Hydrothermal Synthesis, Crystal Structure, and Characterizations of a New Lanthanide Oxalatophosphonate with a 3D Framework Structure

Abstract

AbstractA new lanthanide oxalatophosphonate with a 3D framework, [Nd2(HL)(C2O4)2(H2O)3]·H2O (1) (H3L = HOOCC5H9NCH2PO3H2) was synthesized by hydrothermal reaction at 140 °C by using carboxyphosphonic acid as phosphonate ligand and oxalate as additional metal linker. It was structurally characterized by single‐crystal as well as powder X‐ray diffraction methods, infrared spectroscopy, elemental analysis, and thermogravimetric analysis. In compound 1, the interconnection of the neodymium(III) ions by chelating and bridging oxalate anions leads to a neodymium oxalate layer, these layers are further bridged by carboxyphosphonate ligands to form a 3D framework structure. It is interesting that the result of these connections is the formation of 20‐ and 16‐atom rings that are parallel to one another and run in the b axis direction.