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The First Orthotelluric Acid Polysilylesters: Synthesis and Crystal Structure of [(Me3SiO)8Te2O2] and [(Me4Si2O2)3Te]

✍ Scribed by M. Driess; C. von Hänisch; K. Merz

Publisher: John Wiley and Sons
Year: 1999
Tongue: German
Weight: 99 KB
Volume: 625
Category: Article
ISSN: 0372-7874
DOI: 10.1002/(sici)1521-3749(199903)625:3<493::aid-zaac493>3.0.co;2-p

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✦ Synopsis

The compounds [(Me 3 SiO) 8 Te 2 O 2 ] (1) and [(Me 4 Si 2 O 2 ) 3 Te] (2) have been prepared in good yields through Bronsted acid-base reaction of Te(OH) 6 with Me 3 SiNEt 2 and Me 4 Si 2 (NEt 2 ) 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 TeO 6 -octahedra, bearing a four-membered Te 2 O 2 ring as central motif. In contrast, the main structural feature of chiral 2 is a TeO 6 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 Te x O y aggregates as hybrid components for new glasses by sol-gel procedure.

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