The metal complexes of dicarboxylic acid derivatives were synthesized and their gas-storage properties were characterized. Metal complexes displaying various metal-organic frameworks with 4,5-imidazole-dicarboxylic acid ligand (L) with Mo(III), W(VI), Ce(III), Sm(III), and Sn(IV) were synthesized in order to examine their gas adsorption properties. The porous complexes were characterized by elemental analysis, FT-IR, 1H-NMR, spectroscopic methods and microanalysis. Investigation of the structures of these complexes indicates that gases are most probably occluded in homogeneous and linear micropores which are composed of micropore units surrounded by dicarboxylate bridges. Gas storage and adsorption properties of these complexes were investigated via BET measurements. Sorption property of H2 and N2 was performed at temperature of 298 K and pressure of 1 bar.