Dynamic Pendulum Effect of an Exceptionally Flexible Pillared‐Layer Metal‐Organic Framework

Main observation and conclusion Magnifying the controllable directional motions of molecular machines to the macroscopic levels is a significant topic for chemists. Flexible metal–organic frameworks with long‐range order and responsive structural transformation under external stimuli may be an appro...

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Bibliographic Details
Published in:Chinese journal of chemistry 2021-10, Vol.39 (10), p.2718-2724
Main Authors: Zhou, Hao‐Long, Bai, Jie, Tian, Xiao‐Yun, Mo, Zong‐Wen, Chen, Xiao‐Ming
Format: Article
Language:English
Subjects:
Adsorption
Chemists
Crystal structure
Crystals
External stimuli
Inversions
Metal-organic frameworks
Molecular machines
Porous coordination polymers
Smart materials
Stability
Structural transformation
X-ray diffraction
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Summary:Main observation and conclusion Magnifying the controllable directional motions of molecular machines to the macroscopic levels is a significant topic for chemists. Flexible metal–organic frameworks with long‐range order and responsive structural transformation under external stimuli may be an appropriate platform for achieving the target. By taking advantage of the single‐crystal to single‐crystal manner of soft porous crystals, we utilize single‐crystal X‐ray diffraction to directly observe the dynamic structural inversion of a new three‐fold interpenetrated pillared‐layer metal‐organic framework [Co(edba)(bpy)] (MCF‐83, H2edba = 4,4’‐(ethyne‐1,2‐diyl)dibenzoic acid, bpy = 4,4’‐bipyridine). More interestingly, the dynamic inversions of the pillars and layers are selectively guest‐controllable and independent, allowing precise control of the directional shape changes, which is the key of constructing intelligent materials to accomplish a complex task. The mechanism is further studied by combining the X‐ray diffraction analyses, sorption measurements and molecular simulations. By taking advantage of the single‐crystal to single‐crystal manner of soft porous crystals, we utilize X‐ray diffraction to directly observe the dynamic structural inversion of a new three‐fold interpenetrated pillared‐layer metal‐organic framework. The dynamic inversions of the pillars and layers are selectively guest‐controllable and independent, and the mechanism is studied by combining the X‐ray diffraction analyses, sorption measurements and molecular simulations.
ISSN:1001-604X
1614-7065
DOI:10.1002/cjoc.202100263