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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: N-chloralkyl-nitridochloro Complexes of Molybdenum (VI). [Cl5Mo≡N-R]- with R = CCl3, C2Cl5. Crystal Structure of (AsPh4)2[(MoOCl4)2CH3CN]In the reaction of tetraphenyl arsonium chloride with the complexes Cl3PO—(Cl4)-Mo≡N—R (R=CCl3, C2Cl5) the POCl3 is displaced by chloride and yields [Cl5Mo≡N—R] -. From the i.r. spectra a structure with six-coordinated molybdenum and a Mo≡N triple bond can be deduced. By reaction with water in acetonitrile the molybdenum is reduced to Mo(V) and the nitride ligand is removed yielding (AsPh4)2[(MoOCl4)2CH3CN]. The crystal structure of this compund was determined with X-ray diffraction data. In the tetragonal structure (space group P4/n) AsPh4+ cations and two different anions were found: square pyramidal [MoOCl4]- and [MoOCl4 · NCCH3]- in which the nitrile is bonded in trans position to the oxygen. The short Mo—O distances of 165 pm indicate a strong π-bonding.
    Notes: Die mit POCl3 Solvatisierten N-chloralkylierten Nitride Cl3PO—(Cl4)-Mo≡N—R (R = CCl3 C2Cl5) reagieren mit Tetraphenylarsonuiumchlorid unter Ablösung des POCl3 zu den entsprechenden Chlorokomplexen [Cl5Mo≡N—R] - Nach den IR-Spektren ist das Molybdän sechsfach koordiniert mit einer Mo≡N. Dreifachbindung (lokale Symmetrie C4v). Mit Wasser läßt sich in Acetonitril der Nitridligand ablösen, wobei unter Reduktion zum Mo(V) die Verbindung (AsPh4)2[(MoOCl4)2CH3CN]. entsteht, deren Kristallstruktur mit Hilfe von Röntgenbeugungsdaten bestimmt wurde. Sie kristallisiert tetragonal in der Raumgruppe P4/n. In der Struktur liegen AsPh4+-Kationen und zwei verschiedene Anionen Vor: das quadratisch-pyramidale [MoOCl4]- und das [MoOCI4 · NCCH 3]-, in welchem das Nitril trans-ständig zum sauerstoff gebunden ist. Die kurzen Mo-O-Abstände von 165 pm weisen auf eine starke π-Bindung.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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