An imidazole functionalized copper(II)-organic framework for highly selective sensing of picric acid and metal ions in water |
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Authors: | Xuelian Xin Jin Ai Fugang Li Jiaqi Zhao Liangliang Zhang |
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Institution: | 1. College of Public Health, Hebei University, 180 East Wusi Road, Baoding, Hebei, 071002 China;2. State Key Laboratory of Heavy Oil Processing & College of Science, China University of Petroleum (East China), 66 West Changjiang Road, Qingdao, Shandong, 266580 China;3. Frontiers Science Center for Flexible Electronics, Shaanxi Institute of Flexible Electronics & Shaanxi Institute of Biomedical Materials and Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, 710072 China |
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Abstract: | An imidazole functionalized metal–organic framework (MOF), Cu(HL)(H2O)]·(H2O)·(DMA) ( HBU-166 , H3L = 4,4′,4″-(1H-imidazole-2,4,5-triyl)tribenzoic acid, DMA = N,N-dimethylacetamide) was synthesized and characterized by single-crystal X-ray diffraction. HBU-166 was observed as a two-dimensional MOF and showed good stability in water, an acidic solution (pH = 4), and an alkaline solution (pH = 9). HBU-166 exhibited ligand-based luminescence with a blue shift, which could be attributed to the coordination effect. Moreover, HBU-166 could be applied to detect nitroaromatic compounds (NACs) and metal ions in water with preferable selectivity and sensitivity. In particular, HBU-166 could be used as a promising luminescent sensor for picric acid (PA) with enhancement of emission intensity. The mechanism for PA detection likely involved electron transfer and weak interaction between ligand and electron-deficient of NACs at the beginning to increase the emission intensity. Additionally, HBU-166 exhibited excellent selectivity in the sensing of 4-nitrophenol and Fe3+ through fluorescence quenching. |
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Keywords: | imidazole functionalized MOFs luminescent sensor PA detection stable MOFs |
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