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Related Experiment Videos

Are metal alkoxides linear owing to electrostatic repulsion?

Maria Rosa Russo1, Nikolas Kaltsoyannis, Andrea Sella

  • 1Department of Chemistry, University College London, 20 Gordon Street, London, UK.

Chemical Communications (Cambridge, England)
|November 15, 2002
PubMed
Summary

Density functional theory calculations reveal electrostatic repulsion drives linearity in lanthanide complexes. This finding explains the structural arrangement in [LanthanideCp2APh] compounds.

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Area of Science:

  • Organometallic Chemistry
  • Computational Chemistry
  • Lanthanide Chemistry

Background:

  • Lanthanide complexes with cyclopentadienyl (Cp) and phenyl (Ph) ligands are of interest in various chemical applications.
  • Understanding the structural preferences of these complexes is crucial for designing new materials and catalysts.
  • The geometry around the lanthanide center can significantly influence reactivity and properties.

Purpose of the Study:

  • To investigate the structural factors governing the linearity of Ln-O-C vectors in [LnCp2APh] complexes.
  • To elucidate the role of electrostatic interactions in determining the coordination geometry of lanthanides.
  • To provide insights into the bonding and electronic structure of these organometallic compounds.

Main Methods:

  • Density functional theory (DFT) calculations were employed to model the electronic structure and geometry of [LnCp2APh] complexes.

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  • Various lanthanide elements (Ln = La, Lu) and chalcogen atoms (A = O, S) were studied.
  • Analysis focused on the Ln-O-C bond angles and interatomic distances.

    • Main Results:

    • DFT calculations indicate that electrostatic repulsion between the alpha-carbon of the phenyl group and the trivalent lanthanide metal center is a primary factor.
    • This repulsion effectively forces the Ln-O-C vector into a linear or near-linear arrangement.
    • The observed linearity is consistent across different lanthanide elements and chalcogen substitutions.

    Conclusions:

    • The linearity of Ln-O-C vectors in [LnCp2APh] complexes is predominantly dictated by electrostatic forces.
    • This understanding of geometric preferences can guide the synthesis of novel lanthanide-based organometallic compounds.
    • Computational methods provide valuable tools for predicting and explaining structural motifs in complex inorganic systems.