Three Novel Heterobimetallic Cd/Zn−Na Coordination Polymers: Syntheses, Crystal Structure, and Luminescence

Three novel heterobimetallic coordination polymers, {Na2[Cd(odpa)(H2O)]}n (1), {Na2[Zn(odpa)(H2O)]}n (2), and {Na2[Cd3(odpa)2(H2O)5]·1.5H2O}n (3) (H4odpa = 4,4′-oxydiphthalic acid), have been prepared under solvothermal conditions and characterized by single-crystal X-ray diffraction. Compounds 1 and 2 are unprecedented 2D bilayer anion networks containing 26- and 24- membered channels made of Cd/Zn polyhedra linked by (odpa)4− ligand, while a novel 2D Na−O network is inserted subtly in the bilayer networks. Compound 3 presents a three-dimensional coordination polymer based on both tetranuclear and hexanuclear heterobimetallic clusters containing one-dimensional hydrophilic channels, where guest water molecules reside. Furthermore, these heterobimetallic clusters connected to each other to build a Cd−Na polyhedral network existing in a 3D anion framework. Compounds 1−3 are all heterobimetallic Cd/Zn−Na compounds containing polymeric anions, which have not been reported in all coordination polymers of (odpa)4− ligand. In 1−3, central CdII/ZnII ions and (odpa)4− ligand display completely different coordination modes and conformations. In addition, the thermal stabilities and photoluminescence properties were also studied.