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  • Chemistry  (3)
  • IR Spectra
  • Cyano-elpasolites
  • 1975-1979  (3)
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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: High Pressure Syntheses and Transformations of Hexagonal Elpasolithes A2IBIMIIIF6Hexagonal-rhombohedrally in the structure type of Cs2NaCrF6 crystallizing elpasolithes Rb2LiMF6 and Cs2NaMF6 (MIII = Al, Ga, V, Cr, Fe) were transformed to cubic modifications (K2NaAlF6 type) by high pressure application (15-100 kbar). In addition intermediate high pressure phases with the hexagonal structure of high temperature K2LiAlF6 could be obtained in some cases. The lattice constants of these compounds are reported, as well as those of hexagonal elpasolithes Tl2LiMF6 and Cs2LiMF6 which only form, if they are synthesized under pressure. The results are discussed in connection with the Goldschmidt tolerance factor t′ = √2(rA + rF)/(rB + rM + 2rF) of the elpasolithes mentioned.
    Notes: Von hexagonal-rhomboedrisch im Cs2NaCrF6-Typ kristallisierenden Elpasolithen Rb2LiMF6 und Cs2NaMF6 (MIII = Al, Ga, V, Cr, Fe) konnten durch Hochdruckanwendung (15-100 kbar) kubische Modifikationen (K2NaAlF6-Typ) erhalten werden. Als intermediäre Hochdruckphasen ließen sich in einigen Fällen außerdem Modifikationen mit der hexagonalen Struktur von Hochtemperatur-K2LiAlF6 fassen. Die Gitterkonstanten dieser Verbindungen werden mitgeteilt, ebenso wie diejenigen neuer hexagonaler Elpasolithe Tl2LiMF6 und Cs2LiMF6, die sich nur bilden, wenn die Synthese unter Druck erfolgt. Die Ergebnisse werden im Zusammenhang mit dem Goldschmidtschen Toleranzfaktor t′ = √2(rA + rF)/(rB + rM + 2rF) der genannten Elpasolithe diskutiert.
    Additional Material: 6 Ill.
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structures of Cesium-containing Fluorides. V. Pseudohexagonal Tungsten Bronze Structure of the Monoclinic Phase Cs0.4Zn0.4Fe1.6F6 and Related Cesium Transition Metal FluoridesThe crystal structure of the pseudohexagonale phase Cs0.4Zn0.4Fe1.6F6 was refined in the monoclinic space group P21 (a = 747.4, b = 763.6, c = 746.1 pm, β = 120.0°, z = 3). Using 1067 single crystal reflections R = 6.3% was reached. Compared to the hexagonal tungsten bronze structure the corner-sharing of octahedra shows pronounced angles also along the unique axis (M—F—M = 159.0°). The average bridge angle in the framework of tilted octahedra is 149.6°. Structural relations are discussed.
    Notes: Die Kristallstruktur der pseudohexagonalen Phase Cs0,4Zn0,4Fe1,6F6 konnte in der monoklinen Raumgruppe P21 (a = 747,4 b = 763,6, c = 746,1 pm, β = 120,0°, z = 3) unter Auswertung von 1 067 Einkristallreflexen auf R = 6,3% verfeinert werden. Im Vergleich zur Struktur der hexagonalen Wolframbronzen ist die Oktaeder-Eckenverknüpfung auch längs der ausgezeichneten Achse deutlich gewinkelt (M—F—M = 159,0°). Der mittlere Brückenwinkel im Raumnetz der verkippten Oktaeder beträgt 149,6°. Die Strukturverhältnisse werden diskutiert.
    Additional Material: 3 Ill.
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  • 3
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structures of Fluorides with Caesium. IV. The Crystal Structure of CsCrF4 - a Novel Tetra-fluorometallate Type with Chain StructureThe crystal structure of the hexagonal compound CsCrF4, crystallizing in space group P62m-D3h3, was determined: a =9.650(5), c = 3.857(3) Å, z = 3, R = 0.023 for 220 symmetrically independent reflections hkl. CsCrF4 is a new type of chain structure, containing three chains of octahedra sharing trans corners along [001] and connected by cis corners to form a triple chain. The bridging angles are Cr—F—Cr = 177.9° and 149.3°, the corresponding distances Cr—F = 1.929 and 1.940 Å, resp., compared to 1.851 Å for the terminal ligands. The results are discussed and relations to other structures shown.
    Notes: Die Kristallstruktur der hexagonal in der Raumgruppe P62,-D3h3 krikristallisierenden Verbindung CsCrF4 wurde bestimmt: a = 9,650(5), c = 3,857(3) Å, V = 311,1 Å3, z = 3, R = 0,023 für 220 symmetrieunabhängige Reflexe hkl. CsCrF4 stellt eine neuen Typ von Kettenstruktur dar, in dem drei längs [001] über trans-Ecken verknüpfte Oktaederketten miteinander über cis-Ecken zu einem Dreierstrang verbunden sind. Die Brückenwinkel betragen Cr—F—Cr 177,9° bzw. 149,3°, die entsprechenden Abstände Cr—F = 1,929 bzw. 1,940 Ä, gegenüber 1,851 Å für die terminalen Liganden. Die Ergebnisse werden diskutiert und Beziehungen zu anderen Strukturen aufgezeigt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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