Nanocage-Based N-Rich Metal–Organic Framework for Luminescence Sensing toward Fe 3+ and Cu 2+ Ions

作者：Yun‐Wu Li, Jing Li, Xiaoyu Wan, Dafei Sheng, Hui Yan, Shan‐Shan Zhang, Huiyan Ma, Suna Wang, Dacheng Li, Zhiyong Gao, Jianmin Dou, Di Sun · 发表于：Inorganic Chemistry · 年份：2021 · DOI：10.1021/acs.inorgchem.0c02629 · 被引用次数：145 · 研究领域：Metal-Organic Frameworks: Synthesis and Applications、Molecular Sensors and Ion Detection、Covalent Organic Framework Applications

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 {Zn 6 (dttz) 4 } nanocages extended by N-donor ligand Hdpa [H 3 dttz = 4,5-di(1 H -tetrazol-5-yl)-2 H -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 Fe 3+ and Cu 2+ 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 Fe 3+ in H 2 O), recycling stability, and fast response times in N, N -dimethylformamide. Moreover, LCU-103 also displays good luminescent quenching activity toward Fe 3+ in H 2 O 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 Fe 3+ and Cu 2+ ions. Importantly, when density functional theory calculations a...