Pyrene-appended, benzimidazoliums-urea-based ratiometric fluorescent chemosensor for highly selective detecting of H2PO4−

[摘要] A novel flexible pyrene-based chemosensor 1 bearing two benzimidazolium moieties and a urea group was designed and synthesized. The binding properties of chemosensor 1 toward various anions were examined via UV-vis, fluorescence, and 1H NMR spectroscopic methods. The results demonstrated that chemosensor 1 could distinguish H2PO4− from other tested anions such as F−, Cl−, Br−, I−, AcO− and HSO4− by ratiometric fluorescence as chemosensor 1 formed a complex with H2PO4− in 2:2 ratio via intermolecular excimer transduction in CH3CN. The fluorescence response of chemosensor 1 to H2PO4− was hardly interfered by other anions. The detection limit of chemosensor 1 (5 × 10−6 M) toward H2PO4− is 5.02 × 10−7 M.

[学科分类] 分析化学