Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 20, Issue 13, Pages 2175-2180Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.200902155
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Funding
- National Natural Science Foundation of China [20725308, 20721061, TRR61]
- National Basic Research Program of China [2006CB806200]
- Major Research Plan of China [2006CB932100]
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A new water-soluble zwitterionic oligofluorene bearing carboxylic acid and quaternary ammonium as pendant groups (OF-1) is synthesized and characterized. It forms aggregates by intermolecular electrostatic interactions and exhibits similar light-harvesting ability as that of conjugated polymers. Efficient fluorescence resonance energy transfer (FRET) occurs from OF-1 to double-stranded DNA tagged with fluorescein (dsDNA-F1). A photoresponsive oligofluorene (OF-3) is also synthesized by protecting OF-1 with 1-(2-nitrophenyl)ethanol. Photolysis of OF-3 can produce OF-1 to result in a fluorescence turn-on response, thus the FRET from OF-3 to dsDNA-F1 can be turned on by light irradiation. OF-3 offers the potential for remote DNA sensing.
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