Controlling Gas Selectivity in Molecular Porous Liquids by Tuning the Cage Window Size

Control of pore window size is the standard approach for tuning gas selectivity in porous solids. Here, we present the first example where this is translated into a molecular porous liquid formed from organic cage molecules. Reduction of the cage window size by chemical synthesis switches the select...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2020-05, Vol.59 (19), p.7362-7366
Main Authors: Egleston, Benjamin D., Luzyanin, Konstantin V., Brand, Michael C., Clowes, Rob, Briggs, Michael E., Greenaway, Rebecca L., Cooper, Andrew I.
Format: Article
Language:English
Subjects:
adsorption selectivity
Cage molecules
Chemical synthesis
host-guest system
Magnetic resonance spectroscopy
NMR
NMR spectroscopy
Nuclear magnetic resonance
porous liquids
porous organic cages
Selectivity
Switches
Tuning
Xenon 129
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Summary:Control of pore window size is the standard approach for tuning gas selectivity in porous solids. Here, we present the first example where this is translated into a molecular porous liquid formed from organic cage molecules. Reduction of the cage window size by chemical synthesis switches the selectivity from Xe‐selective to CH4‐selective, which is understood using 129Xe, 1H, and pulsed‐field gradient NMR spectroscopy. Control of pore window size: Narrowing the windows of the organic cage used to form molecular porous liquids leads to tuning of the gas selectivity. Pulsed‐field gradient NMR spectroscopy is used to understand the selectivity.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201914037