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

摘要

Three new polynuclear lanthanide coordination polymers [Ln(5)(μ(3)-OH)(oba)(7)(H2O)(2)](n)(.)0.5nH(2)O (Ln = Eu (1), Ho (2)) and [Yb-6(oba)(9)(H2O)](n) (3) (H(2)oba = 4,4'-oxybis(benzoic acid)), were prepared by hydrothermal reactions. 1 and 2 are isomorphous and exhibit complicated three-dimensional structures based on [Ln(5)(μ(3)-OH)(oba)(7)(H2O)(2)] building blocks. In the asymmetric unit, there are five different coordination environments of Ln(III) ions, including a trinuclear hydroxo core. Complex 3 is a three-dimensional coordination polymer built tip from a hexanuclear building block. In 3, Yb(III) ions have six different chemical environments and are in a regular arrangement, resulting in pseudohexagonal prisms along the α-axis. The luminescent property of 1 and magnetic behaviors of 2 and 3 have also been studied. © 2005 Elsevier Ltd. All rights reserved.