Modified rhodamine 6G molecules (Rh|Al)with polymerizable double bonds were copolymerized with methyl methacrylate(MMA) and 1,8|naphthalimide derivative(N|AE).The structures of the two monomers(Rh|Al and N|AE)were confirmed and characterized by 1H|NMR and MS. The UV|Vis absorption spectra of the copolymer indicate that there is little or no interaction between the two chromophores in their ground state. However, the fluorescence emission of N|AE was partly quenched and the fluorescence emission of Rh|Al was enhanced in the copolymer. While the fluorescence emissions of N|AE and Rh|Al both were partly quenched in the corresponding mixture. The results show that in the excited state there exists very effective intramolecular singlet|singlet energy transfer(Intra|SSET)channel from N|AE to Rh|Al in the copolymer. The experiments seem to indicate that the covalent binding of the chromophore to a polymer chain restricts its mobility and,therefore, hinders the internal micromotions of the excited groups, avoiding non|fluorescent deactivation and thus increasing its emission efficiency and photostability.
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