title: Cs2USi6O15: a tetravalent uranium silicate.
abstract: A uranium(IV) silicate has been synthesized under high-temperature, high-pressure hydrothermal conditions. The structure consists of unbranched dreier single layers with the composition [Si(2)O(5)] that are connected by UO(6) octahedra to form a 3D framework with 7-ring channels where the Cs(+) cations are located. Each UO(6) octahedron spans four neighboring dreier single chains and, therefore, introduces a high degree of corrugation in the silicate layers. The U 4f X-ray photoelectron spectroscopy spectrum was measured to confirm the valence state of the uranium. A comparison of related metal silicate structures is made. After the synthesis of this compound, all members in the family of uranium silicates and germanates with oxidation states of uranium from 4+ to 6+ have been observed.
authors.affiliation: Department of Chemistry, National Central University, Jhongli, Taiwan 320.
authors.forename: Hsin-Kuan
authors.initials: HK
authors.lastname: Liu
authors.forename: Kwang-Hwa
authors.initials: KH
authors.lastname: Lii