A new NbO type metal–organic framework [Cu2(NPA)(H2O)2](DMF)5.5(H2O)0.5 (ZJU-9, H4NPA = 1,5-naphthalene-m-phthalic acid) with moderately high permanent porosity, open metal sites and appropriate pore sizes was designed and synthesized, exhibiting high storage capacities for both acetylene and methane at room temperature.
