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 S2– resulted in efficient luminescence quenching of the Eu3+/ENX/Ag+/SCN– system due to the strong affinity between Ag+ and S2–. Thus, a new luminescent sensing platform for S2– was established, which exhibited excellent selectivity and high sensitivity. S2– 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.