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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 520 (1985), S. 25-31 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of SMe3⊕ [MoBr4(SMe2)2]⊖.The title compound is obtained from MoBr4 and excess dimethyl sulfide, forming red crystals which are only slightly sensitive to moisture. Whereas the intermediately formed adduct of MoBr4 and SMe2 is unstable, the stable adduct [Mo(NO)2Br2(SMe2)2] can be prepared from Mo(NO)2Br2 and SMe2. According to the structural analysis by X-ray methods, SMe3 ⊕[MoBr4(SMe2)2]⊖ crystallizes orthorhombic in the space group Imma with eight formula units per unit cell, the cell dimensions being a = 1578, b = 2820, c = 856 pm (1303 observed, independent reflexions). The compound consists of S(CH3)3⊕ cations with S—C bond lengths of 180 pm and C—S—C bond angles of 102° and 103° resp., and anions [MoBr4(SMe2)2]⊖. The molybdenum atom is coordinated octahedral by four bromine atoms in equatorial positions and the two S atomes of the SMe2 donor molecules in axial sites with Mo—S bond lengths of 254 pm.
    Notes: Die Titelverbindung entsteht in Form roter, nur wenig feuchtigkeitsempfindlicher Kristalle aus MoBr4 und überschüssigem Dimethylsulfid. Im Gegensatz zu dem heirbei primär gebildeten, unbeständigen Addukt von MoBr4mit SMe2 läßt sich aus Mo(NO)2Br2 und Sme2 das stabile Addukt [Mo(NO)2Br2(SMe2)2] darstellen. SMe3⊕[MoBr4(SMe2)2]⊖ kristallisiert nach der röntgenographischen Strukturbestimmung orthorhombisch in der Raumgruppe Imma mit acht Formeleinheiten pro Elementarzelle und mit den Gitterkonstanten a = 1578, b = 2820, c = 856 pm (1303 unabhängige, beobachtete Reflexe, Rw = 4,2%). Die Verbindung besteht aus S(CH3)3⊕-Kationen mit S—C-Bindungsabständen von 180 pm und Bindungswinkeln C—S—C vin 102° bzw. 103°; sowie Anionen [MoBr4(SMe2)2]⊖. In diesen ist das Molybdänatom äquatorial von vier Bromatomen und axial von zwei S-Atomen der Beiden SMe2-Donormoleküle mit Mo—S-Abständen von 254 pm oktaedrisch umgeben.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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