期刊
DALTON TRANSACTIONS
卷 47, 期 10, 页码 3452-3458出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8dt00088c
关键词
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资金
- 973 Program [2014CB845605]
- NSFC [21671188, 21521061, 21331006]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
- Youth Innovation Promotion Association, CAS [2014265]
- China Scholarship Council [201704910486]
- Key Research Program of Frontier Science, CAS [QYZDJ-SSW-SLH045]
Fast and highly selective detection of trace amounts of metal ions has become one of the most urgent issues concerning public security and living systems. However, developing a highly efficient fluorescent sensor for metal ions still remains a great challenge. Metal-organic frameworks (MOFs) are a promising class of porous fluorescent sensors towards ion detection. Herein, the anionic MOF FJI-C8 based on the p-conjugated aromatic ligand H(6)TDPAT (2,4,6-tris(3,5-dicarboxylphenylamino)-1,3,5-triazine) containing uncoordinated nitrogen and carboxylate oxygen atoms was chosen as highly efficient sensor for selective detection of Fe3+. Due to the strong interaction between Fe3+ and Lewis base sites (uncoordinated nitrogen and carboxylate oxygen atoms), the high overlap between the emission spectrum of the anionic FJI-C8 and the absorption spectrum of Fe3+, and the good overlap of the excitation spectrum of the host material FJI-C8 with the absorption spectrum of Fe3+, FJI-C8 exhibited a high sensitivity (0.0233 mM of Fe3+) and extra selectivity (K-sv = 8245 M-1) for the rapid detection (less than 30 s) of Fe3+ with low usage (0.04 mg mL(-1) of FJI-C8 suspension). To the best of our knowledge, this is the first example of a luminescent MOF chemosensor based on a trefoil ligand with the highest density of uncoordinated N and carboxylate O atoms for the highly selective detection of Fe3+. It is also crucial to note that this is a first time detection of Fe3+ using both FJI-C8 suspension and solid after filtration, and the results indicate that the detection of Fe3+ using the FJI-C8 suspension is better. This study will pave the way for designing luminescent MOF chemosensors for the detection of Fe3+ ion.
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