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Electrostatic potentials and covalent radii.

Peter Politzer1, Jane S Murray, Pat Lane

  • 1Department of Chemistry, University of New Orleans, New Orleans, Louisiana 70148, USA.

Journal of Computational Chemistry
|February 21, 2003
PubMed
Summary
This summary is machine-generated.

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This study defines new covalent radii based on electrostatic potential minima in molecules. These radii accurately predict bond lengths for various atoms and bond types.

Area of Science:

  • Quantum Chemistry
  • Computational Chemistry
  • Physical Chemistry

Background:

  • The electrostatic potential V(r) is crucial for understanding electron-nucleus interactions in molecules.
  • The minimum of V(r) along the internuclear axis represents a point of balanced electrostatic forces.

Purpose of the Study:

  • To establish a novel method for defining covalent radii.
  • To determine accurate single- and multiple-bond covalent radii for first- and second-row atoms plus hydrogen.
  • To validate the predictive power of these radii for molecular bond lengths.

Main Methods:

  • Utilized density functional calculations (B3PW91/6-311+G**) for 59 molecules.
  • Located electrostatic potential V(r) minima in 95 chemical bonds.
  • Derived covalent radii based on distances from nuclei to these V(r) minima.

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Main Results:

  • Developed a set of covalent radii that vary depending on the bonded atoms (first-row, second-row, or hydrogen).
  • Demonstrated that a single covalent radius per atom is insufficient.
  • Successfully predicted bond lengths for 33 single and multiple bonds with high accuracy (average error < 0.04 Å).

Conclusions:

  • The proposed method based on electrostatic potential minima provides a physically meaningful and accurate definition of covalent radii.
  • The derived covalent radii offer improved predictions of molecular bond lengths compared to traditional methods.
  • This approach advances the understanding of atomic sizes and bonding in molecules.