The First Orthotelluric Acid Polysilylesters: Synthesis and Crystal Structure of [(Me3SiO)8Te2O2] and [(Me4Si2O2)3Te] |
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Authors: | M. Driess,C. von Hä nisch,K. Merz |
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Abstract: | The compounds [(Me3SiO)8Te2O2] ( 1 ) and [(Me4Si2O2)3Te] ( 2 ) have been prepared in good yields through Bronsted acid‐base reaction of Te(OH)6 with Me3SiNEt2 and Me4Si2(NEt2)2, respectively. They have been characterised by multinuclear NMR spectroscopy and single crystal X‐ray diffraction analyses. The formation of dinuclear 1 is the result of fast intermolecular condensation of two partially silylated orthotelluric acid units during the esterification process. Its structure consists of two edge‐fused TeO6‐octahedra, bearing a four‐membered Te2O2 ring as central motif. In contrast, the main structural feature of chiral 2 is a TeO6 octahedron which is fully silylated by three bidentate 1,1,2,2‐tetramethyldisilanediyl units, resulting in a racemic mixture. The metastability of 2 is remarkable since the Te(+ 6) center usually acts as a strong oxidation reagent toward the Si–Si bond in disilanes. 1 and 2 represent potential starting compounds for molecular TexOy aggregates as hybrid components for new glasses by sol‐gel procedure. |
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Keywords: | Tellurium Orthotelluric acid Crystal structure |
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