Synthesis and Structure of Strontium and Barium Uranyl Methacrylates

Synthesis, X-ray diffraction analysis, and IR spectroscopy of Sr 2 [UO 2 (CH 2 C(CH 3 )COO) 3 ] 4 · 26H 2 O ( I ) and Ba 2 [UO 2 (CH 2 C(CH 3 )COO) 3 ] 4 · 26H 2 O ( II ) (CH 2 C(CH 3 )COO − is a methacrylate ion) crystals have been performed. The uranium-containing structural units I and II are one-core complexes [UO 2 (CH 2 C(CH 3 )COO) 3 ] − , which belong to the crystallochemical group ( А = , B 01 = CH 2 C(CH 3 )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.