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Updated: Mar 27, 2026

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
Published on: August 16, 2018
Porous Organic Cages for Sulfur Hexafluoride Separation
Tom Hasell1, Marcin Miklitz2, Andrew Stephenson1
1Department of Chemistry and Centre for Materials Discovery, University of Liverpool , Crown St., Liverpool L69 7ZD, United Kingdom.
None:
A series of porous organic cages is examined for the selective adsorption of sulfur hexafluoride (SF6) over nitrogen. Despite lacking any metal sites, a porous cage, CC3, shows the highest SF6/N2 selectivity reported for any material at ambient temperature and pressure, which translates to real separations in a gas breakthrough column. The SF6 uptake of these materials is considerably higher than would be expected from the static pore structures. The location of SF6 within these materials is elucidated by X-ray crystallography, and it is shown that cooperative diffusion and structural rearrangements in these molecular crystals can rationalize their superior SF6/N2 selectivity.
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