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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: Perfluoromethyl Element Ligands. XXVIII. Coordinating Properties of Organoelement Element Ligands R2EE′R and R2EER′2(R, R′ = CH3, CF3; E = P, As; E′ = S, Se, Te)The coordinating properties of organoelement-element compounds of the type R2EE′R and R2EER′2 (R,R′ = CH3, CF3; E = P, As; E′ = S, Se, Te) in VIB metal carbonyls are studied and comprehensively discussed. Results of i.r. and n.m.r. (1H, 19F, 31P, 13C) spectroscopic investigations of fifty M(CO)5L derivatives (M = Cr, Mo, W) support the description of the M—E bond as a combination of σ-donor and π-acceptor effects. Steric influences on the spectroscopic data are not significant in this series of compounds. The donor/acceptor ratio decreases in the order EMe3 〉 Me2EE(CF3)2, Me2EE′CF3 〉 (CF3)2EE′Me 〉 E(CF3)3.
    Notes: Die Koordinationsfähigkeit von Organoelement-Element-Verbindungen des Types R2EE′R und R2EER′2 (R, R′ = CH3, CF3; E = P, As; E′ = S, Se, Te) in Carbonylen der VI B-Metalle wird zusammenfassend diskutiert. Die Ergebnisse IR- und NMR (1H, 19F, 31P, 13C)-spektroskopischer Untersuchungen von fünfzig M(CO)5L-Komplexen (M = Cr, Mo, W) stützen das σ-Donor/π-Akzeptor-Bindungsmodell für die M—E-Verknüpfung. Sterische Einflüsse spielen in dieser Verbindungsreihe nur eine untergeordnete Rolle. Das Verhältnis aus σ-Donor- und π-Akzeptorstärke nimmt in der Reihe EMe3 〉 Me2EE(CF3)2, Me2EE′CF3 〉 (CF3)2EE′Me 〉 E(CF3)3 ab.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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