title: Comprehensive Characterization of the Electronic Structure of U(4+) in Uranium(IV) Phosphate Chloride.
abstract: Emerald-green single crystals of U(PO4)Cl were grown by chemical vapor transport in a temperature gradient (1000 → 900 °C). The crystal structure of U(PO4)Cl (Cmcm, Z = 4, a = 5.2289(7) Å, b = 11.709(2) Å, c = 6.9991(8) Å) consists of a three-dimensional network of [PO4] tetrahedra and bicapped octahedral [U(IV)O6Cl2] groups. Polarized absorption spectra measured for two perpendicular polarization directions show a large number of well-resolved electronic transitions. These transitions can be fully assigned on the basis of a detailed ligand-field treatment within the framework of the angular overlap model. The magnetic behavior predicted on the basis of the spectroscopic data is in agreement with an f (2) system and perfectly matched by the results of temperature-dependent susceptibility measurements.
authors.affiliation: Institute of Inorganic Chemistry, Rheinische Friedrich-Wilhelms-Universität , Gerhard-Domagk-Straße 1, D-53121 Bonn, Germany.
authors.forename: Anna
authors.initials: A
authors.lastname: Bronova
authors.affiliation: Institute of Inorganic Chemistry, Rheinische Friedrich-Wilhelms-Universität , Gerhard-Domagk-Straße 1, D-53121 Bonn, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Droß
authors.affiliation: Institute of Inorganic Chemistry, Rheinische Friedrich-Wilhelms-Universität , Gerhard-Domagk-Straße 1, D-53121 Bonn, Germany.
authors.forename: Robert
authors.initials: R
authors.lastname: Glaum
authors.affiliation: Institute of Inorganic Chemistry, RWTH Aachen , Professor-Pirlet-Str. 1, D-52074 Aachen, Germany.
authors.forename: Heiko
authors.initials: H
authors.lastname: Lueken
authors.affiliation: Institute of Inorganic Chemistry, RWTH Aachen , Professor-Pirlet-Str. 1, D-52074 Aachen, Germany.
authors.forename: Manfred
authors.initials: M
authors.lastname: Speldrich
authors.affiliation: Institute of Inorganic Chemistry, Leibniz Universität Hannover , Callinstrasse 9, D-30167 Hannover, Germany.|Chemistry Department, University of Fribourg , Chemin du Musée 9, CH-1700 Fribourg, Switzerland.
authors.forename: Werner
authors.initials: W
authors.lastname: Urland