Open metal site (OMS) and Lewis basic site (LBS)-functionalized copper-organic framework with high CO2 uptake performance and highly selective CO2/N-2 and CO2/CH4 separation

In this work, a multifunctional microporous metal-organic framework (MOF), [Cu-2(BPDC)(2)(H2O)(2)].5.6H(2)O.DMA (1, BPDC = 5,5'-dicarboxylate-3,3 '-dipyridine anion and DMA = dimethylacetamide), has been synthesized based on the ligand BPDC under solvothermal conditions. Single crystal X-ray analysis reveals that it possesses a non-interpenetrating binodal (4,4)-connected three-dimensional PtS-type network with the Schlafli point symbol of {4(2).8(4)}. Remarkably, the activated 1 (1a) with dual functionalities of open metal sites (OMSs) and O-rich Lewis basic sites (LBSs) exhibits excellent CO2 adsorption (193 cm(3) g(-1) at 298 K) and high-effect separation ability (41.5 for CO2/N-2 = 15/85 and 9.7 for CO2/CH4 = 5/95 under 1 bar at 298 K). Additionally, 1a exhibits impressive performance for I-2 sorption and release in solvents.