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Does back-bonding involve bonding orbitals in boryl complexes? A theoretical DFT study.

Géraldine Sivignon1, Paul Fleurat-Lessard, Jean-Marie Onno

  • 1Laboratoire de Chimie Physique (CNRS-UMR 8000), Bât. 490, Université de Paris-Sud, 91405 Orsay Cedex, France.

Inorganic Chemistry
|December 10, 2002
PubMed
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Theoretical calculations reveal novel bonding in rhodium-boryl complexes. Unexpected Rh-B bonding and coupled boryl ligands were observed, challenging traditional models in organometallic chemistry.

Area of Science:

  • Organometallic Chemistry
  • Computational Chemistry
  • Inorganic Chemistry

Background:

  • Rhodium complexes with boryl ligands are of interest due to their unique electronic properties.
  • Understanding the bonding modes and structural preferences is crucial for catalyst design and reaction mechanisms.

Purpose of the Study:

  • To investigate the electronic structure and bonding characteristics of tris- and bis(boryl) rhodium complexes using theoretical methods.
  • To elucidate the factors governing the stability and geometry of these complexes.
  • To explore unusual bonding interactions, particularly the role of back-bonding.

Main Methods:

  • Density Functional Theory (DFT) calculations, specifically the B3LYP functional, were employed.
  • Full geometry optimizations and frequency analyses were performed for various isomers.

Related Experiment Videos

  • Molecular Orbital (MO) and Natural Bond Orbital (NBO) analyses were utilized to understand bonding.

    • Main Results:

    • For tris(boryl) complexes with X=OH, the facial (fac) structure was found to be the energetic minimum, consistent with experimental data.
    • Metal-ligand back-bonding in mer isomers involves a Rh-B bonding orbital, deviating from typical d-orbital involvement.
    • Bis(boryl) complexes with X=H exhibit coupled BH(2) moieties, forming a B(2)H(4) ligand resembling a transition state.
    • Tris(boryl) complexes with X=H feature a B(3)H(6) ligand with an isosceles triangular arrangement of boron atoms.

    Conclusions:

    • The study highlights unconventional Rh-B bonding interactions in these complexes.
    • The observed geometries and bonding patterns provide insights into the reactivity and stability of organoboron-metal compounds.
    • Computational methods effectively rationalize experimental observations and predict novel structural motifs.