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Strong electron-deficient heterocycles of acetyl Fipronil (F3) was designed and synthesized, its ability for anion recognition was investigated by UV and NMR analyses. This novel Fipronil-based receptor F3 shows strong binding affinity with acetate (⩾10 7 M −1 ), phosphate or fluoride ion through efficient deprotonation. In addition, its interaction with chloride anion or other weak...
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