Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 133, Issue 23, Pages 8900-8902Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja202154j
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Funding
- European Commission [PIEF-GA-2009-236665]
- Royal Society of Edinburgh
- Scottish Government
- Engineering and Physical Sciences Research Council [EP/D503744/1, EP/F008384/1] Funding Source: researchfish
- EPSRC [EP/F008384/1, EP/D503744/1] Funding Source: UKRI
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ZIF-8 is a zeolitic imidazole-based metal-organic framework with large cavities interconnected by narrow windows. Because the small size of the windows, it allows in principle for molecular sieving of gases such as H-2 and CH4. However, the unexpected adsorption of large molecules on ZIF-8 suggests the existence of structural flexibility. ZIF-8 flexibility is explored in this work combining different experimental techniques with molecular simulation. We show that the ZIF-8 structure is modified by gas adsorption uptake in the same way as it is at a very high pressure (i.e., 14 700 bar) due to a swing effect in the imidazolate linkers, giving access to the porosity. Tuning the flexibility, and so the opening of the small windows, has a further impact on the design of advanced molecular sieving membrane materials for gas separation, adjusting the access of fluids to the porous network.
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