期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 141, 期 7, 页码 3298-3303出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b13691
关键词
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资金
- National Natural Science Foundation of China [21522105, 51861145313]
- National Postdoctoral Program for Innovative Talents [BX201700272]
- ChEM [EM02161943]
Guest-dependent dynamics having both crystal contraction and expansion upon inclusion of various guests is uncovered in a 3D covalent organic framework (COF) prepared with a facile and scalable method. A molecular-level understanding of how the framework adjusts the node geometry and molecular configuration to perform significant contraction and large amplitude expansion are resolved through synchrotron in-house powder X-ray diffraction (PXRD) and Rietveld refinements. We found that the COF adopts a contracted phase at ambient conditions upon capturing moisture and is also adaptive upon inclusion of organic solvents, which is highlighted by a large crystal expansion (as large as 50% crystallographic volume increment and a 3-fold channel size enlargement). With this new knowledge of the structural adaptability, the diverse responses and coherent switchability are thereby presented to pave the way to rational design and deliberate control of dynamic COFs.
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