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Two novel imide/imine‐based organic cages have been prepared and studied as materials for the selective separation of CO2 from N2 and CH4 under vacuum swing adsorption conditions. Gas adsorption on the new compounds showed selectivity for CO2 over N2 and CH4. The cages were also tested as fillers in mixed‐matrix membranes for gas separation. Dense and robust membranes were obtained by loading the cages in either Matrimid® or PEEK‐WC polymers. Improved gas‐transport properties and selectivity for CO2 were achieved compared to the neat polymer membranes. [ABSTRACT FROM AUTHOR]

Cover Feature: Gas Permeation through Mechanically Resistant Self-Standing Membranes of a Neat Amorphous Organic Cage (Chem. Eur. J. 56/2023) Keywords: gas transport; membranes; molecular materials; organic cages; thin films EN gas transport membranes molecular materials organic cages thin films 1 1 1 10/12/23 20231009 NES 231009 B Gas separation b : A novel organic cage with excellent film-forming tendencies was processed into transparent, mechanically robust, self-standing membranes of controllable thickness. Gas transport, membranes, molecular materials, organic cages, thin films. [Extracted from the article]