Zur Nucleophilie des sterisch anspruchsvollen Basenanions von Lithiumdiisopropylamid beim Protonenersatz gegen das isolobale AuPPh3-Kation in [(μ-H)(μ-PPh2) (CO)8Re2] |
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Authors: | H.-J. Haupt,C. Heinekamp,U. Fl rke |
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Affiliation: | H.-J. Haupt,C. Heinekamp,U. Flörke |
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Abstract: | 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. |
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