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  • 2015-2019
  • 1985-1989  (2)
  • 1950-1954
  • 1986  (2)
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  • 2015-2019
  • 1985-1989  (2)
  • 1950-1954
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 534 (1986), S. 93-99 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bis[(tert-butylnitrene)tetrachlorotungsten]: Synthesis, I.R. Spectrum, and Crystal StructureThe title compound, forming red crystals, is prepared by the reaction of tungsten hexachloride with the iminoborane Me3CB≡NCMe3. With PPh4Cl it forms the chloro complex PPh4[WCl5(NCMe3)]. Both complexes are characterized by their i.r. spectra. The crystal structure of [WCl4(NCMe3)]2 was determined by the aid of X-ray diffraction (space group P21/c, Z = 2 dimeric units, 1938 independent, observed reflexions, R = 0.028, a = 636, b = 1537, c = 1124 pm; β 104.74°). The compound forms centrosymmetric molecules in which the tungsten atoms are bridged via chloro atoms with W—Cl bond lengths of 241 and 275 pm. In position trans to the longer WCl bond the nitrene ligand is attached with a WN distance of 170 pm which corresponds to a triple bond; the W≡N—C bond angle is 173°.
    Notes: Die Titelverbindung [WCl4(NCMe3)]2 wird aus Wolframhexachlorid und dem Iminoboran t-BuB≡Nt-Bu in Form roter Kristalle synthetisiert. Mit Tetraphenylphosphoniumchlorid entsteht in CH2Cl2 der Chlorokomplex PPh4[WCl5(N—CMe3)]. Beide Verbindungen werden durch ihre IR-Spektren charakterisiert. Nach der röntgenographischen Strukturbestimmung kristallisiert [WCl4(N—CMe3)]2 monoklin in der Raumgruppe P21/c mit zwei dimeren Formeleinheiten pro Elementarzelle (1938 unabhängige, beobachtete Reflexe, R = 2,8%) und mit den Gitterkonstanten a = 636, b = 1537, c = 1124 pm, β 104,74°. Die Verbindung bildet zentrosymmetrische Moleküle [WCl4(NCMe3)]2, in denen die Wolframatome über Chlorobrücken mit W—Cl-Abständen von 241 und 275 pm verknüpft sind. In trans-Position zum langen WCl-Abstand befindet sich das N-Atom des Nitrenliganden mit einem WN-Abstand von 170 pm, der etwa einer Dreifachbindung entspricht. Der Bindungswinkel W≡N—C beträgt 173°.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 1986-03-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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