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Binary Si/N-[4.4]-Spirocycles with Two SiH(2)SiH(2) Loops.

Marcus Söldner1, Annette Schier, Hubert Schmidbaur

  • 1Anorganisch-chemisches Institut der Technischen Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany.

Inorganic Chemistry
|October 24, 2001
PubMed
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New tetra(alkylamino)silanes and spirocyclic silicon compounds were synthesized. These silicon-rich molecules serve as precursors for silicon nitride and silazane materials.

Area of Science:

  • Organosilicon Chemistry
  • Materials Science

Background:

  • Tetra(alkylamino)silanes (Si(NHR)4) are versatile precursors in silicon-based materials synthesis.
  • Improved synthetic methods are crucial for accessing novel silicon compounds with tailored properties.

Purpose of the Study:

  • To synthesize and characterize novel tetra(alkylamino)silanes and their derived spirocyclic and monocyclic compounds.
  • To investigate the structural properties of these silicon-nitrogen compounds.
  • To evaluate their potential as precursors for silicon nitride and silazane materials.

Main Methods:

  • Improved synthesis of tetra(alkylamino)silanes (1a-d).
  • Reaction of silanes with triflate-functionalized disilanes to form spirocyclic compounds (2a-d).
  • Structural characterization using X-ray diffraction, NMR spectroscopy, and mass spectrometry.

Related Experiment Videos

  • Analysis of pyrolytic decomposition pathways.

    • Main Results:

    • Successful synthesis of tetra(alkylamino)silanes (1a-d) and spirocyclic compounds (2a-c) in good yields.
    • Detailed structural analysis of spirocyclic compound 2a and silylammonium salt 3.
    • Identification of steric hindrance effects influencing product distribution with isopropyl-substituted silanes.
    • Synthesis of a monocyclic compound (4) from isopropyl-substituted silanes.

    Conclusions:

    • Tetra(alkylamino)silanes and their spirocyclic derivatives are promising precursors for silicon nitride production.
    • The structural diversity of these compounds allows for controlled synthesis of silazane networks and gels.
    • Further research into their thermal decomposition is warranted for materials applications.