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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 311 (1961), S. 281-289 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: K2VF6, Rb2CF6 and Cs2VF6 were prepared; they are light pink-yellowish in colour and stable in dry air. Several modifications occur with all three compounds as a function of the temperature of preparation. With K2VF6 the hexagonal K2MnF6- and the trigonal K2GeF6-type with the lattice constants a = 5,79 Å, c = 9,34 Å and a = 5,67 Å, c = 4,65 Å were observed. Rb2VF6 also crystallizes in these two structure types with a = 5,95 Å, c = 9,58 Å resp. a = 5,88 Å, c = 4,78 Å. With Cs2VF6 the additional type of K2PtCl6 occurs. The lattice constants here are a = 6,28 Å, c = 10,08 Å for the hexagonal type, a = 6,17 Å, c = 4,98 Å for the triagonal type and a = 9,03 Å for the cubic type.The complex compounds of VIII and VIV were examined magnetically. The moments of the VIV-compounds are larger than would be equivalent to the spin-value.
    Notes: K2VF6, Rb2VF6 und Cs2VF6 wurden als hellrosagelbliche, an trockener Luft beständige Verbindungen dargestellt. Bei allen drei Verbindungen treten in Abhängigkeit von der Darstellungstemperatur mehrere Modifikationen auf. Beim K2VF6 wurde der hexagonale K2MnF6-und der trigonale K2GeF6-Typ mit den Gitterkonstanten a = 5,79 Å, c - 9,34 Å und a - 5,67 Å, c = 4,65 Å, beobachtet. Rb2VF6 kristallisiert ebenfalls in diesen beiden Strukturtypen mit a = 5,95 Å, c = 9,58 Å bzw. a = 5,88 Å, c = 4,78Å. Beim Cs2VF6 tritt zusätzlich noch der K2PtCl6-Typ auf. Die Gitterkonstanten sind hier für den hexagonalen Typ a = 6,28 Å, für den trigonalen a = 6,17 Å, c = 4,98 Å und für den kubischen a = 9,03 Å.Die Komplexverbindungen mit VIII und VIV wurden magnetisch untersucht. Die für die VIV-Verbindungen gefundenen Momente sind größer, als dem Spinwert entspricht.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 1961-09-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 3
    Publication Date: 2016-06-07
    Description: A contribution is given to an old problem: the explanation of the generation of aerodynamic lift. Physical models are described which provide a better understanding of the phenomena involved.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center The Sci. and Technol. of Low Speed and Motorless Flight, Pt. 1; p 93-102
    Format: application/pdf
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