Europium Luminescence Used for Logic Gate and Ions Sensing with Enoxacin As the Antenna

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• 作者：Lixia Lu ; Chuanxia Chen ; Dan Zhao ; Jian Sun ; Xiurong Yang
• 刊名：Analytical Chemistry
• 出版年：2016
• 出版时间：January 19, 2016
• 年：2016
• 卷：88
• 期：2
• 页码：1238-1245
• 全文大小：467K
• ISSN：1520-6882

文摘

Luminescent lanthanide ion complexes have received increasing attention because of their unique optical properties. Herein, we discovered that the luminescence of europium(III) (Eu³⁺) could be regulated by Ag⁺ and SCN^– in seconds with enoxacin (ENX) as the antenna. Under given conditions, only the simultaneous introduction of Ag⁺ and SCN^– could remarkably enhance the luminescence intensity of Eu³⁺-ENX complexes. This phenomenon has been exploited to design an “AND” logic gate and specific luminescence turn-on assays for sensitively sensing Ag⁺ and SCN^– for the first time. Furthermore, the addition of S^2– resulted in efficient luminescence quenching of the Eu³⁺/ENX/Ag⁺/SCN^– system due to the strong affinity between Ag⁺ and S^2–. Thus, a new luminescent sensing platform for S^2– was established, which exhibited excellent selectivity and high sensitivity. S^2– could be detected within the concentration range of 100 nM to 12.5 μM with a detection limit of 60 nM. Such sensing system features simplicity, rapidity, and flexibility. Moreover, this proposed Eu³⁺-based luminescent assay could be successfully applied in the real environmental water sample analysis.