Abstract
Exploration of porous adsorbents with high CO(2)/N(2) selectivity is of great significance for reducing CO(2) content in the atmosphere. In this study, a series of isoreticular ultramicroporous fluorinated metal-organic frameworks (MOFs) were prepared to explore the benefits of fluorinated ultramicropores in improving CO(2)/N(2) selectivity. Gas adsorption measurements revealed that the increase in the number of fluorine atoms in a ligand molecule leads to the increased CO(2) uptakes and CO(2)/N(2) selectivity. Theoretical calculations indicate that the interaction between the fluorine atoms and adsorbed CO(2) molecules enhances the CO(2)-philicity, offering useful insight into the improvement of CO(2)/N(2) selectivity in isoreticular frameworks.