Fluorine containing 1-butyl 3-methylimidazolium ([BMIM] + ) ILs (i.e., [BMIM] + with counter ions such as [BF4] -and [PF6] -anions) exhibited high adsorption of CO2 (Figure ) . (Figure ) . This could be also due to the high dispersion of fluorine-containing anions on the ZIF-8 surface compared to the non-fluorinated anion . The incorporation of ILs in ZIFs materials enhances the adsorption and selectivity of CO2 . a b Figure a) structure of the ionic liquid, and b) gas-phase optimized geometries of CO2@ILs, with shortest interaction distances (in Å). Figure reprinted with permission from Ref. . Copyrigt belongs to Elsevier.