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

作者：Ze-Rong Tao, Jianxiang Wu, Yingjie Zhao, Ming Xu, Wen‐Qi Tang, Qinghua Zhang, Lin Gu, Dahuan Liu, Zhi‐Yuan Gu · 发表于：Nature Communications · 年份：2019 · DOI：10.1038/s41467-019-10971-x · 被引用次数：158 · 研究领域：Metal-Organic Frameworks: Synthesis and Applications、Covalent Organic Framework Applications、Membrane Separation and Gas Transport

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.