Zn2+ detection of a benzimidazole 8-aminoquinoline fluorescent sensor by inhibited tautomerization?
RSC Advances Pub Date: 2021-11-11 DOI: 10.1039/D1RA05591G
Abstract
A new fluorescent chemosensor based on 8-aminoquinoline L1 bearing a benzimidazole moiety was synthesized, which exists as two predominant tautomers L1A and L1B in diluted DMSO-d6 solution. Among various metal ions, L1 showed a highly selective and sensitive turn-on fluorescence response to the presence of Zn2+ ions in methanol. The detection limit for Zn2+ by L1 was calculated to be 1.76 × 10?7 M. The 1?:?1 complexation ratio of the L1–Zn complex was confirmed through Job plot measurements. Complexation studies were performed by FT-IR, NMR and HR-ESI MS measurements and DFT calculations. With the gained insight, it was possible to successfully apply L1 in water sample analysis.
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Journal Name：RSC Advances
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CAS no.: 89640-58-4
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