期刊
NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-021-24187-5
关键词
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资金
- NSFC/China [21788102, 21636002, 21622602, 21908060]
- National Key Research and Development Program [2017YFC0906902, 2016YFA0200300]
- Shanghai Municipal Science and Technology Major Project [2018SHZDZX03]
- Innovation Program of Shanghai Municipal Education Commission, Scientific Committee of Shanghai [15XD1501400]
- Programme of Introducing Talents of Discipline to Universities [B16017]
- Shuguang Program [18SG27]
- China Postdoctoral Science Foundation [2019M651417]
- A*STAR [A2083c0051]
This study presents a simple and generalizable strategy to reverse the electron-withdrawing target (EWT)-induced quenching mode in intramolecular charge transfer (ICT) fluorophores into a light-up mode by introducing an indazole building block into the ICT scaffold.
Intramolecular charge transfer (ICT) is a fundamental mechanism that enables the development of numerous fluorophores and probes for bioimaging and sensing. However, the electron-withdrawing targets (EWTs)-induced fluorescence quenching is a long-standing and unsolved issue in ICT fluorophores, and significantly limits the widespread applicability. Here we report a simple and generalizable structural-modification for completely overturning the intramolecular rotation driving energy, and thus fully reversing the ICT fluorophores' quenching mode into light-up mode. Specifically, the insertion of an indazole unit into ICT scaffold can fully amplify the intramolecular rotation in donor-indazole--acceptor fluorophores (fluorescence OFF), whereas efficiently suppressing the rotation in their EWT-substituted system (fluorescence ON). This molecular strategy is generalizable, yielding a palette of chromophores with fluorescence umpolung that spans visible and near-infrared range. This strategy expands the bio-analytical toolboxes and allows exploiting ICT fluorophores for light-up sensing of EWTs including N-acetyltransferases and nerve agents. The electron-withdrawing target (EWT)-induced fluorescence quenching is an unsolved issue in intramolecular charge transfer (ICT) fluorophores that limits their applicability. Here, the authors report a simple and generalizable strategy to reverse the EWT-induced quenching mode into light-up mode, by introducing an indazole building block between the pi -bridge and the donor in the ICT scaffold.
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