Nanocage-Based N-Rich Metal–Organic Framework for Luminescence Sensing toward Fe3+ and Cu2+ Ions
| Autor: | Dacheng Li, Dafei Sheng, Huiyan Ma, Zhi-Yong Gao, Shan-Shan Zhang, Hui Yan, Jing Li, Yun-Wu Li, Xiaoyu Wan, Suna Wang, Di Sun, Jianmin Dou |
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| Rok vydání: | 2021 |
| Předmět: |
Quenching (fluorescence)
010405 organic chemistry Chemistry Metal ions in aqueous solution 010402 general chemistry Photochemistry 01 natural sciences 0104 chemical sciences Ion Inorganic Chemistry Nanocages Metal-organic framework Density functional theory Physical and Theoretical Chemistry Absorption (chemistry) Luminescence |
| Zdroj: | Inorganic Chemistry. 60:671-681 |
| ISSN: | 1520-510X 0020-1669 |
| Popis: | Luminescent metal-organic frameworks (LMOFs) as sensors showing highly efficient detection toward toxic heavy-metal ions are in high demand for human health and environmental protection. A novel nanocage-based N-rich LMOF (LCU-103) has been constructed and characterized. It is a 2-fold interpenetrating structure built from N-rich {Zn6(dttz)4} nanocages extended by N-donor ligand Hdpa [H3dttz = 4,5-di(1H-tetrazol-5-yl)-2H-1,2,3-triazole; Hdpa = 4,4'-dipyridylamine]. Notably, LCU-103 contains abundant N functional sites anchoring on both the windows of nanocages and the inner channels of the framework that can interact with metal ions and then recognize them. As a result, it can serve as a luminescent sensing material for detecting trace amounts of Fe3+ and Cu2+ ions with low limits of detection (LODs) of 1.45 and 1.66 μM, respectively, through a luminescent quenching mechanism. Meanwhile, LCU-103 as a LMOF sensor exhibits several advantages such as high sensitivity, appropriate selectivity (for Fe3+ in H2O), recycling stability, and fast response times in N,N-dimethylformamide. Moreover, LCU-103 also displays good luminescent quenching activity toward Fe3+ in H2O and a simulated 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid biological system with low LODs of 1.51 and 1.52 μM, respectively. LCU-103 test papers were further prepared to offer easy and real-time detection of Fe3+ and Cu2+ ions. Importantly, when density functional theory calculations and multiple experimental evidence, including X-ray photoelectron spectroscopy, UV-vis absorption, luminescence decay lifetimes, and quantum efficiencies, are combined, a preferred N-donor site and possible weak interaction sensing mechanism is also proposed to elucidate the quenching effect. |
| Databáze: | OpenAIRE |
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