Amide and N-oxide functionalization of T-shaped ligands for isoreticular MOFs with giant enhancements in CO 2 separation

By stepwise functionalization of a T-shaped ligand with amide and N-oxide groups, we obtained a MOF with drastically strengthened CO2-framework interactions, induced by a "open donor sites" (ODSs) effect, resulting in a high heat of adsorption and high CO2/CH4, CO2/CO and CO2/N2 separation selectivities at room temperature.