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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 975-978 
    ISSN: 0044-2313
    Keywords: Potassium germanium auride ; synthesis ; single crystals ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: K4Au7Ge2: a Framework Structure with Au7-Double-Tetrahedra and Ge2-Dumb-BellsBlack lustrous, brittle single crystals of a hitherto unknown K4Au7Ge2 were synthesized by the reaction of KN3, germanium- and gold-powder at 550°C. The structure was determined from X-ray single-crystal diffractometry data: space group R3m, Z = 3, a = 6.411(3) Å, c = 27.912(20) Å, R/Rw(w = 1) = 0.046/0.056, Z(Fº2) ≥ 3σ(Fº2) = 302 and N(var.) = 18.K4Au7Ge2 crystallizes in a substitution variant of the MgCu2-type. Gold and germanium form a framework structure that consists of corner-sharing Au7-double-tetrahedra and Ge2-dumb-bells. The potassium atoms occupy channel-like cavities within the gold germanium partial structure.
    Notes: Schwarz glänzende, spröde Einkristalle eines bislang unbekannten K4Au7Ge2 wurden durch Umsetzung von KN3, Germanium- und Goldpulver bei 550°C synthetisiert. Die Struktur wurde aus Röntgen-Einkristall-Diffraktometerdaten bestimmt:Raumgruppe R3m, Z = 3, a = 6,411(3) Å, c = 27,912(20) Å, R/Rw(w = 1) = 0,046/0,056, Z(Fº2 ≥ 3σFº2) = 302 und Z(Var.) = 18.K4Au7Ge2 kristallisiert in einer Substitutionsvariante des MgCu2-Typs. Gold und Germanium bilden eine Gerüststruktur, die aus spitzenverknüpften Au7-Doppeltetraedern und Ge2-Hanteln besteht. Die Kaliumatome besetzen kanalartige Hohlräume innerhalb der Au—Ge-Teilstruktur.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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