The Intriguing Structural Characteristics of the Heterosiloxane Molecule Na4[Sb2O(OSiMe3)8]

Michael Baier, Peter Bissinger, Janet Blümel, Hubert Schmidbaur

Research output: Contribution to journalArticlepeer-review

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Treatment of Sb(OSiMe3)3 with NaOSiMe3 in the molar ratio 1:2 in hexane at ambient temperature leads to the formation of Me3SiOSiMe3 and a crystalline complex of the formula Na4[Sb2O(OSiMe3)8] in ca. 35% yield. The composition of the product has been confirmed by elemental analysis and negative‐ion CI mass spectrometry. The single crystal X‐ray structure analysis (rhombohedral, space group R\documentclass{article}\pagestyle{empty}\begin{document}$\bar{3}$\end{document}c, Z6) resulted in a disorder model for the complex with pseudo‐cubic symmetry owing to virtually random distribution of sodium and antimony atoms over the vertices of an oxygen‐centered octahedron with the eight silyloxy groups capping the faces. Low solubility in non‐coordinating solvents prevented solution NMR studies, but solid‐state NMR investigations using cross polarization and magic‐angle spinning techniques (13C, 29Si) allowed the assignment of a point group C2v structure with the SbIII atoms in cis position relative to the oxo center of the complex.

Original languageEnglish
Pages (from-to)947-950
Number of pages4
JournalChemische Berichte
Issue number4
StatePublished - Apr 1993
Externally publishedYes


  • Antimonites(III), silyl‐, oxo‐
  • Heterosiloxanes
  • NMR, solid‐state
  • Stibinosiloxanes


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