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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Über die Umsetzung der Di- und Tetrafluoride des Xenons mit Fluoriden der AlkalimetalleDie Umsetzung von XeF2 und XeF4 mit Verbindungen des Typs MF (M = Na, K, Rb, Cs) wird untersucht. Es bilden sich dabei Hexafluoroxenate(IV) mit der Summenformel M2XeF6, die das oktaedrische Anion XeF62- enthalten. Cs2XeF6 und Rb2XeF6 bilden monokline Kristalle (a0 = 853,7(5); b0 = 669,6(2); c0 = 843,6(5) pm; β = 121,7(1)° für Cs2XeF6 und a0 = 812,6(4); b0 = 631,9(2); c0 = 795,6(4) pm; β = 121,5(1)° für Rb2XeF6). K2XeF6: tetragonal mit a0 = 868,8(2); c0 = 747,8(2) pm; Na2XeF6: hexagonal mit a0 = 642,1(3); c0 = 844,8(5) pm. Es wird gezeigt, daß sich die Verbindungen M2XeF6 inkongruent in wasserfreiem HF lösen, wobei sich unter anderem das Solvolyseprodukt XeF4 bildet. Es wird nachgewiesen, daß die Thermolyse von M2XeIVF6 und M2XeVIF8 unter ähnlichen Bedingungen abläuft.
    Notes: Interaction of XeF2 or XeF4 with MF (M = Na, K, Rb, Cs) has been studied. Hexafluoroxenates(IV) M2XeF6 containing the octahedral XeF62- anion (in accordance with spectroscopy data) were formed in the reaction. Cs2XeF6 and Rb2XeF6 form monoclynic crystals (a0 = 853.7(5); b0 = 669.6(2); c0 = 843.6(5) pm; β = 121.7(1)° and a0 = 812.6(4); b0 = 631.9(2); c0 = 795.6(4) pm; β = 121.5(1)°, respectively). K2XeF6 has a tetragonal lattice (a0 = 868.8(2); c0 = 747.8(2) pm), while Na2XeF6 has a hexagonal one (a0 = 642.1(3); c0 = 844.8(5) pm). M2XeF6 is shown to dissolve in unhydrous HF incongruently, one of the solvolitic products being XeF4. Thermolysis of M2XeIVF6 and M2XeVIF8 were shown to proceed under similar temperatures.
    Additional Material: 4 Ill.
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese und Eigenschaften der fünfwertigen Antimon- und BismutfluorideEinige Eigenschaften der SbV- und BiV-fluoride, speziell die Systeme MIIF2-MvF5 (Mv = Sb, Bi; MII = Mg, Ca, Sr, Ba) und HalF3-BiF5 (Hal = Cl, Br) wurden untersucht. Es bilden sich nur Verbindungen der Zusammensetzung MII(MvF6)2 bzw. HalF2[BiF6], die in ihren Kristallgittern oktaedrische Anionen MvF6- enthalten. Die bezüglich BiF5 stärkere Lewissäure SbF5 keine Polyfluoride vom Typ M2vFII- und andere. Die Temperaturabhängigkeit und die chemische Umwandlung des fünfwertigen Antimon- und Bismutfluorids wurden untersucht.
    Notes: Properties of Sbv and Biv fluorides and MIIF2-MvF5 (Mv = Sb, Bi; MII = Mg, Ca, Sr, Ba), HalF3-BiF5 (Hal = Cl, Br) systems have been studied. Only MII(MvF6)2 and HalF2[BiF6] are shown to be formed in these systems. MII(MvF6)2 and HalF2[BiF6] contain MvF6-octahedra in their crystal lattices. SbF5 is found to be a stronger Lewis acid than BiF5 and to be capable to substitute the latter in its fluoro complexes. BiF5, in contrast to SbF5, does not form polyfluoro anions (e.g.M2vF11-etc.). The thermal stability of Sbv and Biv fluorides and their transformations at high temperature were studied.
    Additional Material: 1 Ill.
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