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This study revises OPLS-2009IL force field parameters for ionic liquids, enabling molecular dynamics (MD) simulations. New parameters and charge scaling improve accuracy for predicting diverse ionic liquid properties.

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • The OPLS-2009IL force field was initially developed for specific ionic liquids using Monte Carlo methods.
  • Experimental validation was limited, and the original parameters could not capture dynamic properties.
  • There was a need for improved force field parameters to accurately simulate a wider range of ionic liquids and their properties.

Purpose of the Study:

  • To adapt existing OPLS-2009IL force field parameters for molecular dynamics (MD) simulations.
  • To develop new OPLS-AA parameters for a variety of anions to expand the applicability of the force field.
  • To validate the improved force field by comparing computed properties with experimental data and ab initio simulations.

Main Methods:

  • Revising OPLS-2009IL parameters for [RMIM] cations for MD simulations.
  • Developing new OPLS-AA parameters for numerous anions.
  • Investigating a ±0.8e charge scaling factor to account for polarization and charge transfer effects.
  • Calculating and comparing densities, heats of vaporization, viscosities, diffusion coefficients, heat capacities, and surface tensions with experimental data.
  • Analyzing radial distribution functions (RDFs) to assess cation-anion interactions.

Main Results:

  • The revised force field parameters and new anion parameters showed favorable agreement with experimental data for various solvent properties.
  • Charge scaling by 0.8e significantly improved predictions of heat of vaporization, surface tension, and self-diffusivity.
  • The scaled force field accurately reproduced cation-anion interactions as evidenced by radial distribution functions from ab initio MD simulations.

Conclusions:

  • The adapted OPLS-2009IL force field, with new anion parameters and charge scaling, provides a more accurate representation of ionic liquids for MD simulations.
  • The 0.8e charge scaling is an effective strategy to improve the accuracy of force fields for ionic liquids, particularly for properties influenced by charge distribution.
  • This work offers a validated computational tool for predicting the behavior and properties of a broad range of ionic liquids.