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  • Chemistry  (2)
  • Cesium copper(II) fluoride, CsCu2F5
  • IR Spectra
  • Cyano-elpasolites
  • Wiley-Blackwell  (2)
  • 1990-1994  (2)
  • 1993  (1)
  • 1990  (1)
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Keywords
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  • Wiley-Blackwell  (2)
Years
  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Jahn-Teller-Effekt und Kristallstruktur-Verzerrung bei den Kupfer-Fluorperowskiten NaCuF3 und RbCuF3Professor Dirk Reinen zum 60. Geburtstage am 5. Mai 1990 gewidmet (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 585 (1990), S. 93-104 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Jahn-Teller Effect and Crystal Structure Distortion of the Copper Fluoroperovskites NaCuF3 and RbCuF3The crystal structures of triclinic NaCuF3 (a = 539.1, b = 555.2, c = 792.8 pm, α = 90.66, β = 92.05, γ = 86.95°; P1, Z = 4) and of tetragonal RbCuF3, isotypic with KCuF3, (a = 602.3, c = 791.2 pm; I4/mcm, Z = 4), were determined by x-ray methods and refined to wR = 0.038 (2113 reflections) resp. 0.039 (257 reflections). The structures derive from orthorhombic (GdFeO)3 and cubic perovskite type, resp., by Jahn-Teller distortion. The CuF64- octahedra, differently elongated in the two compounds (average NaCuF3: Cu—F = 188.9/197.3/225.6(2) pm; RbCuF3: 188.3/197.8/237.6(3) pm), show the same pattern of antiferrodistortive ordering, but there are bent bridges Cu—F—Cu = 144.2…148.0(1)° in NaCuF3. Structural relations to the prototypes mentioned and to comparably Jahn-Teller distorted copper fluoro compounds are discussed.
    Notes: Die Kristallstrukturen des triklinen NaCuF3 (a = 539,1, b = 555,2, c = 792,8 pm, α = 90,66, β = 92,05, γ = 86,95°; P1, Z = 4) und des tetragonalen, mit KCuF3 isotypen RbCuF3 (a = 602,3, c = 791,2 pm; I4/mcm, Z = 4) wurden röntgenographisch bestimmt und auf wR = 0,038 (2113 Reflexe) bzw. 0,039 (257 Reflexe) verfeinert. Die Strukturen leiten sich vom orthorhombischen (GdFeO3-) bzw. kubischen Perowskit-Typ durch Jahn-Teller-Verzerrung ab. Die in beiden Verbindungen unterschiedlich gestreckten CuF64--Oktaeder (Mittelwert NaCuF3: Cu—F = 188,9/197,3/225,6(2) pm; RbCuF3: 188,3/197,8/237,6(3) pm) sind nach demselben Muster antiferrodistortiv geordnet, jedoch unter Winkelung Cu—F—Cu = 144,2…148,0(1)° in NaCuF3. Strukturelle Beziehungen zu den genannten Prototypen und zu vergleichbar Jahn-Teller-verzerrten Kupfer-Fluorverbindungen werden diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905850112
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  • 2
    Electronic Resource
    Electronic Resource
    Structure of Na2Fe2F7 and structural relations in the family of weberites Na2MIIMIIIF7 (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1909-1919 
    Details
    ISSN: 0044-2313
    Keywords: Sodium iron fluoride ; weberite structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Struktur von Na2Fe2F7 und Strukturbeziehungen in der Weberitfamilie Na2MIIMIIIF7Die gemischtvalente Verbindung Na2Fe2F7 kristallisiert im monoklinen Weberit-Typ von Na2CuFeF7-II (M-II), Raumgruppe C2/c, Z = 16, a = 12,676, b = 7,422, c = 24,710 Å, β = 99,97°. Die Verfeinerung mit F2-Daten ergab wR(F2) = 0,117 für alle 2 645 Reflexe, R = 0,057 für 1 258 Reflexe mit Fo 〉 4σ(F). Auf der Grundlage dieser und anderer neuer Einkristalluntersuchungen werden die Strukturen der Weberite Na2MIIMIIIF7 in vier Haupttypen eingeteilt: O-I ist der „klassische“ orthorhombische Weberit (RG Imma), wie er im Mineral Na2MgAlF7 auftritt, und von dem sich zwei niedriger symmetrische Varianten, O-II (Na2CuCrF7-Typ) und O-III (Na2NiInF7), ableiten. Der zweite M-I und dritte M-II Typ sind monoklin (z. B. Na2CuFeF7-I and -II), der vierte Typ T ist trigonal (Na2MnFeF7). Die strukturellen Verwandtschaften innerhalb der Weberitfamilie werden diskutiert und die Zusammenhänge aufgezeigt, die es erlauben, diese Weberite ebenso wie die Pyrochlore als Subtraktionsabkömmlinge des Fluorittyps zu betrachten.
    Notes: The mixed valence compound Na2Fe2F7 crystallizes in the monoclinic weberite structure of the Na2CuFeF7-II type (M-II), space group C2/c, Z = 16, a = 12.676, b = 7.422, c = 24.710 Å, β = 99.97°. Refinement on F2 led to wR(F2) = 0.117 for all 2 645 reflections, R = 0.057 for 1 258 refl. with Fo 〉 4σ(F). On the basis of this and other recent single crystal investigations the structures of weberites Na2MIIMIIIF7 are classified in four main structure types: O-I is the ‘classical’ orthorhombic weberite type (S.G. Imma) encountered e.g. in the mineral Na2MgAlF7, from which two lower symmetric variants O-II (Na2CuCrF7 type) and O-III (Na2NiInF7) are deriving. The second M-I and third M-II basic type are monoclinic (e. g. Na2CuFeF7-I and -II), the fourth type T is trigonal (Na2MnFeF7). The structural relations within the weberite family are discussed and the connections established, which allow to regard these weberites as well as the pyrochlores as subtraction derivatives of the fluorite type.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936191115
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