Synthesis and crystal structure of bis(tetramethylammonium) aquotetra-fluorodioxouranate(VI) dihydrate, [(CI 3) 4 N] 2[UO 2 F 4(H 2 O)]·2H 2O

Abstract

The title compound has been synthesized and subjected to crystal structure analysis. M r = 548.50, m.p. 108.1 °C (decom.), orthorhombic, Im2m,a = 7.006(2), b = 8.938(2), c = 13.619(2) Å V = 852.8(3) Å 3, Z = 2, D x = 2.136, D m, (flotation in CCl 4/CH 2I 2) = 2.128 g cm −3, λ(Mo-Kα) = 0.71069 Å, μ = 90.79 cm −1, F(000) = 519.89, T = 295 K, final R F = 0.036 and R G = 0.044 for 566 observed reflections. The discrete [UO 2F 4(H 20)] 2− anion has site symmetry m2 m, its virtually linear uranyl moiety being surrounded by fluoro and aquo ligands occupying the vertices of a pentagon in the equatorial plane. Watet molecules serve to link the complex anions by hydrogen bonds into layers, between which the organic cations are accommodated.