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  • 1980-1984  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 467 (1980), S. 149-157 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on Na2S3In the literature the existence of Na2S3 is contested, but by reaction of the elements in liquid ammonia under pressure it can be obtained. For reaction temperatures of 300-320 K and a pressure of 2000 bar a compound Na2S3 · NH3 yields. X-ray single crystal investigations are carried out and lead to a structure containing bent S32- polyanions as characteristic feature. The cell constants are as follows: a = 9.257(5) Å, b = 7.056(2) Å, c = 8.919(3) Å, β = 102.71(4)°. The space group is C2/m. The substance decomposes at 510K.
    Notes: Es wird über die Darstellung der Verbindung Na2S3 mit Hilfe der Synthese aus den Elementen in flüssigem Ammoniak unter erhöhtem Druck (Ammonothermalsynthese) berichtet. Die Reaktion führt bei 300-320 K und 2000 bar zu einem Ammoniakat Na2S3 · NH3. Die Struktur wird anhand röntgenographischer Einkristalluntersuchungen bestimmt. Die Substanz zerfällt bei höheren Temperaturen in β-Na2S2 und Na2S4.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 461 (1980), S. 13-21 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of the Dialkali Metal Trichalcogenides Rb2S3, Rb2Se3, Cs2S3, and Cs2Se3Crystalline products were obtained by the reaction of the pure alkali metals with the chalcogens in the molar ratio 2:3 in liquid ammonia at pressures up to 3000 bar and temperatures around 600 K. The substances crystallize in the K2S3 type structure (space group Cmc21(NO. 36)). Unit cell constants see „Inhaltsübersicht“.The characteristic feature of this structure are bent polyanions X32-:(X = S,Se). The new described compounds are compared with the other known alkali metal trichalcogenides.
    Notes: Man erhält die Substanzen in kristallinerform durch Umsetzung der reinen Alkalimetalle mit den Chalkogenen in flüssigem Ammoniak im Molverhältnis 2:3 bei Drucken bis zu 3000 bar und Temperaturen um 600 K. Sie kristallisieren alle im K2S3-Typ (Raumgruppe Cmc21 (Nr. 36)). Ihre Gitterkonstanten lauten: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm Rb}_2 {\rm S}_3 :} & {{\rm a} = 751,3\left(2 \right){\rm pm},} & {{\rm b} = 1037,5\left(2 \right)\,{\rm pm},} & {{\rm c} = 776,9\left(1 \right)\,\,{\rm pm}} \\ {{\rm Rb}_2 {\rm Se}_3 :} & {{\rm a} = 785,6\left(1 \right){\rm pm},} & {{\rm b} = 1085,8\left(2 \right)\,{\rm pm},} & {{\rm c} = 777,9\left(1 \right)\,\,{\rm pm}} \\ {{\rm Cs}_2 {\rm S}_3 :} & {{\rm a} = 771,3\left(3 \right){\rm pm},} & {{\rm b} = 1093,9\left(4 \right)\,{\rm pm},} & {{\rm c} = 811,1\left(3 \right)\,\,{\rm pm}} \\ {{\rm Cs}_2 {\rm S}_3 :} & {{\rm a} = 801,5\left(3 \right){\rm pm},} & {{\rm b} = 1140,6\left(4 \right)\,{\rm pm},} & {{\rm c} = 828,2\left(2 \right)\,\,{\rm pm}} \\\end{array} $$\end{document}Das charakteristische Merkmal der Struktur sind die gewinkelten Chalkogenid-Polyanionen X32-. Die neu beschriebenen Verbindungen werden mit den anderen bis jetzt bekannten Dialkalimetall-trichalkogeniden verglichen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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