Stepwise and hysteretic sorption of N-2, O-2, CO2, and H-2 gases in a porous metal-organic framework [Zn-2(BPnDC)(2)(bpy)]

A doubly interpenetrated 3D porous metal-organic framework (SNU-9) exhibits high gas uptake capacities for N-2, O-2, CO2, and H-2 gases, with uncommon stepwise adsorption and hysteretic desorption behaviors, while not adsorbing CH4 gas.