期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 12, 页码 2888-2897出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201704036
关键词
dyes/pigments; fluorescence; molecular rotors; sensors; viscosity
资金
- National Research Foundation of Korea (NRF) - Korean government [NRF-2014R1A5A1009799, 2009-0093826]
- Intramural Research Program of KIST
- National Research Foundation of Korea (NRF) by the Korean government (MSIP) [NRF-2016R1A2B4013003]
- GIST Research Institute (GRI)
- Korean Health Industry Development Institute [HI15C1540]
- Development of Platform Technology for Innovative Medical Measurements Program from the Korean Research Institute of Standards and Science [KRISS-2016-16011064]
- Korea Institute of Energy Technology Evaluation and Planning [20142020103790]
A series of fluorescent molecular rotors obtained by introducing two rotational groups (rotators), which exhibit different rotational and electron-donating abilities, are discussed. Whereas the control molecular rotor, PH, includes a single rotator (the widely used phenyl group), the PO molecular rotors consist of two rotators (a phenyl group and an alkoxy group), which exhibit simultaneous strongly electrond-onating and easy rotational abilities. Compared with the control rotor PH, PO molecular rotors exhibited one order of magnitude higher quantum yield (fluorescence intensity) and simultaneously exhibited significantly higher fluorescence contrast. These properties are directly related to the strong electron-donating ability and low energy barrier of rotation of the alkoxy group, as confirmed by dynamic fluorescence experiments and quantum chemical calculations. The PO molecular rotors exhibited two fluorescence relaxation pathways, whereas the PH molecular rotor exhibited a single fluorescence relaxation pathway. Cellular fluorescence imaging with PO molecular rotors for mapping cellular viscosity was successfully demonstrated.
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