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Related Experiment Video

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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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Force Fields for Deep Eutectic Mixtures: Application to Structure, Thermodynamics and 2D-Infrared Spectroscopy.

Kai Töpfer¹, Eric Boittier¹, Mike Devereux¹

¹Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland.

The Journal of Physical Chemistry. B

|October 24, 2024

Summary

Improving energy functions for ionic systems is crucial. Models using fluctuating minimal distributed charges (fMDCM) better reproduce experimental properties of water-acetamide-SCN-K+ eutectic mixtures compared to multipole models.

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Spatial Separation of Molecular Conformers and Clusters

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Published on: January 9, 2014

Area of Science:

Physical Chemistry
Computational Chemistry
Materials Science

Background:

Parametrizing energy functions for ionic systems presents significant challenges.
Accurate modeling of electrostatic interactions is vital for understanding ionic mixtures.

Purpose of the Study:

To improve the total energy function for a eutectic system containing water, potassium ions (K+), thiocyanate ions (SCN-), and acetamide.
To evaluate different electrostatic models for their ability to reproduce experimental properties.

Main Methods:

Developed and compared three models: M0 (atom-centered multipoles) and M1/M2 (fluctuating minimal distributed charges - fMDCM).
Adjusted Lennard-Jones parameters for the SCN- anion to match experimental hydration free energies and densities.
Performed molecular dynamics simulations across varying water content (0-100%).

Main Results:

All models achieved high accuracy (within a few percent) for hydration free energies and densities.
fMDCM-based models (M1, M2) showed greater consistency with experimental radial distribution and frequency correlation functions compared to the multipole model (M0).
Computed viscosities from M1 and M2 models were within 30% of experimental values and captured trends with water content, unlike M0.

Conclusions:

Fluctuating minimal distributed charges (fMDCM) provide a more accurate and consistent approach for modeling ionic eutectic systems than traditional atom-centered multipoles.
The refined energy functions and simulation methods offer improved predictive power for the behavior of these complex mixtures.