Lastly, the -EN group, capable of readily accumulating electrons, can function as a nucleophilic site, selectively interacting with the electrophilic C atom within CO2 molecule. Due to the high electronegativity of fluorine, fluoride functional groups are frequently employed to design optimal pockets for selective CO2 capture within MOFs. A few MOFs incorporating fluoride functional groups have been experimentally validated to maintain their CO2 capture efficiency under humid conditions.