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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 523 (1985), S. 89-98 
    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 the Compounds BaCaGaF7 and BaCaCrF7The isostructural fluorides BaCaGaF7 and BaCaCrF7 (values in parentheses) crystallize monoclinically in space group P2/n, Z = 4: a = 539.0 (539.8), b = 541.0 (542.2), c = 1897.8 (1900.6) pm, β = 92.33 (92.10)°. Complete X-ray single crystal structure determinations showed, that the compounds are built up from triple layers [CaF8/2 · MF3]2-, which consist of a central sheet of edge-sharing CaF8/22- polyhedra (distorted square antiprisms) with MIIIF6octahedra condensed on it at both sides and which are held together by 12-coordinated barium ions. The resulting average distances are: Ga—F = 187.8 (Cr—F = 189.4) pm, Ca — F = 236.2 (236.2) pm, Ba—F = 289.4 (289.4) pm. Some relations to the structures of other fluorides are discussed.
    Notes: Die isostrukturellen Fluoride BaCaGaF7 und BaCaCrF7 ( Werte in Klammern) kristallisieren monoklin in der Raumgruppe P2/n, Z = 4: a = 539,0 (539,8), b = 541,0 (542,2), c = 1897,8 (1900,6) pm, β = 92,33 (92,10)°. Vollständige röntgenographische Einkristallstrukturbestimmungen zeigten, daß sie aus Dreierschichten [CaF8/2 · MF3]2- aufgebaut sind, die aus einer zentralen Schicht kantenverknüpfter CaF8/22--Polyeder (verzerrte quadratische Antiprismen) mit beidseitig aufgesetzten MIIIF6-Oktaedern bestehen und durch Bariumionen in Zwölferkoordination zusammengehalten werden. Als mittlere Abstände resultierten: Ga—F = 187,8 (Cr—F = 189,4) pm, Ca—F = 236,2 (236,5) pm, Ba—F = 289,4 (289,4) pm, Beziehungen zu den Strukturen verwandter Fluoride werden diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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