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An Extended Charge Equilibration Method.

Christopher E Wilmer1, Ki Chul Kim1, Randall Q Snurr1

  • 1Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.

The Journal of Physical Chemistry Letters
|August 21, 2015
PubMed
Summary
This summary is machine-generated.

A new method estimates atomic charges using all ionization energies, improving accuracy and reducing parameters. This extended charge equilibration (EQeq) method is computationally efficient for materials like metal-organic frameworks (MOFs).

Keywords:
charge equilibrationelectrostaticsmetal−organic frameworksmolecular simulationpartial chargesrapid screening

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Quantum Chemistry

Background:

  • Accurate partial atomic charges are crucial for predicting material properties.
  • Existing methods like charge equilibration (Qeq) rely on limited ionization energies and numerous parameters.
  • Computational cost for accurate charge derivation can be prohibitive.

Purpose of the Study:

  • To develop an improved method for estimating partial atomic charges.
  • To reduce the number of empirical parameters in charge equilibration methods.
  • To provide a computationally efficient approach for calculating charges in periodic systems.

Main Methods:

  • Extended charge equilibration (EQeq) utilizing all ionization energies.
  • Simultaneous solution of linear equations for charge determination.
  • Calculation of periodic electrostatic interactions using Ewald sums.

Main Results:

  • EQeq significantly reduces ad hoc parameters compared to Qeq.
  • EQeq charges show good agreement with DFT-derived charges (REPEAT method) and ChelpG charges.
  • EQeq method demonstrates comparable performance to electrostatic potential-derived charges for ranking MOFs in carbon capture.

Conclusions:

  • EQeq offers a computationally efficient and accurate alternative for partial atomic charge estimation.
  • The method is particularly advantageous for large systems like metal-organic frameworks (MOFs).
  • EQeq provides a cost-effective tool for materials screening, such as in carbon capture applications.