Functionalization of Metal–Organic Framework via Mixed-Ligand Strategy for Selective CO2 Sorption at Ambient Conditions

A new three-dimensional Zn­(II) metal–organic framework (MOF) of {[Zn4(bpydb)3­(datz)2­(H2O)]­(DMF)4(EtOH)5­(H2O)8}n (1, bpydbH2 = 4,4′-(4,4′-bipyridine-2,6-diyl) dibenzoic acid, Hdatz = 3,5-diamino-1,2,4-triazole) with amino- and pyridine-functionalized pores has been successfully constructed under solvothermal conditions by using the mixed-ligand strategy, which consists of twisty 63 layers pillared by datz– ligands. The adsorption properties of this MOF were studied by CO2, N2, and CH4 sorption measurements. Compared with the analogous 4,4′-bipyridine (bpy) pillared MOF {Zn­(bpydb)­(bpy)}n (2) we reported earlier, the activated 1 showed enhanced CO2 sorption capacity and good sorption selectivity for CO2 over N2 and CH4 at room temperature.