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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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A unifying bonding concept for metal hydrosilane complexes.

Wolfgang Scherer1, Petra Meixner, José Enrique Barquera-Lozada

  • 1Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany. wolfgang.scherer@physik.uni-augsburg.de

Angewandte Chemie (International Ed. in English)
|April 26, 2013
PubMed
Summary
This summary is machine-generated.

Titanium-silane complexes [Cp2Ti(PMe3)SiH2Ph2] and [Cp2Ti(PMe3)SiHCl3] exhibit similar electronic structures. Researchers found no hypervalent interaction in the second complex, guiding future studies on metal-silane bond activation.

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Area of Science:

  • Organometallic Chemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Transition metal complexes with hydrosilane ligands are crucial in catalysis.
  • Understanding the electronic structure of these complexes is key to controlling their reactivity.
  • Hypervalent interactions in silicon-containing compounds can influence bonding and reactivity.

Purpose of the Study:

  • To investigate and compare the electronic structures of two titanium-hydrosilane complexes: [Cp2Ti(PMe3)SiH2Ph2] (1) and [Cp2Ti(PMe3)SiHCl3] (2).
  • To determine if a significant interligand hypervalent interaction exists in complex 2.
  • To develop a bonding concept for transition-metal hydrosilane complexes to understand selective M-Si and Si-H bond activation.

Main Methods:

  • Experimental charge density studies.
  • Theoretical charge density studies.
  • Molecular orbital (MO) analyses.

Main Results:

  • Complexes 1 and 2 possess nearly identical electronic structures.
  • No evidence of a significant interligand hypervalent interaction was found for complex 2.
  • The study provides insights into the electronic factors governing the activation of M-Si and Si-H bonds in transition-metal hydrosilane complexes.

Conclusions:

  • The electronic structures of the studied titanium-silane complexes are similar, irrespective of the silicon substituent.
  • The absence of a notable hypervalent interaction in complex 2 simplifies the understanding of its electronic properties.
  • A refined bonding concept is proposed to better predict and control the selective activation of bonds in metal-hydrosilane systems.