Synthesis and characterization of new polynuclear lanthanide coordination polymers with 4,4′-oxybis(benzoic acid)

Three new polynuclear lanthanide coordination polymers [Ln5(μ3-OH)(oba)7(H2O)2]n · 0.5nH2O (Ln = Eu (1), Ho (2)) and [Yb6(oba)9(H2O)]n (3) (H2oba = 4,4′-oxybis (benzoic acid)), were prepared by hydrothermal reactions and characterized by single crystal X-ray diffraction. They show complicated three-dimensional structures based on building blocks of polynuclear lanthanide species.