Synthesis and Structures of Three Erbium(Ⅲ) Dicarboxylate Coordination Polymers

Three polymeric erbium(Ⅲ) complexes [Er(oba)(Hoba)(H2O)2]H2O (A),[Er2(oba)3(H2O)4] (B), [Er2(oba)3(2,2′-bpy)2] (C) (H2oba=4,4′-oxybis(benzoic acid), 2,2′-bpy = 2,2′-bipyridine) were hydrothermally synthesized by altering the metal/carboxylate ratios or in the presence of an additional chelate 2,2′-bpy ligand, and characterized by single-crystal X-ray diffraction. The results show that different metal/carboxylate ratios can influence the polymeric structures and the presence of 2,2′-bpy ligand alters the topology of the framework from two-dimensional to three-dimensional.