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A porous metal-organic frameworks(1)based on 1,3,5-tris(1-imidazolyl)-benzene(tib)and 5-(3,5-dicarboxylphenyl)nicotinic acid(H3dcpna)has been synthesized and characterized.Singlecrystal X-ray diffraction analysis reveals that Co(Ⅱ)centers as 3-connected node are linked by tib and dcpna to form a 3D porous frameworks with a wei topology.