Synthesis and Structure of Strontium and Barium Uranyl Methacrylates

Abstract

Synthesis, X-ray diffraction analysis, and IR spectroscopy of Sr₂[UO₂(CH₂C(CH₃)COO)₃]₄ · 26H₂O (I) and Ba₂[UO₂(CH₂C(CH₃)COO)₃]₄ · 26H₂O (II) (CH₂C(CH₃)COO⁻ is a methacrylate ion) crystals have been performed. The uranium-containing structural units I and II are one-core complexes [UO₂(CH₂C(CH₃)COO)₃]⁻, which belong to the crystallochemical group \(AB_{3}^{{0{\text{1}}}}\) (А = \({\text{UO}}_{2}^{{2 + }}\), B⁰¹ = CH₂C(CH₃)COO⁻) of uranyl complexes. Is established that the parallel orientation of methacrylate anions of neighboring uranium-containing complexes plays an important structure-forming role in crystals I and II. The bulk layers formed due to the interactions of methacrylate anions contain voids, which are occupied by Sr or Ba cations. Linking of structural fragments into a framework is due to the formation of a system of hydrogen bonds and electrostatic and van der Waals interactions.