualitatively similar behavior. Measurements for polymethacrylic acid-co/alt-poly(vinylphenanthrene) polymers in aqueous solution at room temperature and at 77 K illustrate analogous behavior as a function of pH.
Keywords:ELECTRONIC-ENERGY TRANSFER;EFFICIENT NUMERICAL-SIMULATION;SHORT-RANGE TRANSFER;TIME-DEPENDENCE;ACID;COPOLYMERS;SINGLET