Two lanthanide-natrium pillared-layer frameworks constructed from 4,4′-oxybis(benzoic acid) and oxalate

Two new heterometallic lanthanide(III)-natrium(I) coordination polymers [LnNa(4.4'-oba)(ox)(H2O)] (Ln = Nd 1, Sm 2) have been synthesized by hydrothermal reactions of 4,4'-Oxybis(benzoic acid) (4,4'-H(2)oba) and Na2C2O4 with corresponding lanthanide nitrate. Both compounds are isostructural and possess three-dimensional (3D) pillared-layer frameworks comprising Ln-Na-oxalate layers and 4,4'-oba pillars. The magnetic properties reveal that the two compounds have anti-ferromagnetic behaviors. Furthermore, the IR, PXRD, elemental and TG analyses are also investigated. (C) 2011 Elsevier B.V. All rights reserved.