Single-crystal neutron diffraction: structure of sodium tris(acetato)dioxouranate(1–)
作者:A. Navaza、P. Charpin、D. Vigner、G. Heger
DOI:10.1107/s0108270191003165
日期:1991.9.15
Na[UO2(C2H3O2)3], M(r) = 467.09, cubic, P2(1)3, a = 10.691 (8) angstrom, V = 1222 (3) angstrom 3, Z = 4, D(x) = 2.562 g cm-3, lambda = 0.831 (1) angstrom, mu = 1.2 cm-1 (evaluated), F(000) = 258.9 fm for cell content, room temperature, R = 0.037, wR = 0.029 for 452 observed reflections. The structure of the compound determined by neutron diffraction is essentially the same as that obtained by X-ray diffraction, excluding the hydrogen atoms. The uranyl ion lies on the threefold axis surrounded by three symmetrically related acetate groups. The coordination polyhedron of the sodium atom is intermediate between an octahedron and a trigonal prism; six oxygen atoms from six different acetate ligands participate in this coordination. The hydrogen atoms of the methyl group are observed in two positions which do not coincide with those proposed from X-ray studies.