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The First Orthotelluric Acid Polysilylesters: Synthesis and Crystal Structure of [(Me 3 SiO) 8 Te 2 O 2 ] and [(Me 4 Si 2 O 2 ) 3 Te]
Author(s) -
Driess M.,
Hänisch C. von,
Merz K.
Publication year - 1999
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/(sici)1521-3749(199903)625:3<493::aid-zaac493>3.0.co;2-p
Subject(s) - chemistry , denticity , ring (chemistry) , octahedron , crystallography , reagent , stereochemistry , nmr spectra database , crystal structure , nuclear magnetic resonance spectroscopy , polymer chemistry , spectral line , organic chemistry , physics , astronomy
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.