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A novel host−guest recognition motif based on a water‐soluble pillar[7]arene (WP7) and a 2,7‐diazapyrenium salt (DMDAP) was prepared. According to the integrated results of 1H NMR, 2D NOESY, UV–vis spectroscopy and fluorescence titration experiments, we demonstrated that the molecular recognition of WP7 to DMDAP in water not only has high association constant but also has pH‐responsiveness. Subsequently,...
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