Hydrothermal Synthesis and Crystal Structure of Lanthanum Orotate Supermolecule with A Honeycomb Structure Constructed from Mononuclear Molecules via Hydrogen Bonds

Abstract

A new complex of lanthanum orotate [La(C 5H 3N 2O 4) 2(OH)(H 2O) 6] · 2(C 5H 4N 2O 4) · 9H 2O was synthesized using a hydrothermal method. The crystal structure was determined with help of single crystal X-ray diffraction analysis. The complex crystallized in orthorhombic system, Cmc2(1) space group. In the complex, the center lanthanum (III) ion was nine-coordinated with coordination geometry of a distorted monocapped square antiprism, in which two of the nine coordinated oxygen atoms were from two orotate ligands in a monodentate mode, one oxygen atom from a hydroxyl, and the others from six coordinated water molecules. The mononuclear complex [La(C 5H 3N 2O 4) 2(OH)(H 2O) 6] · 2(C 5H 4N 2O 4) · 9H 2O was linked through the hydrogen bonds into an infinite supermolecular honeycomb structure.