A simple benzimidazole quinoline-conjugate fluorescent chemosensor for highly selective detection of Ag+
2016
Chen, Changjun | Liu, Haiyang | Zhang, Bin | Wang, Yanwei | Cai, Kai | Tan, Ying | Gao, Xuefen | Liu, Hongxia | Tan, Chunyan | Jiang, Yuyang
A novel and simple fluorescent chemosensor (L), N-((1H-benzo[d]imidazol-2-yl)methyl)quinoline-2-carboxamide, based on quinoline benzimidazole scaffold was synthesized successfully, which had a ‘turn-on’ effect for Ag+ detection in methanol/Tris buffer(1:1, v/v, pH=7.35) and exhibited a strong fluorescence emission at 357 nm (λex=300 nm). The chemosensor had high sensitivity and selectivity for Ag+ even in the presence of other metal ions with the detection limit of 4.4×10−7 M, which reached the standard of World Health Organization (WHO) for drinking water (5.0×10−7 M). The mechanism of the interaction between the sensor and Ag+ was investigated in detail through NMR and MALDI Mass spectra analysis.
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