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  • Chemistry  (3)
  • Cesium copper(II) fluoride, CsCu2F5
  • IR Spectra
  • Cyano-elpasolites
  • Wiley-Blackwell  (3)
  • 1980-1984  (3)
  • 1975-1979
  • 1981  (1)
  • 1980  (2)
Collection
Keywords
  • Chemistry  (3)
  • Cesium copper(II) fluoride, CsCu2F5
  • IR Spectra
  • Cyano-elpasolites
  • Inorganic Chemistry  (3)
Publisher
  • Wiley-Blackwell  (3)
Years
  • 1980-1984  (3)
  • 1975-1979
Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 467 (1980), S. 187-196 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: X-Ray Studies on Titanium(III) Fluoro Compounds with Pyrochlore-related StructuresThe cubic compounds (a/pm) CsMIITiIIIF6, MII = Mg (1041.6), Ni (1043.9), Zn (1049.8), Co (1051.7), V (1052.6), Fe (1055.3), Mn (1064.9) and CsM0,5ITi1,5IIIF6, MI = K (1074.6), Rb (1080.6) were prepared. They crystallize in the modified pyrochlore structure of the RbNiCrF6 type, which is confirmed once more at single crystals of an oxide fluoride phase CsTi2X6 (X6 between O2F4 and O3F3): Space group Fd3m, a = 1028.8 pm, R = 2.6% (126 independent reflections). Further compounds CsM0,5ITi1,5IIIF6 according to their powder diagrams are orthorhombic (MI = NH4: a = 764.1, b = 767.5, c = 1087.5 pm) or monoclinic (Na: a = 737.0, b = 758.0, c = 1061.8 pm, β = 91.1°, Li: a = 1466, b = 1479, c = 1041 pm, β = 93.3°) with related, but not exactly know structures.
    Notes: Die kubischen verbindungen (a/pm) CsMIITiIIIF6, MII = Mg(1041,6), Ni(1043,9), Zn(1049,8), Co(1051,7), V(1052,6), Fe(1055,3), Mn(1064,9) und CsM0,5ITi1,5IIIF6, MI = K(1074,6), Rb(1080,6) wurden dargestellt. Sie kristallisieren in der modifizierten Pyrochlorstruktur des RbNiCrF6-Types, der an Einkristallen einer Oxidfluoridphase CsTi2X6 (X6 zwischen O2F4 und O3F3) erneut bestätigt wird: Raumgruppe Fd3m, a = 1028,8 pm, R = 2,6% (126 symmetrieunabhängige Reflexe). Weitere Verbindungen CsM0,5ITi1,5IIIF6 sind nach Pulveraufnahmen orthorhombisch (MI = NH4: a = 764,1, b = 767,5, c = 1087,5 pm) bzw. monoklin (Na: a = 737,0, b = 758,0, c = 1061,8 pm, β = 91,1°, Li: a = 1466, b = 1479, c = 1041 pm,β = 93,3°), mit verwandten, aber nicht genauer bekannten Strukturen.
    Additional Material: 5 Tab.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 469 (1980), S. 75-80 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Refinement of the 12L Structure of the Hexagonal-rhombohedral Elpasolite Rb2LiFeF6The single crystal structure determination of the hexagonal Elpasolite Rb2LiFeF6 confirmed (R = 2.4%) the compound to be isotypic to the hexagonal-rhombohedral 12 layer structure of the Cs2NaCrF6 type. The compound crystallizes with a = 588.0(3), c = 2879.0(8) pm (a = 1017.9 pm, α = 33.57°) in space group R3m. The fluorine distances of the two iron atoms differing in distortion of their octahedral coordination are 191.9(3) and 193.6(3) pm, resp. By face-sharing with FeF6 octahedra at one side and edge-sharing at the other, the LiF6 octahedra are strongly deformed, Li—F = 200.8/223.1(13), Li—Fe = 281.0(18) pm. Both rubidium atoms are 12 coordinated, average distance Rb—F = 297.7 pm. The relations of hexagonal-rhombohedral lattice constants to those of a pseudomonoclinic cell, as claimed for some Elpasolites, are pointed out.
    Notes: Die Einkristallstrukturbestimmung an dem hexagonalen Elpasolith Rb2LiFeF6 bestätigte (R = 2,4%) die Isotypie mit der hexagonal-rhomboedrischen 12-Schichtenstruktur des Cs2NaCrF6-Typs. Die Verbindung kristallisiert mit a = 588,0(3), c = 2879,0(8) pm (a = 1017,9 pm, α = 33,57°) in der Raumgruppe R≙m. Die Fluorabstände der beiden mit unterschiedlichem Verzerrungsgrad oktaedrisch koordinierten Eisenatome betragen Fe—F = 191,9(3) bzw. 193,6(3) pm. Durch die Flächenverknüpfung mit FeF6-Oktaedern auf der einen, Eckenverknüpfung auf der anderen Seite sind die LiF6-Oktaeder stark deformiert, Li—F = 200,8/223,1(13), Li—Fe = 281,0(18) pm. Die beiden Rubidiumatome sind 12fach koordiniert, Mittelwert Rb—F = 297,7 pm. Auf die Beziehungen hexagonal-rhomboedrischer Gitterkonstanten zu denen einer pseudomonoklinen Zelle, wie sie für manche Elpasolithe angegeben wurde, wird hingewiesen.
    Additional Material: 2 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 474 (1981), S. 113-122 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: X-Ray Single Crystal Structure Determinations of the Potassium Copper(II) Fluorides K2CuF4 and K3Cu2F7With single crystals of the tetragonal compounds K2CuF4 (a = 414.7(2), c = 1273(3) pm) and K3Cu2F7 (a = 415.6(3), c = 2052(3) pm), showing no superstructure reflections, crystal structure determinations were based on space group I4/mmm of the K2NiF4 and Sr3Ti2O7 type, resp. The shape of F0-Fourier maxima at the positions of linking fluorine atoms within the layers of octahedra suggested disorder of bridging ligands caused by multidomain structure, which could be refined assuming half occupation of higherfold positions. The results confirmed the Jahn-Teller-distortions of octahedra being elongated with a significant orthorhombic component: Cu—F = 190.9(7)/193.9(2)/223.8(7) pm in K2CuF4 (RW = 0.020) and 190.0(7)/194.7/225.6(7) pm in K3Cu2F7 (RW = 0.023). In the acentric octahedra of the latter compound the intermediate distance is averaged from the splitted lengths 192.7(4)/196.8(1) pm of axes along the c direction.
    Notes: Von Einkristallen der tetragonalen Verbindungen K2CuF4 (a = 414,7(2), c = 1273(3) pm) und K3Cu2F7 (a = 415,6(3), c = 2052(3) pm), die röntgenographisch keine Überstrukturreflexe zeigten, wurden die Kristallstrukturen unter Zugrundelegung der Raumgruppe I4/mmm des K2NiF4- bzw. Sr3Ti2O7-Typs bestimmt. Aus den Formen der F0-Fouriermaxima an den Stellen der die Oktaeder zu Schichten verknüpfenden Fluoratome wurde auf Fehlordnung der Brükkenliganden geschlossen, die von einer Multidomänenstruktur herrührt und unter Annahme halbbesetzter höherzähliger Punktlagen verfeinert werden kann. Das Ergebnis bestätigte die Jahn-Teller-Verzerrung zu gestreckten Oktaedern mit signifikanter orthorhombischer Komponente: Cu—F = 190,9(7)/193,9(2)/223,8(7) pm in K2CuF4 (RW = 0,020) und 190,0(7)/194,7/225,6(7) pm in K3Cu2F7 (RW = 0,023). In den azentrischen Oktaedern der letztgenannten Verbindung setzt sich der mittlere Abstand aus entlang der c-Richtung aufgespaltenen Achslängen von 192,7(4)/196,8(1) pm zusammen.
    Additional Material: 3 Ill.
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