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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 303-310 
    ISSN: 0044-2313
    Keywords: Potassium diamido dioxosilicate ; rubidium diamido dioxosilicate ; cesium diamido dioxosilicate ; crystal structures ; IR spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of Alkali Metal Diamido Dioxosilicates M2SiO2(NH2)2 with M ≙ K, Rb and CsSiO2 - α-quartz - reacts with alkali metal amides MNH2 (M ≙ K, Rb, and Cs) in molar ratios from 1:2 to 1:10 at 450°C ≤ T ≤ 600°C and P(NH3) = 6 kbar in autoclaves to diamidodioxosilicates M[SiO2(NH2)2]. Crystals of the colourless compounds which hydrolyze rapidly were investigated by x-ray methods. Following data characterize the structure determination on the isotypic compounds: The structures of the diamidodioxosilicates are closely related to the β—K2SO4 type. They contain isolated [SiO2(NH2)2]2- ions. K+ ions and hydrogen bridge bonds N—H…O (with 2.68 Å ≤ d(N…O) ≤ 2.78 Å for the K compound) connect the tetrahedral anions.
    Notes: SiO2 - α-Quarz - reagiert mit Alkalimetallamiden MNH2 (M ≙ K, Rb und Cs) im Molverhältnis 1:2 bis 1:10 bei 450°C ≙ T ≙ 600°C und P(NH3) = 6 kbar in Hochdruckautoklaven zu Diamidodioxosilicaten M2SiO2(NH2)2. Kristalle der farblosen, sehr hydrolyseempfindlichen Verbindungen wurden röntgenographisch untersucht. Folgende Daten charakterisieren die Strukturbestimmungen an den isotypen Verbindungen: Die Struktur der Diamidodioxosilicate ist eng verwandt mit dem β-K2SO4-Typ. Es liegen isolierte [SiO2(NH2)2]2--Ionen vor, die durch K+-Ionen und Wasserstoffbrückenbindungen N—H…O (mit 2,68 Å ≤ d(N…O) ≤ 2,78 Å für M ≙ K) verknüpft sind.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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