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A group electronegativity equalization scheme including external potential effects.

Tom Leyssens1, Paul Geerlings, Daniel Peeters

  • 1Laboratoire de Chimie Quantique, Bâtiment Lavoisier, Université Catholique de Louvain (UCL), place Louis Pasteur 1, B-1348 Louvain-la-Neuve, Belgium. t.leyssens@chim.ucl.ac.be

The Journal of Physical Chemistry. A
|July 14, 2006
PubMed
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This study introduces a novel method to calculate group electronegativities, predicting charge transfer between functional groups accurately. This approach simplifies complex molecular interactions for computational chemistry.

Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Chemical Physics

Background:

  • Accurate calculation of molecular properties is crucial for understanding chemical behavior.
  • Existing methods for electronegativity often struggle to account for the molecular environment.
  • The concept of electronegativity equalization provides a framework for predicting charge distribution.

Purpose of the Study:

  • To develop a reliable method for calculating "group in molecule" electronegativities.
  • To predict charge transfer between functional groups within a molecule.
  • To account for the influence of the molecular environment on electronegativity.

Main Methods:

  • Calculating electron affinity and ionization energy for functional groups using Coupled Cluster Singles Doubles (CCSD) theory.

Related Experiment Videos

  • Approximating the molecular environment using a chemically justified point charge model.
  • Applying Sanderson's electronegativity equalization principle with adjustments for external potential effects.

    • Main Results:

    • Obtained reliable "group in molecule" electronegativity values that implicitly include molecular environment effects.
    • Developed an electronegativity equalization scheme that accounts for external potential.
    • Successfully predicted charge transfer between functional groups, showing high correlation with ab initio calculations.

    Conclusions:

    • The proposed method provides a predictive and accurate way to estimate charge transfer.
    • This approach offers a computationally efficient alternative to full ab initio calculations for charge transfer analysis.
    • The findings advance the understanding of electronic interactions within molecules.