title: Precipitation of a dioxouranium(VI) species from a room temperature ionic liquid medium.
abstract: The novel complex 1-butyl-3-methylimidazolium mu(4)-(O,O,O',O'-ethane-1,2-dioato)-bis[bis(nitrato-O,O)dioxouranate(VI)] (1) has been precipitated from a room-temperature ionic liquid medium containing 1-butyl-3-methylimidazolium nitrate, nitric acid, and acetone. X-ray analysis of complex 1 shows the unit cell contains four [C(4)mim](+) cations and two independent [[UO(2))(NO(3))(2)](2)(mu(4)-C(2)O(4))](2-) moieties, both of which are located about inversion centers. The [C(4)mim](+) cations are arranged such that they produce large channels in which the anions are located. This arrangement of [[(UO(2))(NO(3))(2)](2)(mu(4)-C(2)O(4))](2-) groups is unique to this compound. Crystal data for compound 1: M = 1154.56, monoclinic, space group P2(1)/c, a = 15.452(2) A, b = 20.354(3) A, c = 10.822(4) A, beta = 106.84(2) degrees, U = 3258(1) A(-)(3), Z = 4, mu = 10.023 mm(-1), R(int) = 0.0788.
authors.affiliation: School of Chemistry and The Quill Research Centre, The Queen's University of Belfast, Stranmillis Road, Belfast BT9 5AG, Northern Ireland.
authors.forename: Antonia E
authors.initials: AE
authors.lastname: Bradley
authors.forename: Justine E
authors.initials: JE
authors.lastname: Hatter
authors.forename: Mark
authors.initials: M
authors.lastname: Nieuwenhuyzen
authors.forename: William R
authors.initials: WR
authors.lastname: Pitner
authors.forename: Kenneth R
authors.initials: KR
authors.lastname: Seddon
authors.forename: Robert C
authors.initials: RC
authors.lastname: Thied