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Electronegativity equalization method: parameterization and validation for organic molecules using the

Zuzana Jirousková1, Radka Svobodová Vareková, Jakub Vanek

  • 1National Centre for Biomolecular Research, Faculty of, Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic.

Journal of Computational Chemistry
|November 7, 2008
PubMed
Summary

This study refines the electronegativity equalization method (EEM) for molecular charge calculations. New parameters were developed using quantum mechanical data, improving accuracy for organic molecules.

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Area of Science:

  • Computational chemistry
  • Quantum chemistry

Background:

  • The electronegativity equalization method (EEM) is a semiempirical approach for calculating molecular charge distributions.
  • Accurate molecular charge distribution is crucial for understanding chemical reactivity and intermolecular interactions.

Purpose of the Study:

  • To parameterize the EEM using Merz-Kollman-Singh (MK) charge distributions derived from B3LYP/6-31G* and HF/6-31G* calculations.
  • To improve existing EEM parameters and develop new ones for elements not previously covered at these computational levels.

Main Methods:

  • Utilized a dataset of 380 organic molecules from the Cambridge Structural Database (CSD).
  • Performed B3LYP/6-31G* and HF/6-31G* calculations to obtain MK charges.
  • Developed and refined EEM parameters (A(i), B(i), kappa) for various elements, including S, Br, Cl, and Zn.

Main Results:

  • Improved EEM parameters for C, H, N, O, and F based on B3LYP/6-31G* MK charges.
  • Developed new EEM parameters for S, Br, Cl, and Zn for both B3LYP/6-31G* and HF/6-31G* levels.
  • Validated the new parameters by calculating charges for 116 organic molecules, showing excellent agreement with ab initio results.

Conclusions:

  • The refined EEM parameters provide accurate molecular charge distributions.
  • This enhanced EEM is a reliable tool for computational studies involving organic molecules.