Abstract
Boron trifluoride (BF3) is extensively used in multiple industrial fields including semiconductor, battery and chemical industries. However, BF3 is also an extremely poisonous and caustic substance causing potential risk to environmental safety and human health. In this work, a novel ratiometric fluorescent probe (TBS) for sensing BF3 was designed and synthesized based on the natural phenanthraquinone tanshinone IIA. TBS exhibited a significant ratiometric fluorescence response toward BF3 with low detection limit (98 nM), short response time (1 min), prominent selectivity, anti-interference ability and reversibility. In addition, the sensing mechanism of TBS was investigated through 1H NMR titration, HRMS and DFT study. Furthermore, TBS was successfully utilized in quantitatively detecting BF3 concentrations of the commercially available BF3 reagent solutions as well as visually tracking gaseous BF3 through the TBS-loaded paper test strips.
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