title: Insight into the Uranyl Oxyfluoride Topologies through the Synthesis, Crystal Structure, and Evidence of a New Oxyfluoride Layer in [(UO2)4F13][Sr3(H2O)8](NO3)·H2O.
abstract: A new strontium uranyl oxyfluoride, [(UO2)4F13][Sr3(H2O)8](NO3)·H2O, was synthesized under hydrothermal conditions. The single-crystal X-ray structure was determined. This compound crystallizes in the triclinic space group P1̅ (No. 2), with unit cell parameters a = 10.7925(16) Å, b = 10.9183(16) Å, c = 13.231(2) Å, α = 92.570(8)°, β = 109.147(8)°, γ = 92.778(8)°, V = 1468.1(4) Å3, and Z = 2. The structure is built from uranyl-containing [Formula: see text] chains of tetrameric units of corner-sharing UO2F5pentagonal bipyramids. These chains are linked through trimeric strontium units to form strontium-uranyl oxyfluoride layers further assembled by nitrate groups. The interlayer space is occupied by free water molecules. This compound was characterized by spectroscopic methods, especially19F NMR highlighting the many different fluoride sites. Structural relationships with other uranyl oxyfluorides were investigated through the different F/O ratios, the structural building unit, and the structural arrangement.
authors.affiliation: Institut de Chimie de Clermont-Ferrand, ICCF-UMR 6296,Campus Universitaire des Cézeaux , 24 avenue Blaise Pascal, 63178 AUBIERE Cedex, France.
authors.forename: Laurent J
authors.initials: LJ
authors.lastname: Jouffret
authors.affiliation: Institut de Chimie de Clermont-Ferrand, ICCF-UMR 6296,Campus Universitaire des Cézeaux , 24 avenue Blaise Pascal, 63178 AUBIERE Cedex, France.
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Hiltbrunner
authors.affiliation: Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide , F-59000 Lille, France.
authors.forename: Murielle
authors.initials: M
authors.lastname: Rivenet
authors.affiliation: Univ. Grenoble Alpes, LEPMI , F-38000 Grenoble, France.|CNRS, LEPMI , F-38000 Grenoble, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Sergent
authors.affiliation: Univ. Grenoble Alpes, LEPMI , F-38000 Grenoble, France.|CNRS, LEPMI , F-38000 Grenoble, France.
authors.forename: Saïd
authors.initials: S
authors.lastname: Obbade
authors.affiliation: Institut de Chimie de Clermont-Ferrand, ICCF-UMR 6296,Campus Universitaire des Cézeaux , 24 avenue Blaise Pascal, 63178 AUBIERE Cedex, France.
authors.forename: Daniel
authors.initials: D
authors.lastname: Avignant
authors.affiliation: Institut de Chimie de Clermont-Ferrand, ICCF-UMR 6296,Campus Universitaire des Cézeaux , 24 avenue Blaise Pascal, 63178 AUBIERE Cedex, France.
authors.forename: Marc
authors.initials: M
authors.lastname: Dubois