Ion Correlation in Choline Chloride-Urea Deep Eutectic Solvent (Reline) from Polarizable Molecular Dynamics...

Area of Science:

• Computational Chemistry
• Materials Science
• Physical Chemistry

Background:

• Deep eutectic solvents (DESs) are gaining traction as sustainable alternatives to traditional solvents.
• Accurate molecular modeling is crucial for understanding and optimizing DES properties.

Purpose of the Study:

• To develop a polarizable force field for the choline chloride/urea (reline) DES.
• To validate the model against first-principles simulations and experimental data.

Main Methods:

• Development of a polarizable model using the CHARMM Drude force field.
• Introduction of a damping factor to correct over-binding in simulations.
• Analysis of radial distribution functions and dynamic properties.

Main Results:

• The polarizable model successfully reproduces the structure of reline, showing hydrogen bonding between constituents.
• Dynamic properties predicted by the model align well with experimental results, outperforming nonpolarizable models.
• Anion velocity autocorrelation function exhibits oscillatory behavior, suggesting cation-anion interactions.

Conclusions:

• The developed polarizable force field provides a reliable tool for simulating reline DES.
• The model captures key structural and dynamic features, aiding in the understanding of DES behavior.
• Further investigation into ion pair diffusion in DES is warranted.