Significant enhancement of gas uptake capacity and selectivity via the judicious increase of open metal sites and Lewis basic sites within two polyhedron-based metal-organic frameworks

Two new isomorphous polyhedron-based MOFs (JLU-Liu20 and JLU-Liu21), with dual functionalities of OMSs and LBSs, have been synthesized by using the SBB strategy. By judiciously avoiding the DABCO axial ligand, JLU-Liu21 possesses more OMSs than JLU-Liu20, and exhibits a significant enhancement of CO2 uptake capacity 210 versus 162 cm(3) g(-1) for JLU-Liu20 at 273 K under 1 bar.