Volume 131, Issue 34 pp. 11883-11888
Zuschrift

Lock-and-Key and Shape-Memory Effects in an Unconventional Synthetic Path to Magnesium Metal–Organic Frameworks

Dr. Huajun Yang

Dr. Huajun Yang

Department of Chemistry and Biochemistry, California State University, Long Beach, CA, 90840 USA

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Thuong Xinh Trieu

Thuong Xinh Trieu

Department of Chemistry and Biochemistry, California State University, Long Beach, CA, 90840 USA

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Dr. Xiang Zhao

Dr. Xiang Zhao

Department of Chemistry, University of California, Riverside, CA, 92521 USA

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Yanxiang Wang

Yanxiang Wang

Department of Chemistry, University of California, Riverside, CA, 92521 USA

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Dr. Yong Wang

Dr. Yong Wang

Department of Chemistry, University of California, Riverside, CA, 92521 USA

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Prof. Pingyun Feng

Corresponding Author

Prof. Pingyun Feng

Department of Chemistry, University of California, Riverside, CA, 92521 USA

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Prof. Xianhui Bu

Corresponding Author

Prof. Xianhui Bu

Department of Chemistry and Biochemistry, California State University, Long Beach, CA, 90840 USA

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First published: 15 July 2019
Citations: 12

Abstract

We report a new magnesium metal–organic framework (MOF) (CPM-107) with a special interaction with CO2. CPM-107 contains Mg2-acetate chains crosslinked into a 3D net by terephthalate. It has an anionic framework encapsulating ordered extra-framework cations and solvent molecules. The desolvated form is closed and unresponsive to common gasses, such as N2, H2, and CH4. Yet, with CO2 at 195 K, it abruptly opens and turns into a rigid porous form that is irreversible via desorption. Once opened by CO2, CPM-107 remains in the stable porous state accessible to additional gas types over multiple cycles or CO2 itself at different temperatures. The porous phase can be re-locked to return to the initial closed phase via re-solvation and desolvation. Such peculiar properties of CPM-107 are apparently linked to a convergence of factors related to both framework and extra-framework features. The unusual CO2 effect is currently the only available path to porous CPM-107 which shows efficient C2H2/CO2 separation.

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