Metal-organic frameworks of the family M.sub.2 (2,5-dioxido-1,4-benzenedicarboxylate) wherein M=Mg, Mn, Fe, Co, Cu, Ni or Zn are a group of porous crystalline materials formed of metal cations or clusters joined by multitopic organic linkers that can be used to isolate individual gases from a stream of combined gases. This group of adsorbant materials incorporates a high density of coordinatively-unsaturated M.sup.II centers lining the pore surfaces. These adsorbents are particularly suited for selective carbon dioxide/monoxide adsorption via pressure swing adsorption near temperatures of 313 K since they selectively adsorb carbon dioxide at high pressures in the presence of hydrogen, and desorb carbon dioxide upon a pressure decrease. The redox-active Fe.sup.II centers in Fe.sub.2(dobdc) can be used for the separation of O.sub.2 from N.sub.2 and other separations based on selective, reversible electron transfer reactions. Gas storage, such as acetylene storage, and catalysis, such as oxidation, are also useful applications of these materials.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 This invention was made with Government support under Grant No. DE-SC0001015 awarded by the Department of Energy. The Government has certain rights in this invention.