Polymer and Materials Science
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
The fluorescence behavior of the 4-phenoxymethylstilbene chromophore in the free state and when bound to a polymer backbone was studied using the model compound 4-(4-ethylphenoxymethyl)stilbene, the homopolymer poly[4-(4-stilbenylmethoxy)styrene] and two random copolymers of styrene and 4-(4-stilbenylmethoxy)styrene in which the styrene/chromophore mole ratios were 1/1 and 2/1, respectively. A strong dependence on concentration and excitation wavelength was observed for the fluorescence behavior of the free and bound chromophores, both in solution and in the solid state. The overall results lead to a proposed mechanism for the emission in which the chromophore forms a fluorescent dimer in the ground state. By studying the effect of solvent power variations it was concluded also that the association is intramacromolecular and occurs between nearest and/or non-nearest neighbors in the chain. The excitation spectra are consistent with these assumptions, and the corresponding electroluminescence spectra show that the associated chromophores are the active species.
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