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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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Facile access to silicon-functionalized bis-silylene titanium(II) complexes.

Burgert Blom1, Matthias Driess, Daniel Gallego

  • 1Department of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Strasse des 17. Juni 135, Sekr. C2 10623 Berlin, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 12, 2012
PubMed
Summary

Researchers synthesized novel titanium(II) complexes featuring bis-silylene ligands. These unique compounds, including the first hydridosilylene metal complex, offer new avenues in organometallic chemistry and materials science.

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Area of Science:

  • Organometallic Chemistry
  • Silicon Chemistry
  • Coordination Chemistry

Background:

  • Titanium(II) complexes are valuable in catalysis and materials science.
  • Silylene ligands are reactive silicon species with growing importance.
  • The synthesis of bis-silylene metal complexes presents unique challenges.

Purpose of the Study:

  • To synthesize unprecedented bis-silylene titanium(II) complexes.
  • To explore the functionalization of silylene ligands at the silicon(II) center.
  • To investigate the electronic structure and bonding in these novel complexes.

Main Methods:

  • Phosphane elimination strategy for complex synthesis.
  • Salt metathesis reactions for ligand functionalization.
  • Single-crystal X-ray diffraction and DFT calculations for structural and electronic analysis.

Main Results:

  • Successful synthesis of bis-silylene titanium(II) complexes with varying silicon substituents (Cl, CH3, H).
  • Preparation of the first bis-(hydridosilylene) titanium(II) complex.
  • Structural elucidation of key complexes and detailed DFT analysis of Ti-Si bonding.

Conclusions:

  • The phosphane elimination strategy is effective for synthesizing these novel titanium-silylene complexes.
  • The Si-Cl bond in the chlorosilylene complex allows for facile functionalization.
  • DFT calculations reveal delocalized sigma and pi bonding within the Si-Ti-Si framework.