Porous metal oxide and method of preparing the same

A method of preparing a porous metal oxide, comprising heat treating a coordination polymer, the heat treating comprising:

• a first heat treatment process conducted under an inert atmosphere;
• and
• a second heat treatment process conducted under an oxygen-containing atmosphere, wherein the coordination polymer comprises a compound having a unit structure represented by Formula 1:
• MxLySz Formula 1
• wherein M is a metal selected from the group consisting of transition metals, Group 13 metals, Group 14 metals, Group 15 metals, lanthanides, actinides and combinations thereof, L is a multi-dentate ligand capable of forming ionic or covalent bonds with at least two metal ions, S is a mono-dentate ligand capable of forming an ionic or covalent bond with one metal ion, wherein d represents a number of functional groups of L capable of binding to a metal ion, wherein x, y and z are integers satisfying Equation 1:
• yd+z≦6x Equation 1
• and wherein the multi-dentate ligand is selected from the group consisting of trimesate-based ligands represented by Formula 4, terephthalate-based ligands represented by Formula 5, 4,4′-bipyridine-based ligands represented by Formula 6, 2,6-naphthalenedicarboxylate-based ligands represented by Formula 7, pyrazine-based ligands represented by Formula 8 and combinations thereof:
• wherein R1 to R25 are each independently selected from the group consisting of hydrogen atoms, halogen atoms, hydroxy groups, substituted C1-20 alkyl groups, unsubstituted C1-20 alkyl groups, substituted C1-20 alkoxy groups, unsubstituted C1-20 alkoxy groups, substituted C2-20 alkenyl groups, unsubstituted C2-20 alkenyl groups, substituted C6-30 aryl groups, unsubstituted C6-30 aryl groups, substituted C6-30 aryloxy groups, unsubstituted C6-30 aryloxy groups, substituted C2-30 heteroaryl groups, unsubstituted C2-30 heteroaryl groups, substituted C2-30 heteroaryloxy groups, unsubstituted C2-30 heteroaryloxy groups and combinations thereof.