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Mohammad Aghazadeh Meshgi1, Judith Baumgartner1, Christoph Marschner1

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Researchers synthesized oligosilanes with silatranyl groups, observing a unique silicon-nitrogen interaction. This interaction can be reversibly switched off through chemical modifications, offering new possibilities in silicon chemistry.

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Area of Science:

  • Organosilicon Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Oligosilanes are silicon-based compounds with diverse applications.
  • Silatrane structures are known for their unique cage-like framework and potential for intramolecular interactions.
  • Understanding Si-N interactions is crucial for designing novel silicon-containing materials.

Purpose of the Study:

  • To synthesize novel oligosilanes functionalized with silatranyl units.
  • To investigate the presence and nature of silicon-nitrogen (Si-N) interactions in these compounds.
  • To explore methods for controlling or switching off the observed Si-N interaction.

Main Methods:

  • Synthesis of oligosilanes via reactions of potassium oligosilanides with silatranyl triflate.
  • Characterization using 29Si Nuclear Magnetic Resonance (NMR) spectroscopy to detect Si-N interactions.
  • Solid-state structure analysis through X-ray crystallography to determine Si-N bond distances.

Main Results:

  • Successful synthesis of oligosilanes bearing silatranyl moieties.
  • Observation of significant Si-N interaction, evidenced by upfield-shifted SiO3 resonances in 29Si NMR spectra.
  • Crystallographic data confirmed short Si-N distances (2.16–2.29 Å), indicative of strong interaction.
  • Demonstration that Si-N interaction can be deactivated by protonating the nitrogen lone pair or via cleavage of trimethylsilyl groups.

Conclusions:

  • Novel oligosilanes with tunable Si-N interactions have been synthesized.
  • The observed Si-N interaction is strong but can be reversibly modulated.
  • This work provides insights into the control of intramolecular interactions in organosilicon compounds.