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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...

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Related Experiment Video

Updated: Jun 23, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

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Published on: May 27, 2020

Computing ion solvation free energies using the dipolar Poisson model.

Patrice Koehl, Henri Orland, Marc Delarue

The Journal of Physical Chemistry. B

|April 24, 2009

Summary

A new model accurately predicts cation solvation free energies in water. This computational approach combines electrostatic and dipole distribution models for precise results.

Area of Science:

Computational chemistry
Physical chemistry
Solution thermodynamics

Background:

Accurate computation of solvation free energies is crucial for understanding ion behavior in aqueous solutions.
Existing models often struggle to account for the complex interactions between ions and water molecules.

Discussion:

The presented continuum model integrates the Poisson model for electrostatics and the Langevin dipole model.
This approach captures the nonuniform water dipole distribution around cations.
The combined formalism is rooted in statistical thermodynamics.

Key Insights:

The model achieves excellent agreement between computed and experimental solvation free energies for various ions.
Demonstrates high accuracy for both monovalent and divalent cations.

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Provides a unified framework for electrostatic and polarization effects.

Outlook:

Potential applications in predicting ion transport and reactivity in aqueous systems.
Further refinement could extend the model to more complex solutes and solvent mixtures.
Facilitates the design of chemical processes involving ionic solutions.