Synthesis, structures, and luminescence of lanthanide coordination polymers constructed from benzimidazole-5,6-dicarboxylate and oxalate ligands

Three novel coordination polymers [(Eu2(Hbidc)2(ox)2·(H2O)3] (1), [Tb2(Hbidc)2(ox)(H2O)2]·4H2O (2), [Er2(Hbidc)2(ox)] (3) have been synthesized with hydrothermal reaction (H3bidc = Benzimidazole-5,6-dicarboxylic acid, H2ox = Oxalic acid) and characterized by elemental analysis, IR and X-ray single crystal diffraction. 1, 2 and 3 have the same crystal system of triclinic, but they exhibit different kinds of metal-organic framework structures. The luminescent properties of 1 and 2 were studied at room temperature.