Ultrasonic Exfoliation of Hydrophobic and Hydrophilic Metal-Organic Frameworks To Form Nanosheets

Chemistry : a European Journal
David J AshworthJonathan A Foster

Abstract

The modular structure of metal-organic framework nanosheets (MONs) provides a convenient route to creating two-dimensional materials with readily tuneable surface properties. Here, the liquid exfoliation of two closely related layered metal-organic frameworks functionalised with either methoxy-propyl (1) or pentyl (2) pendent groups intended to bestow either hydrophilic or hydrophobic character to the resulting nanosheets is reported. Exfoliation of the two materials in a range of different solvents highlighted significant differences in their dispersion properties, as well as their molecular and nanoscopic structures. Exchange or loss of solvent was found to occur at the labile axial position of the paddle-wheel based MONs and DFT calculations indicated that intramolecular coordination by the oxygen of the methoxy-propyl pendant groups may take place. The nanoscopic dimensions of the MONs were further tuned by varying the exfoliation conditions and through "liquid cascade centrifugation". Aqueous suspensions of the nanosheets were used as sensors to detect aromatic heterocycles with clear differences in binding behaviour observed and quantified.

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Citations

Mar 13, 2020·Chemistry : a European Journal·Thanh-Hai LeHyeonseok Yoon
Jun 11, 2020·Chemical Communications : Chem Comm·Luis León-AlcaideEugenio Coronado
Nov 28, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Jian-Hua QinLu-Fang Ma
Jun 25, 2021·Chemical Science·Andreas SchneemannStefan Kaskel
Jul 3, 2019·Journal of the American Chemical Society·Anqi HuZhengzong Sun
Sep 1, 2021·Chemistry, an Asian Journal·Yuxiao LiDahuan Liu

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Methods Mentioned

BETA
NMR
AFM

Software Mentioned

Gaussian
Gwyddion
PerkinElmer Spectrum One
OpenEye
Elementar
G09
MICRO

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