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Preparation of dibenzimidazolium fluorescence probe based on binaphthol and the recognition for Al3+

Yingjie Liu, Linhai Hu, Qingxiang Liu

Abstract

A dibenzimidazolium salt based on binaphthol, 2,2'-bis[2’-(1-ethylbenzimidazole)ethoxy]-1,1’-binaphthol hexafluorophosphate (1) was synthesized. The recognition of compound 1 for Al3+ was studied by fluorescence spectra, ultraviolet spectra, 1H NMR, HRMS and IR spectra. The high K value (5.22 × 104 M-1) for 1•Al3+ indicated that 1 had strong binding force for Al3+. The low detection limit (4.31 × 10-7 mol/L) indicated that 1 was sensitive to the detection of Al3+. Compound 1 as a fluorescence probe can effectively distinguish Al3+ from other cations.

CH25034  Accepted 15 August 2025

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