Lee, Seung-Chul Lee, Chang-Lyoul Heo, Jeongyun Jeong, Chan-Uk Lee, Gyeong-Hui Kim, Sehoon Yoon, Woojin Yun, Hoseop Park, Sung O. Kwak, Sang Kyu Park, Sung-Ha Kwon, O-Pil 2024-01-19T23:30:57Z 2024-01-19T23:30:57Z 2021-09-03 2018-02-26 0947-6539 https://pubs.kist.re.kr/handle/201004/121691 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. English WILEY-V C H VERLAG GMBH CONFIGURATIONALLY LOCKED POLYENE INTRAMOLECULAR CHARGE-TRANSFER AGGREGATION-INDUCED EMISSION LIVING CELLS LIVE CELLS ROTORS CRYSTALS ENVIRONMENTS DERIVATIVES PROBES Molecular Viscosity Sensors with Two Rotators for Optimizing the Fluorescence Intensity-Contrast Trade-Off Article 10.1002/chem.201704036 1 CHEMISTRY-A EUROPEAN JOURNAL, v.24, no.12, pp.2888 - 2897 CHEMISTRY-A EUROPEAN JOURNAL 24 12 2888 2897 scie scopus 000429415200016 2-s2.0-85037649197 Chemistry, Multidisciplinary Chemistry Article CONFIGURATIONALLY LOCKED POLYENE INTRAMOLECULAR CHARGE-TRANSFER AGGREGATION-INDUCED EMISSION LIVING CELLS LIVE CELLS ROTORS CRYSTALS ENVIRONMENTS DERIVATIVES PROBES dyes/pigments fluorescence molecular rotors sensors viscosity