The efficient and selective detection of isomers is an attractive but challenging area. In this study, a supramolecular fluorescent probe based on cucurbituril (Q) and a pyrene-based derivative (G) was prepared, which effectively recognized and removed o-nitrophenol (o-NP) from a mixture of nitrophenol isomers. The newly designed probe G@Q was characterized by NMR spectroscopy, fluorescence emission and UV-Vis spectroscopy, and its host-guest properties in aqueous solution were investigated. The results revealed that the system forms a stable inclusion complex with a stoichiometric ratio of 1:1, which was accompanied by a distinct fluorescence enhancement of G. Moreover, it was employed for the rapid detection of nitrophenol isomers where o-NP showed a dramatical quenching efficiency with a detection limit of 1.53 × 10-7 mol·L-1. This highly efficient supramolecular fluorescent probe offers a new strategy for the convenient detection and removal of o-NP from mixtures in aqueous medium.
Keywords: Fluorescent probe; Host-guest interaction; Nitrophenol isomers; Pyrene; cucurbit[n]urils.
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