期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 21, 期 2, 页码 907-914出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201405118
关键词
aggregation; aggregation-induced emission (AIE); luminescence; structure-activity relationships; synthesis design
资金
- National Basic Research Program of China (973 Program) [2013CB834701]
- Research Grants Council of Hong Kong [604711, 602212, HKUST2/CRF/10, N_HKUST620/11]
- Innovation and Technology Commission [ITCPD/17-9]
- University Grants Committee of Hong Kong [AoE/P-03108, T23-713/11-1]
- Guangdong Innovative Research Team Program [201101C0105067115]
A novel molecular design strategy is provided to rationally tune the stimuli response of luminescent materials with aggregation-induced emission (AIE) characteristics. A series of new AIE-active molecules (AIE rotors) are prepared by covalently linking different numbers of tetraphenylethene moieties together. Upon gradually increasing the number of rotatable phenyl rings, the sensitivity of the response of the AIE rotors to viscosity and temperature is significantly enhanced. Although the molecular size is further enlarged, the performance is only slightly improved due to slightly increased effective rotors, but with largely increased rotational barriers. Such molecular engineering and experimental results offer more in-depth insight into the AIE mechanism, namely, restriction of intramolecular rotations. Notably, through this rational design, the AIE rotor with the largest molecular size turns out to be the most viscosensitive luminogen with a viscosity factor of up to 0.98.
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