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′-H2oba) 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.