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  • 1
    ISSN: 0044-2313
    Keywords: Cesium copper(II) fluoride, CsCu2F5 ; crystal structure ; magnetism ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure of Cesium-containing Fluorides. IX. CsCu2F5, a Compound exhibiting Coordination Numbers 4, 5, and 6 for Copper(II)Single crystals of the monoclinic compound CsCu2F5 (a = 713.5, b = 738.6, c = 950.2 pm, β = 97.19°; P21/n, Z = 4) were prepared and their structure determined by X-ray methods (wR = 0.045 for 2140 independent reflections). Besides of square planar and elongated octahedral [CuFn] units (average Cu—F = 190.3 resp. 195.0/221.9 pm), the structure exhibits the first example of [CuF5] coordination, which is a distorted square pyramide (Cu—F = 190.7/221.6 pm). Relations to the pyrochlore structure are discussed, as well as the linking of polyhedra and the bridge angles Cu—F—Cu in context with the antiferromagnetic properties (TN = 54 K), which were found by powder susceptibility measurements.
    Notes: Einkristalle der monoklinen Verbindung CsCu2F5 (a = 713,5, b = 738,6, c = 950,2 pm, β = 97,19°; P21/n, Z = 4) wurden dargestellt und ihre Struktur röntgenographisch bestimmt (wR = 0,045 für 2140 unabhängige Reflexe). Neben quadratisch planaren und gestreckt oktaedrischen [CuFn]-Baugruppen (Mittelwerte Cu—F = 190,3 bzw. 195,0/221,9 pm) zeigt die Struktur das erste Beispiel einer [CuF5]-Koordination in Form einer verzerrten quadratischen Pyramide (Cu—F = 190,7/221,6 pm). Beziehungen zur Pyrochlorstruktur werden diskutiert, sowie die Vernetzung der Polyeder und die Brückenwinkel Cu—F—Cu im Zusammenhang mit den antiferromagnetischen Eigenschaften (TN = 54 K), die durch Suszeptibilitätsmessungen an Pulvern ermittelt wurden.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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