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Design and Synthesis of Fluorescence “Turn-on” Chemosensors based on Photoinduced Electron Transfer in Conjugated Polymers
來源:范麗娟教授個人網(wǎng)站 發(fā)布日期:2010-12-07
作者:Li-Juan Fan, Yan Zhang, and Wayne E. Jones, Jr.
關(guān)鍵字:“Turn-on” Chemosensors , Photoinduced Electron Transfer , Conjugated Polymer
論文來源:期刊
具體來源:Macromolecules
發(fā)表時間:2005年

A new approach to fluorescence “turn-on” chemosensors based on a photoinduced electron transfer (PET) strategy involving conjugated polymers has been developed. Two new conjugated polymers dea-PPETE and tmeda-PPETE were synthesized and characterized. These two polymers use diethylamino and N,N,N‘-trimethylethylenediamino as receptors, respectively, on a poly[p-(phenyleneethylene)-alt-(thienyleneethynylene)] (PPETE) fluorescent conjugated polymer backbone. The polymers were found to be relatively weakly emissive at λmax  488 nm with quantum yields of 0.11 and 0.09, respectively, at room temperature in THF solution. Initial investigations show that the tmeda-PPETE selectively detects some metal cations by an observed increase in fluoresence. In particular, Hg2+ in aqueous solution causes the fluorescence of tmeda-PPETE to increase by a factor of 2.7 at less than micromolar concentrations. The photophysical results are consistent with a PET mechanism for fluorescence quenching, which is removed upon binding of the analyte.

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