A novel symmetrical imidazole-containing framework as a fluorescence sensor for selectively detecting silver ions?

Analyst Pub Date: 2021-11-09 DOI: 10.1039/D1AN01687C

Abstract

In this study, a novel and highly efficient “turn-off” fluorescence imidazole-based sensor (BIB) with a symmetric structure was synthesized by a four-step reaction, from o-phenylenediamine, 6-bromo-2-pyridinecarboxaldehyde, and 1-bromohexane. The sensing mechanism was confirmed via fluorescence titration, HRMS, and 1HNMR techiniques. The results showed that the binding ratio of BIB and Ag+ was 1?:?1 in a DMF-HEPES (pH 7.4) solution (9?:?1, v/v). The fluorescence response of BIB exhibited a good linear response within the Ag+ concentration ranging from 2 × 10?7 to 8 × 10?6 mol L?1, and the limit of detection was calculated to be 4.591 × 10?8 mol L?1. BIB was successfully applied to the detection of Ag+ in water samples with recoveries of 97.25–109.50% and relative standard deviations (RSD) of 1.14–2.45%. In addition, BIB can successfully be applied to qualitatively and quantitatively identify Ag+ in water by test paper strips of BIB, which is fast and convenient. This provides a possible potential for the rapid monitoring of metal ions by sensors in environmental research.

Graphical abstract: A novel symmetrical imidazole-containing framework as a fluorescence sensor for selectively detecting silver ions
Recommended Literature