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Deep Eutectic Solvents: Molecular Simulations with a First-Principles Polarizable Force Field.

Kyeong-Jun Jeong1, Jesse G McDaniel2, Arun Yethiraj1

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Researchers developed a new force field for reline, a deep eutectic solvent, improving simulations of complex liquids. This computational method enhances understanding of hydrogen bonding and molecular dynamics.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Deep eutectic solvents (DES) possess unique properties driving diverse applications.
  • Accurate computational modeling of DES is crucial for understanding their behavior.

Purpose of the Study:

  • To develop a first-principles force field for reline (choline chloride:urea, 1:2).
  • To validate the force field against first-principles molecular dynamics (FPMD) and experimental data.
  • To investigate the influence of polarizability on structural and dynamic properties.

Main Methods:

  • Symmetry Adapted Perturbation Theory (SAPT) for initial force field development.
  • Adjustments based on FPMD simulations for improved accuracy.
  • Molecular dynamics simulations using both polarizable and nonpolarizable force fields.

Main Results:

  • The developed force field accurately reproduces reline's structure and dynamics.
  • Identified preferential formation of choline-chloride ionic pairs and urea coordination via hydrogen bonds.
  • Polarizable force field simulations showed significantly enhanced diffusion constants and altered hydrogen bond dynamics.

Conclusions:

  • The new force field provides a reliable tool for simulating reline.
  • Polarizability is essential for capturing accurate long-range structural order and dynamics.
  • This work facilitates first-principles studies of complex hydrogen-bonding liquids.