Two Ln-MOFs Based on 4,4',4''-nitrilotrisbenzoic Acid as Multi-Response Luminescence Sensors With High Selectivity
Jing Wang1, Danyang Qi1, Caiyun Shao1
1Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Molecular Sciences, Henan University, Kaifeng, Henan, 475004, China.
Abstract:
Lanthanide metal-organic frameworks (Ln-MOFs) have been widely developed for sensing due to their inherent structural properties and unique lanthanide luminescence characteristics. Herein, a series of Ln-MOFs (Ln = Nd (1), Eu (2), Gd (3), Tb (4), Ho (5)) were successfully synthesized using the ligand 4,4',4''-nitrilotrisbenzoic acid (H3NTB) under hydrothermal conditions. The fluorescence experiments demonstrate that compounds 2 and 4 can specifically recognize Fe3+ and Cr2O7 2- ions in aqueous solutions through significant fluorescence quenching, respectively. This process not only exhibits high selectivity for the target ions but also shows a low detection limit, excellent anti-interference capability, and relatively fast response time (less than 45 s). The distinct emission changes of 2/4 enable multifunctional, rapid, convenient, and visible detection by the naked eye under 365 nm UV light. Finally, the potential sensing mechanisms were elucidated based on experimental evaluation in detail.
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