Untwisted restacking of two-dimensional metal-organic framework nanosheets for highly selective isomer separations

Ze-Rong Tao, Jian-Xiang Wu, Ying-Jie Zhao, Ming Xu, Wen-Qi Tang, Qing-Hua Zhang, Lin Gu, Da-Huan Liu and Zhi-Yuan Gu ()
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Ze-Rong Tao: Nanjing Normal University
Jian-Xiang Wu: Nanjing Normal University
Ying-Jie Zhao: Beijing University of Chemical Technology
Ming Xu: Nanjing Normal University
Wen-Qi Tang: Nanjing Normal University
Qing-Hua Zhang: Chinese Academy of Sciences
Lin Gu: Chinese Academy of Sciences
Da-Huan Liu: Beijing University of Chemical Technology
Zhi-Yuan Gu: Nanjing Normal University

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract The stacking between nanosheets is an intriguing and inevitable phenomenon in the chemistry of nano-interfaces. Two-dimensional metal-organic framework nanosheets are an emerging type of nanosheets with ultrathin and porous features, which have high potential in separation applications. Here, the stacking between single-layer metal-organic framework nanosheets is revealed to show three representative conformations with tilted angles of 8°, 14°, and 30° for Zr-1, 3, 5-(4-carboxylphenyl)-benzene framework as an example. Efficient untwisted stacking strategy by simple heating is proposed. A detailed structural analysis of stacking modes reveals the creation of highly ordered sub-nanometer micropores in the interspacing of untwisted nano-layers, yielding a high-resolution separator for the pair of para-/meta-isomers over the twisted counterparts and commercial HP-5MS and VF-WAXMS columns. This general method is proven by additional nanosheet examples and supported by Grand Canonical Monte Carlo simulation. This finding will provide a synthetic route in the rational design of functionalities in two-dimensional metal-organic framework nanosheet.

Date: 2019
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DOI: 10.1038/s41467-019-10971-x

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