81141-31-3Relevant academic research and scientific papers
Uranyl complexes of β-polyketonates. Crystal and molecular structure of a mononuclear uranyl 1,3,5-triketonate and a novel trinuclear uranyl 1,3,5-triketonate with a trigonal-planar bridging oxide
Lintvedt,Heeg,Ahmad,Glick
, p. 2350 - 2356 (2008/10/08)
Two uranyl complexes of 1,3,5-triketonate ligands have been crystallized and examined by X-ray diffraction techniques. The first is the mononuclear bis[1,5-diphenyl-1,3,5-pentanetrionato(1-)](methanol)dioxouranium(VI)-methanol, [UO2-(C35H30O7)(CH3OH)], UO2(H(DBA))2(CH3OH)·CH3OH, in which the uranium atom is bound to four enolic oxygens, two uranyl oxygens, and one methanolic oxygen. The triketonate ligands are in a cis configuration presumably due to the steric constraints of the methanol coordination. Crystal data are as follows: P21/c, a = 9.932 (4), b = 30.29 (4), c = 11.671 (4) A?; β = 103.03°, V = 3421 (2) A?3; Z = 4, R1 = 0.048, R2 = 0.050. The second is a trinuclear UO22+ anion containing a trigonal, tribridging oxide ion that results during attempts to prepare binuclear UO22+ complexes of 1,3,5-triketonates. The compound bis(triethylammonium) tris(2,2′,8,8′-tetramethyl-3,5,7-nonanetrionato)-μ 3-oxo-tris(dioxouranate)(2-), [(C2H5)3NH]2[U3O 6(C39H60O9)O], [(C2H5)3NH]2[(UO2) 3(DPA)3O], contains a nearly equilateral triangle of UO22+ ions with a central O2- ion trigonally bonded to the three U atoms. One triketonate occupies each edge of the triangle with the central enolic oxygen bridging two U atoms and the terminal oxygens bound to one U atom. Each U is seven-coordinate in nearly pentagonal-bipyramidal geometry. Crystal data are as follows: C2/c, a = 27.90 (2) b = 15.65 (2), c = 31.81 (3) A?; β = 107.8 (1)°, V = 13220 (20) A?3; Z = 8, R1 = 0.062, R2 = 0.078.
