Patent ID: 8758482

Claim:
A method of separating carbon dioxide from a mixture of gases, the method comprising the steps of: a) passing the gas mixture through a porous three-dimensional polymeric coordination compound characterized by a plurality of layers comprising two-dimensional arrays of repeating structural units, each repeating structural unit comprising at least one transition or post-transition metal atom or cation coordinated to: (1) at least one binding member of a bidentate binding site on each of two polyfunctional ligands of Formula I wherein L 1 is a bond or a linker, said linker being linear or ring, substituted or non-substituted, saturated or unsaturated group comprising between 1 and 6 atoms independently selected from the group consisting of C, N and S; and (2) one binding site of a bis-pyridine exodentate bridging ligand of Formula II: wherein L 2 is a bond or a linear, substituted or non-substituted, saturated or unsaturated linker containing between 2 and 6 atoms independently selected from the group consisting of C, N and S; and wherein: (i) at least one binding member of a second bidentate binding site on each polyfunctional ligand is further coordinated to at least one transition metal atom or cation in a different repeating structural unit within the same layer containing a two-dimensional array of repeating structural units; (ii) the exodentate bridging ligand extends essentially perpendicularly from a plane defined by said layer containing a two-dimensional array of repeating structural units to further coordinate with a transition metal atom in a repeating structural unit in an adjacent layer; and (iii) the ligands of the three-dimensional polymeric compound define channels and pores of molecular size throughout the structure of the compound; and (b) recovering the resulting mixture, wherein the resulting mixture has a decreased carbon dioxide content.