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September 10, 2025

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

Key Points

The fluorescence probe shows a high binding affinity for Al3+, with a K value of 5.22 × 10^4 M−1.
A low detection limit of 4.31 × 10−7 mol L–1 demonstrates the probe's sensitivity for Al3+ detection.
Synthesis involves dibenzimidazolium salt based on binaphthol, enabling effective cation distinction.
Fluorescence spectra, NMR, and other techniques confirm the probe's efficiency and specificity for Al3+.

Abstract

A dibenzimidazolium salt based on binaphthol, 2,2′-bis2′-(1-ethylbenzimidazole)ethoxy-1,1′-binaphthol hexafluorophosphate (1) was synthesised. 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 a strong binding force for Al3+. The low detection limit (4.31 × 10−7 mol L–1) indicated that (1) was sensitive to the detection of Al3+. Compound (1), as a fluorescence probe, can effectively distinguish Al3+ from other cations.

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