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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1414-1418 
    ISSN: 0044-2313
    Keywords: Octatelluride, Synthesis, Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: [K(15-Crown-5)2]2Te8 - a Bicyclic PolytellurideThe octatelluride [K(15-crown-5)2]2Te8 has been synthesized by the oxydation of a potassium tritelluride solution in dimethylformamide by iron(III) chloride in the presence of 15-crown-5, forming black crystals, which were characterized by an X-ray structure determination. Space group Pca21, Z = 4, 4 548 observed unique reflections, R = 0.048. Lattice dimensions at -70°C: a = 1 881(1), b = 2 211(2), c = 1 530(1) pm. The structure consists of cations [K(15-crown-5)2]+, in which the potassium ions are sandwichlike coordinated by the oxygen atoms of the two disordered crown ether molecules, and of bicyclic Te82- ions. In these anions a Te2+ ion is chelated in a planar fashion by a Te32- and a Te42- unit.
    Notes: Das Octatellurid [K(15-Krone-5)2]2 Te8 entsteht durch Oxydation einer Kaliumtritelluridlösung in Dimethylformamid durch Eisen(III)-chlorid in Gegenwart von 15-Krone-5 als schwarze Kristalle, die wir durch eine röntgenographische Strukturanalyse charakterisiert haben. Raumgruppe Pca21, Z = 4, 4 548 beobachtete unabhängige Reflexe, R = 0,048. Gitterabmessungen bei -70°C: a = 1 881(1), b = 2 211(2), c = 1 530(1) pm. Die Struktur besteht aus Kationen [K(15-Krone-5)2]+, in denen die Kaliumionen sandwichartig von den O-Atomen der fehlgeordneten Kronenethermoleküle umgeben sind, und aus bicyclischen Te82--Ionen. In ihnen ist ein Te2+-Ion planar von je zwei Te-Atomen eines Te32-- und eines Te42--Ions chelatartig umgeben.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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