Functionalization of Metal–Organic Framework via Mixed-Ligand Strategy for Selective CO₂Sorption at Ambient Conditions

Abstract

A new three-dimensional Zn(II) metal–organic framework (MOF) of {[Zn 4 (bpydb) 3 (datz) 2 (H 2 O)](DMF) 4 (EtOH) 5 (H 2 O) 8 } n ( 1, bpydbH 2 = 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 6 3 layers pillared by datz – ligands. The adsorption properties of this MOF were studied by CO 2, N 2, and CH 4 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 CO 2 sorption capacity and good sorption selectivity for CO 2 over N 2 and CH 4 at room temperature.