High-capacity gas storage by a microporous oxalamide-functionalized NbO-type metal-organic framework

A microporous oxalamide-functionalized NbO-type-metal organic framework, HNUST-3, has been designed and synthesized by self-assembling [Cu-2(COO)(4)] paddlewheel SBUs and a novel tetracarboxylate ligand with linking oxalamide groups. HNUST-3 represents the first example of a porous oxalamide-functionalized MOF, which exhibits a high BET surface area of 2412 m(2).g(-1), large H-2 uptake (unsaturated total capacity of 6.1 wt % at 20 bar and 77 K), and excellent CH4 storage (135.8 cm(3)(STP)cm(-3) at 20 bar and 298 K) as well as high CO2 adsorption capacity (20.2 mmol.g(-1) at 20 bar and 298 K) with good selectivity for CO2 over CH4 (7.9) and N-2 (26.1) at 298 K.