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Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons

Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
Calculations of Electric Potential II01:27

Calculations of Electric Potential II

An electric dipole is a system of two equal but opposite charges, separated by a fixed distance. This system is used to model many real-world systems, including atomic and molecular interactions. One of these systems is the water molecule, but only under certain circumstances. These circumstances are met inside a microwave oven, where electric fields with alternating directions make the water molecules change orientation. This vibration is equivalent to heat at the molecular level.
Consider a...
Molecular Geometry and Dipole Moments02:36

Molecular Geometry and Dipole Moments

The VSEPR theory can be used to determine the electron pair geometries and molecular structures as follows:
Formal Charges02:42

Formal Charges

In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists.
Lewis Structures and Formal Charges02:19

Lewis Structures and Formal Charges

Lewis symbols can be used to indicate the formation of covalent bonds, which are shown in Lewis structures—drawings that describe the bonding in molecules and polyatomic ions. The periodic table can be used to predict the number of valence electrons in an atom and the number of bonds that will be formed to reach an octet. Group 18 elements, such as argon and helium, have filled electron configurations and thus rarely participate in chemical bonding. However, atoms from group 17, such as bromine...

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Updated: Jun 21, 2026

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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The electronegativity equalization method and the split charge equilibration applied to organic systems:

Toon Verstraelen1, Veronique Van Speybroeck, Michel Waroquier

  • 1Center for Molecular Modeling, Ghent University, 9000 Ghent, Belgium.

The Journal of Chemical Physics
|August 7, 2009
PubMed
Summary

The split charge equilibration (SQE) model significantly outperforms the electronegativity equalization method (EEM) for calculating atomic partial charges. SQE accurately predicts molecular polarizability, making it superior for developing polarizable force fields.

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Area of Science:

  • Computational Chemistry
  • Molecular Modeling
  • Quantum Chemistry

Background:

  • Electronegativity equalization method (EEM) and split charge equilibration (SQE) models compute atomic partial charges for polarizable force fields.
  • SQE extends EEM to improve molecular polarizability calculations.

Purpose of the Study:

  • To extensively benchmark EEM and SQE models using diverse organic molecules.
  • To determine optimal parametrization protocols for both EEM and SQE.
  • To compare the performance of EEM and SQE in reproducing quantum mechanical results.

Main Methods:

  • Systematic benchmarking of 12 parametrization protocols for EEM and SQE.
  • Training data generated from MP2/Aug-CC-pVDZ calculations on 500 diverse organic molecules.
  • Calibration using Hirshfeld-I charges to reproduce molecular electrostatic potential.

Main Results:

  • SQE model demonstrated superior performance over EEM across all benchmark assessments.
  • SQE accurately reproduced molecular electrostatic potential when calibrated with Hirshfeld-I charges.
  • EEM showed divergent polarizability behavior in chain molecules, while SQE exhibited correct trends.

Conclusions:

  • The SQE model is a more accurate and reliable method for calculating atomic partial charges compared to EEM.
  • SQE is crucial for developing accurate polarizable force fields, offering significant advantages over EEM.
  • SQE's ability to correctly model polarizability trends makes it essential for molecular simulations.