期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 142, 期 28, 页码 12478-12485出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c05277
关键词
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资金
- National Natural Science Foundation of China [21971038, 21975044, 21805039, 21673039, 573042]
- Fujian Science and Technology Department [2019H6012, 2018J07001]
- China Postdoctoral Science Foundation [2018M642556]
- Welch Foundation [AX-1730]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
A microporous three-dimensional (3D) hydrogen-bonded organic framework (HOF-20) has been constructed from an aromatic-rich tetratopic carboxylic acid, 5-(2,6-bis(4-carboxyphenyl)pyridin-4-yl)isophthalic acid (H(4)BCPIA). The activated HOF-20a has a moderately high Brunauer-Emmett-Teller (BET) surface area of 1323 m(2) g(-1) and excellent stability in water and HCl aqueous solution. HOF-20 exhibits highly efficient turn-up fluorescent sensing of aniline in water with a detection limit of 2.24 mu M and is selective toward aniline in the presence of aromatic interferents, owing to the hydrogen bonding and edge-to-face p-p stacking interactions between the HOF-20 host and the guest aniline molecules, as demonstrated in the single-crystal X-ray structure of HOF-20.aniline. Density functional theory (DFT) calculations further demonstrate that the recognition of aniline molecules by HOF-20 could restrict the rotation of the aromatic rings in H4BCPIA linkers, reducing the nonradiative decay pathways upon photoexcitation and subsequently enhancing the fluorescence intensity.
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