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Issue 4, 2017
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Understanding gas capacity, guest selectivity, and diffusion in porous liquids

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Abstract

Porous liquids are a new class of material that could have applications in areas such as gas separation and homogeneous catalysis. Here we use a combination of measurement techniques, molecular simulations, and control experiments to advance the quantitative understanding of these liquids. In particular, we show that the cage cavities remain unoccupied in the absence of a suitable guest, and that the liquids can adsorb large quantities of gas, with gas occupancy in the cages as high as 72% and 74% for Xe and SF6, respectively. Gases can be reversibly loaded and released by using non-chemical triggers such as sonication, suggesting potential for gas separation schemes. Diffusion NMR experiments show that gases are in dynamic equilibrium between a bound and unbound state in the cage cavities, in agreement with recent simulations for related porous liquids. Comparison with gas adsorption in porous organic cage solids suggests that porous liquids have similar gas binding affinities, and that the physical properties of the cage molecule are translated into the liquid state. By contrast, some physical properties are different: for example, solid homochiral porous cages show enantioselectivity for chiral aromatic alcohols, whereas the equivalent homochiral porous liquids do not. This can be attributed to a loss of supramolecular organisation in the isotropic porous liquid.

Graphical abstract: Understanding gas capacity, guest selectivity, and diffusion in porous liquids

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Publication details

The article was received on 25 Nov 2016, accepted on 12 Jan 2017 and first published on 31 Jan 2017


Article type: Edge Article
DOI: 10.1039/C6SC05196K
Citation: Chem. Sci., 2017,8, 2640-2651
  • Open access: Creative Commons BY license
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    Understanding gas capacity, guest selectivity, and diffusion in porous liquids

    R. L. Greenaway, D. Holden, E. G. B. Eden, A. Stephenson, C. W. Yong, M. J. Bennison, T. Hasell, M. E. Briggs, S. L. James and A. I. Cooper, Chem. Sci., 2017, 8, 2640
    DOI: 10.1039/C6SC05196K

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