Journal
RSC ADVANCES
Volume 11, Issue 58, Pages 36450-36458Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra05591g
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A new fluorescent chemosensor based on 8-aminoquinoline L1 shows highly selective and sensitive turn-on fluorescence response to Zn2+ ions, with a detection limit of 1.76 x 10(-7) M. Various techniques were used to confirm the 1:1 complexation ratio of the L1-Zn complex and successfully apply L1 in water sample analysis.
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-d(6) 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 x 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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