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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of a High Temperature Modification of Barium-Zinc-Iron(III) Fluoride BaZnFeF7A metastable high temperature form of BaZnFeF7 prepared at 750°C crystallizes monoclinically (a = 560.3(1), b = 997,1(3), c = 958.4(4) pm, β = 92.80(4)°, Z = 4) in the same space group P21/c as the low temperature form. The X-ray structure determination (RG = 5.2— for 2426 independent reflections) showed analogy in the coordination behaviour of Zn2+ and Fe3+ cations, which occupy in an ordered way groups of two edgesharing octahedra, at each of which one ligand remains unbridged (mean distances Zn—F = 204.7 pm, Fe—F = 194.6 pm). The linking of double octahedra via corners to form a threedimensional framework involves strongly bent fluorine bridges (average Zn—F—Fe = 126.5°). Related structures are discussed.
    Notes: Eine bei 750°C in Einkristallen dargestellte metastabile Hochtemperatur-form von BaZnFeF7 kristallisiert monoklin (a = 560,3(1), b = 997,1(3), c = 958,4(4) pm, β = 92,80(4)°, Z = 4) in derselben Raumgruppe P21/c, wie die Tieftemperaturform. Die röntgenographische Strukturbestimmung (RG = 5,2 -  für 2 426 unabhängige Reflexe) ergab koordinationschemisch analoges Verhalten für Zn2+- und Fe3+-Kationen, die geordnet kantenverknüpfte Gruppen von zwei Oktaedern besetzen, an denen je ein Ligand unverbrückt bleibt (mittlere Abstände Zn—F = 204,7 pm, Fe—F = 194,6 pm). Die Eckenverknüpfung der Doppeloktaeder zu einer Raumnetzstruktur verläuft über stark gewinkelte Fluorbrücken (Mittel Zn—F—Fe = 126,5°). Verwandte Strukturen werden diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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