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The design and preparation of novel multifunctional lanthanide metal-organic frameworks (Ln-MOFs) have been arisen widespread attention. In particular, Ln-MOFs have shown great luminescence potential in chemical sensing. Herein, a new benzothiadiazole-based Eu-MOF {[(CH)NH][Eu(BTDB)]·2HO} () was obtained based on 4,4'-(benzo[][1,2,5]thiadiazole-4,7-diyl)dibenzoic acid (HBTDB), which exhibits a chain-based three-dimensional framework. Moreover, is considered as a photoluminescent sensor to identify Al and Ga ions by fluorescence enhancement with the detection limits of 2.9 and 10.2 ppm, severally. Importantly, Al and Ga can be discerned with the naked eye by color change under a natural lamp. In addition, a portable MOF film based on was developed for Al and Ga detection. This is the first Ln-MOF that can be employed as a naked-eye fluorescent probe to identify Ga. Interestingly, is also capable of detecting Al and Ga in living cells.
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