期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 49, 页码 16046-16050出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201808861
关键词
acids; donor-acceptor molecules; room temperature phosphorescence; thioethers
资金
- National Key R&D Program of China [2017YFA0303500]
- Fundamental Research Funds for the Central Universities [WK2340000068]
- General Financial Grant from China Postdoctoral Science Foundation [2016M602029]
- Anhui Provincial Natural Science Foundation [1708085MB38]
Room-temperature phosphorescence (RTP)-based sensors have distinctive advantages over the fluorescence counterparts, such as larger Stokes shifts and longer lifetimes. Unfortunately, almost all RTP sensors are operated on quenching-based mechanisms given the sensitive nature of the emissive triplet state. Here we report a type of thioether RTP molecules that shows RTP turn-on when volatile acid vapors such as HCl are in contact. To elucidate the underlying mechanism, model thioethers containing different donor/acceptor combinations are investigated via fluorescence spectroscopy and theoretical calculations aided by molecular coordinates obtained from single-crystal X-ray diffraction. It is revealed that a charge-transfer character in the phosphorescence state is crucial. The turn-on design concept may significantly broaden the sensing application scope for organic RTP molecules.
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