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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 410 (1974), S. 32-38 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structure of a Triclinic Modification of Uranium PentachlorideFrom solution uranium pentachloride crystallizes at room temperature in a triclinic modification belonging to the space group P1. The unit cell contains one formula unit (UCl5)2 and has the dimensions a = 707, b = 965, c = 635 pm and α = 0.495 π, β = 0.652 π, γ = 0.603 π rad. The crystal structure was solved with the aid of X-ray diffraction data and was refined to a reliability index of R = 0.082. The structure consists of (UCl5)2 molecules having the point symmetry mmm in which the uranium atoms are linked with one another via two chlorine atoms. The crystal lattice can be derived from a hexagonal closest packing of chlorine atoms in which 1/5 of all octahedral holes are occupied by uranium atoms.
    Notes: Aus einer Lösung kristallisiert Uranpentachlorid bei Zimmer-temperature in einer triklinen Modifikation (Raumgruppe P1). Die Elementarzelle enthält eine Formeleinheit (UCl5)2 und hat die Maße a = 707, b = 965, c = 635 pm und α = 0,495 π, β = 0,652 π, γ = 0,603 π rad. Die Kristallstruktur wurde mit Hilfe von Röntgenbeugungsdaten aufgeklärt und bis zu einem Zuverlässigkeitsindex von R = 8,2% verfeinert. Die Struktur ist aus Molekülen (UCl5)2 mit der Punktsymmetrie mmm aufgebaut, in welchen die Uranatome über 2 Chloratome miteinander verbrückt sind. Die Gesamtstruktur läßt sich von einer hexagonal dichtesten Packung von Chloratomen ableiten, in welcher 1/5 aller Oktaederlücken durch Uranatome besetzt sind.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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