期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 25, 页码 10087-10094出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201912594
关键词
covalent organic frameworks; fluorescence; imaging agents; materials science; pi-pi stacking
资金
- National Natural Science Foundation of China [51903191, 51833007, 21721005, 51690152]
- China Postdoctoral Science Foundation [2019TQ234, 2019M652693]
Fluorescent materials exhibiting two-photon induction (TPI) are used for nonlinear optics, bioimaging, and phototherapy. Polymerizations of molecular chromophores to form pi-conjugated structures were hindered by the lack of long-range ordering in the structure and strong pi-pi stacking between the chromophores. Reported here is the rational design of a benzothiadiazole-based covalent organic framework (COF) for promoting TPI and obtaining efficient two-photon induced fluorescence emissions. Characterization and spectroscopic data revealed that the enhancement in TPI performance is attributed to the donor-pi-acceptor-pi-donor configuration and regular intervals of the chromophores, the large pi-conjugation domain, and the long-range order of COF crystals. The crystalline structure of TPI-COF attenuates the pi-pi stacking interactions between the layers, and overcomes aggregation-caused emission quenching of the chromophores for improving near-infrared two-photon induced fluorescence imaging.
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