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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 582 (1990), S. 7-14 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fluoroderivatives of Diphenylacetylene Complexes of Tungsten. Crystal Structure of [Na-15-crown-5] [WF5(PhC≡CPh)]The reactions of [WCl4(PhC≡CPh)]2 with lithium fluoride, sodium fluoride, and potassium fluoride in acetonitrile suspensions lead in presence of the corresponding crown ethers to the complexes [Li-12-crown-4][WFCl4(PhC≡CPh)] (1), [Na-15-crown-5][WF5(PhC≡CPh)] (2), and [K-18-crown-6][WF5(PhC≡CPh)] (3), respectively. The compounds form orange-yellow crystal powders, soluble in acetonitrile, and only sparingly moisture sensitive. 1-3 are characterized by IR spectroscopy, 2 also by its 13C-nmr spectrum. The crystal structure of 2 was solved by X-ray methods. Space group P212121, Z = 4, 4555 observed unique reflexions, R = 0.039. Lattice dimensions at 20°C: a = b = 1403.4(2); c = 1335.6(2) pm. [Na-15-crown-5][WF5(PhC≡CPh)] forms ion pairs via two Na—F contacts with bond lengths of 226.0 and 257.4 pm; thus the sodium ion being sevenfold coordinated by the five oxygen atoms of the crown ether molecule and by two fluorine ligands. The diphenylacetylene ligand is side on bonded to the tungsten atom of the [WF5(PhC≡CPh)]- unit with W—C bond lengths of 202.9 and 204.9 pm, respectively, corresponding to a metallacyclopropene structure.
    Notes: Die Reaktionen von [WCl4(PhC≡CPh)]2 mit Lithiumfluorid, Natriumfluorid bzw. Kaliumfluorid führen in Acetonitrilsuspensionen in Gegenwart der entsprechenden Kronenether zu den Komplexen [Li-12-Krone-4][WFCl4(PhC≡CPh)] (1), [Na-15-Krone-5][WF5(PhC≡CPh)] (2), bzw. [K-18-Krone-6][WF5(PhC≡CPh)] (3). Die Verbindungen bilden gelborange diamagnetische Kristallpulver, die in Acetonitril leicht löslich, im trockenen Zustand nur wenig feuchtigkeitsempfindlich sind. Von 1 bis 3 werden die IR-Spektren mitgeteilt, von 2 auch das 13C-Kernresonanzspektrum. Von 2 wurde auch eine röntgenographische Strukturanalyse ausgeführt. Raumgruppe P212121, Z = 4, 4555 unabhängige beobachtete Reflexe, R = 3,9%. Die Gitterabmessungen betragen bei 20°C: a = b = 1403,4(2); c = 1335,6(2) pm. [Na-15-Krone-5][WF5(PhC≡CPh)] bildet Ionenpaare, in denen die durch die Kronenethermoleküle komplexierten Na+-Ionen mit zwei F-Atomen des Anions [WF5(PhC≡CPh)]- Kontakte mit Na—F-Abständen von 226,0 bzw. 257,4 pm ausbilden. Der Diphenylacetylenligand ist entsprechend einer Metallacyclopropengruppe seitlich an das Wolframatom mit W—C-Abständen von 202,9 bzw. 204,9 pm gebunden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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