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Tridentate Lewis-acids based on triphenylsilane.

Janek Tomaschautzky1, Beate Neumann1, Hans-Georg Stammler1

  • 1Inorganic and Structural Chemistry, Centre for Molecular Materials CM2, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, 33615 Bielefeld, Germany. mitzel@uni-bielefeld.de.

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Summary

Researchers synthesized novel propeller-shaped ortho-substituted triphenylsilanes with metal/silicon acceptor groups. These Lewis-acidic molecules explore host-guest chemistry and include new bismasilatriptycene structures.

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Area of Science:

  • Organosilicon Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Triphenylsilanes with ortho-substituents offer unique three-dimensional structures.
  • Lewis-acidic molecules are crucial for catalysis and host-guest complexation.
  • Developing novel molecular architectures is key to advancing supramolecular chemistry.

Purpose of the Study:

  • To synthesize and characterize new ortho-substituted triphenylsilane derivatives.
  • To explore the host-guest binding capabilities of these novel Lewis-acidic molecules.
  • To investigate the structural properties of bismasilatriptycenes.

Main Methods:

  • Synthesis of triphenylsilane derivatives from halogenated precursors.
  • Development of an improved protocol for synthesizing tris(2-lithiophenyl)silanes.
  • Host-guest complexation studies with alane-functionalized silanes and Lewis-basic guests.
  • X-ray crystallography for molecular structure determination.

Main Results:

  • Successful synthesis of diverse propeller-shaped ortho-substituted triphenylsilanes with varied acceptor groups.
  • An improved method for generating donor-free tris(2-lithiophenyl)silanes was established.
  • Initial host-guest binding studies demonstrated interactions between functionalized silanes and guests.
  • The first molecular structure of a bismasilatriptycene was determined in the crystalline state.

Conclusions:

  • The reported silane derivatives represent a versatile platform for Lewis-acidic applications.
  • The study provides insights into the design of molecules for host-guest chemistry.
  • The successful synthesis and characterization of bismasilatriptycenes expand the scope of organosilicon architectures.