title: Tetrapotassium dicarbonatodioxoperoxouranium(VI) 2.5-hydrate, K4[U(CO3)2O2(O2)].2.5H2O.
abstract: The title compound was obtained by reacting UO2 powder in 2 M K2CO3 with hydrogen peroxide. The compound contains individual [U(CO3)2O2(O2)]4- ions, which are linked via an extended network of K atoms and hydrogen bonding. The U atom is coordinated to two trans-axial O atoms and six O atoms in the equatorial plane, forming distorted hexagonal bipyramids. The carbonate ligands are bound to the U center in a bidentate manner, with U-O bond distances ranging from 2.438 (5) to 2.488 (5) A. The peroxo group forms a three-membered ring with the U atom, with U-O bond distances of 2.256 (6) and 2.240 (6) A. The U=O bond distances of 1.806 (5) and 1.817 (5) A, and an O-U-O angle of 175.3 (3) degrees are characteristic of the linear uranyl(VI) unit.
authors.affiliation: Los Alamos National Laboratory, Chemistry Division, Los Alamos, NM 87545, USA.
authors.forename: Ralph A
authors.initials: RA
authors.lastname: Zehnder
authors.forename: Shane M
authors.initials: SM
authors.lastname: Peper
authors.forename: Brian L
authors.initials: BL
authors.lastname: Scott
authors.forename: Wolfgang H
authors.initials: WH
authors.lastname: Runde