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)wer...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.展开更多
文摘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.
