title: Cs4UGe8O20: a tetravalent uranium germanate containing four- and five-coordinate germanium.
abstract: A very rare tetravalent uranium germanate has been synthesized under hydrothermal conditions at 585 °C and 160 MPa. Its structure contains layers of single-ring Ge(3)O(9)(6-) germanate anions that are connected by UO(6) octahedra and dimers of edge-sharing GeO(5) trigonal bipyramids to form a three-dimensional framework with intersecting 6- and 7-ring channels. UV-visible, photoluminescence, and U 4f X-ray photoelectron spectroscopy were used to confirm the valence state of uranium.
authors.affiliation: Department of Chemistry, National Central University, Jhongli, Taiwan 320, Republic of China.
authors.forename: Quang Bac
authors.initials: QB
authors.lastname: Nguyen
authors.forename: Kwang-Hwa
authors.initials: KH
authors.lastname: Lii