Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-10818-5
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Funding
- National Science Foundation of China [51622305, 21788102]
- Innovation and Technology Commission [ITC-CNERC14SC01, ITS/254/17]
- Research Grants Council of Hong Kong [16305015, 16308016, A-HKUST605/16, C2014-15G, C6009-17G]
- PCSIRT [IRT13023]
- Shenzhen Science and Technology Program [JCYJ20160229205601482, JCYJ20160509170535223]
- UGC Special Equipment Grant [SEG-HKU-07]
- University of Hong Kong Development Fund 2013-2014 project New Ultrafast Spectroscopy Experiments for Shared Facilities
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Aggregation-induced emission (AIE) is a photophysical phenomenon correlated closely with the excited-state intramolecular motions. Although AIE has attracted increasing attention due to the significant applications in biomedical and optoelectronics, an in-depth understanding of the excited-state intramolecular motion has yet to be fully developed. Here we found the non-aromatic annulene derivative of cyclooctatetrathiophene shows typical AIE phenomenon in spite of its rotor-free structure. The underlying mechanism is investigated through photoluminescence spectra, time-resolved absorption spectra, theoretical calculations, circular dichroism as well as by pressure-dependent fluorescent spectra etc., which indicate that the aromaticity reversal from ground state to the excited state serves as a driving force for inducing the excited-state intramolecular vibration, leading to the AIE phenomenon. Therefore, aromaticity reversal is demonstrated as a reliable strategy to develop vibrational AIE systems. This work also provides a new viewpoint to understand the excited-state intramolecular motion behavior of lumiongens.
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