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A stable silaborene: synthesis and characterization.

Norio Nakata1, Akira Sekiguchi

  • 1Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Ibaraki, Japan.

Journal of the American Chemical Society
|January 13, 2006
PubMed
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Researchers synthesized a stable silicon-boron doubly bonded compound, silaborene. Structural analysis revealed a short Si-B bond, indicating double bond character, which persisted in its silaborenide derivative.

Area of Science:

  • Organosilicon Chemistry
  • Main Group Chemistry
  • Synthetic Inorganic Chemistry

Background:

  • Silicon-boron compounds are of significant interest due to their unique bonding characteristics.
  • Previous research has explored various Si-B containing molecules, but stable doubly bonded systems remain challenging to synthesize and characterize.
  • Understanding the electronic structure and bonding in Si-B compounds is crucial for advancing inorganic and organometallic chemistry.

Purpose of the Study:

  • To synthesize and characterize a stable silicon-boron doubly bonded compound, silaborene.
  • To investigate the structural and bonding properties of the synthesized silaborene and its derived silaborenide.
  • To provide experimental evidence for the presence of double bond character in Si-B systems.

Main Methods:

Related Experiment Videos

  • Synthesis of silaborene via the reaction of 1,1-dilithiosilane with dichloro(2,2,6,6-tetramethylpiperidino)borane.
  • X-ray crystallographic analysis of the synthesized silaborene to determine its molecular structure and bond lengths.
  • Reaction of silaborene with lithium trimethylsilylacetylide to form a silaborenide.
  • X-ray crystallographic analysis of the silaborenide to study its structural evolution.

Main Results:

  • A stable silicon-boron doubly bonded compound, silaborene (2), was successfully synthesized.
  • X-ray crystallography revealed an almost linear >Si=B-N< framework with a significantly short Si-B bond length (1.8379(17) Å), approximately 10% shorter than typical Si-B single bonds.
  • The silaborene reacted to form a silaborenide (4-.[Li(dme)3]+) with a longer, yet still short, Si-B bond length (1.933(3) Å), indicating retained double bond character.

Conclusions:

  • The synthesized silaborene possesses significant Si=B double bond character, supported by its short bond length and structural geometry.
  • The derived silaborenide also exhibits double bond character, suggesting the stability of the Si=B linkage even upon anion formation.
  • These findings contribute to the understanding of bonding in silicon-boron compounds and open avenues for exploring novel Si-B multiple bond systems.