13536-84-0Relevant articles and documents
Ekstrom, A.,Batley, G. E.
, p. 1157 - 1161 (1973)
Mandelberg, C. J.,Davies, D.
, p. 58 - 61 (1961)
Ferris, L. M.
, p. 5419 - 5421 (1957)
Claassen, H. H.,Weinstock, B.,Malm, J. G.
, p. 426 - 427 (1956)
Hildenbrand, D. L.
, p. 4788 - 4794 (1977)
Synthesis and structure of a new modification of monoaquadifluorouranyl hydrate
Mikhailov,Gorbunova,Stolyarov,Moiseev
, p. 1821 - 1826 (2008/10/08)
A new modification of monoaquadifluorouranyl hydrate was synthesized. Its composition and structure were determined by X-ray diffraction. The crystal is monoclinic: a = 13.843(3) ?, b = 9.801(3) ?, c = 24.970(5) ?, β= 104.47(3)°; space group C2/c. A unit cell (V = 3280(1) ?3) contains four formula units [(UO2) 7F14(H2O)7]·4H2O. The structure includes four nonequivalent uranium atoms: one of them (U(4)) occupies a special position (0, y, 1/4); the oxygen atom (O(11)) of one of the four coordinated water molecules is in the same position. Therefore, the compound can be formulated as [(UO2)3.5F 7(H2O)3.5]·2H2O; consequently, in space group C2/c, Z = 8. This composition corresponds to the stoichiometry of the low-water-content monodifluorouranyl hydrate [UO 2F2H2O]·0.57H2O. A uranyl compound with such a composition has not heretofore been described.
Preparation and Characterization of U2O2F7
Asada, Kameo,Ema, Keiko,Iwai, Takashi
, p. 3189 - 3194 (2007/10/02)
Reaction of UO2F2 with UF5 at 400 deg C under UF6-pressure of 3 atm followed by evaporation of excess UF5 has yielded a greenish white residue.Its X-ray diffraction pattern and infrared spectrum are sufficiently unique to establish that this material is a true compound.Its chemical formula has been shown to be U2O2F7, on the grounds of chemical analysis and thermal decomposition.The oxygen content was determined directly by means of 18O isotopic dilution method based on the combustion of the samples with BrF5.
