Uranyl Methacrylate Complexes with Carbamide and Methylcarbamide: Synthesis and Structure

Abstract

The synthesis and X-ray diffraction and IR spectroscopic study of (UO2)2(mac)4(L)3 · H2O crystals, where mac– is the methacrylate ion C3H5COO– and L is carbamide (I) or methylcarbamide (II), have been performed. Complexes I and II have a homotypic structure: crystals contain two kinds of mononuclear uranium-containing complexes, i.e., cationic [UO2(mac)(L)3]+ and anionic [UO2(mac)3]–. The crystallographic formula of complexes in structures I and II is AB01M 3 1 + AB 3 01 (A =UO22+ B01 = mac–, M1 = L). The uranium-containing complexes in structures I and II are linked into a framework by means of electrostatic interactions and a system of hydrogen bonds. Despite the similar compositions and structures of the uranium-containing complexes, their packings into a three-dimensional framework appreciably differ from each other.