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Dative Bonding between Group 13 Elements Using a Boron-Centered Lewis Base.

Holger Braunschweig1, Rian D Dewhurst2, Leanne Pentecost3

  • 1Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg (Germany) http://www-anorganik.chemie.uni-wuerzburg.de/Braunschweig/. h.braunschweig@uni-wuerzburg.de.

Angewandte Chemie (International Ed. in English)
|January 16, 2016
PubMed
Summary
This summary is machine-generated.

Researchers created novel Lewis adducts using an electron-rich boron compound as a Lewis base. Different Lewis acids selectively bonded to either the boron or nitrogen atom, forming unique noncluster structures.

Keywords:
Lewis adductsalanesborondative bondinggallanes

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Area of Science:

  • Inorganic Chemistry
  • Organoboron Chemistry
  • Lewis Acid-Base Chemistry

Background:

  • Electron-rich monovalent boron compounds offer unique Lewis basicity.
  • Understanding Lewis acid-base interactions is crucial for synthesizing novel compounds.
  • Group 13 elements exhibit diverse Lewis acidic properties.

Purpose of the Study:

  • To synthesize and characterize Lewis adducts using a novel electron-rich monovalent boron compound as a Lewis base.
  • To investigate the selective binding behavior of different Group 13 Lewis acids with the bifunctional boron-based Lewis base.
  • To explore the formation of noncluster Lewis adducts involving boron-centered Lewis bases.

Main Methods:

  • Synthesis of an electron-rich monovalent boron compound.
  • Reaction of the boron compound with various Group 13 Lewis acids (AlCl3, GaCl3, GaBr3, GaI3).
  • Characterization of the resulting adducts using spectroscopic and analytical techniques.

Main Results:

  • The electron-rich monovalent boron compound acted as a Lewis base, forming adducts with Group 13 Lewis acids.
  • The hard Lewis acid aluminum chloride (AlCl3) selectively coordinated to the nitrogen atom of the boron compound.
  • Softer Lewis acids, gallium halides (GaX3), preferentially bonded to the boron atom of the Lewis base.
  • The gallium adducts represent the first reported noncluster Lewis adducts between a boron-centered Lewis base and a main-group Lewis acid.

Conclusions:

  • The study demonstrates the versatile Lewis basicity of electron-rich monovalent boron compounds.
  • Selective adduct formation is achievable by tuning the hardness/softness of the Lewis acid.
  • This work expands the scope of Lewis adduct chemistry and provides new avenues for organoboron compound synthesis.