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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: Nucleophilic Property of the Bulk Anion of the Base Lithium diisopropylamide at the Proton Exchange vs. the Isolobal AuPPh3 Cation in [(μ-H) (μ-PPh2) (CO)8Re2]The proton exchange in the starting material [(μ-H)(μ-PPh2)(CO)8Re2] vs. the isolobal [AuPPh3]+ cation when reacted with the steric expansive base LDA depending on reaction temperature leads to the three-membered metal ring substance [(μ-PPh2)(CO)8Re2(AuPPh3)] or the metallatetrahedron complex [(μ-C-(N i-Prop2)O)(μ-PPh2)(CO)6Re2(AuPPh3)2]. The tetrahedral cluster compound obtained through the nucleophilic property of LDA shows by means of cyclic voltammetry a reversible and a irreversible one-electron transfer redox step. The single crystal X-ray analysis of the compound with a tetrahedral Au2Re2 core gives following values of metal-metal bond lengths: Re—Re 312.2(2) pm, Au—Au 270.9(2) pm, and Au—Re 297.7(2) pm. The acyl diisopropylamido groups bridging the Re—Re bond is planar.
    Notes: Der Protonenaustausch in dem Edukt [(μ-H)(μ-PPh2)(CO)8Re2] gegen die isolobale [AuPPh3]+-Gruppe wird mit der sterisch anspruchsvollen Base Lithiumdiisopropylamid (LDA) temperaturabhängig zu der Metalldreiringverbindung [(μ-PPh2)(CO)8Re2(AuPPh3)] oder der Metallatetrahedran-Clusterverbindung [(μ-C(N i-Prop2)O)(μ- PPh2)(CO)6Re2(AuPPh3)2] geführt. Das durch die nukleophile Wirksamkeit von LDA erzeugte Metallatetrahedran zeigt im Cyclovoltammogramm einen reversiblen und irreversiblen Einelektronen-Redoxschritt. Die Einkristall-Röntgenstrukturanalyse ergibt für die Verbindung mit tetraedrischer Au2Re2-Metallverknüpfungen folgende Werte für die Metall-Metall-Bindungsabstände: Re—Re 312,2(2) pm, Au—Au 270,9(2) pm und Au—Re 297,7(2) pm. Die Re—Re-Bindung wird durch eine planare Acyldiisopropylamido-Gruppe verbrückt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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