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Infinite Dilution Activity Coefficients as Constraints for Force Field Parametrization and Method Development.

Guilherme Duarte Ramos Matos1, Gaetano Calabrò2, David L Mobley1,3

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This study validates molecular simulation force fields using infinite dilution activity coefficients (IDACs). Calculated IDACs show strong correlation with experimental data, highlighting areas for force field improvement in diverse chemical spaces.

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Area of Science:

  • Computational Chemistry
  • Physical Chemistry
  • Chemical Engineering

Background:

  • Molecular simulations rely on force fields to predict physical properties.
  • Existing force fields often lack accuracy across broad chemical spaces due to limited training data.
  • Accurate force field validation is crucial for reliable molecular simulation predictions.

Purpose of the Study:

  • To assess the accuracy of molecular simulation force fields.
  • To evaluate the utility of infinite dilution activity coefficients (IDACs) as a validation metric.
  • To identify specific chemical functionalities that pose challenges to current force fields.

Main Methods:

  • Calculated 237 infinite dilution activity coefficients (IDACs) using molecular simulations.
  • Compared calculated IDACs against experimental data from NIST's ThermoML database.
  • Analyzed correlations between calculated and experimental IDACs to identify discrepancies.

Main Results:

  • Calculated IDACs demonstrated a strong correlation with experimental values (Pearson R = 0.92 ± 0.01).
  • The study identified specific functional groups that present challenges to the employed force field.
  • IDACs offer a robust validation method, applicable across various chemical environments.

Conclusions:

  • Infinite dilution activity coefficients (IDACs) provide a reliable method for validating molecular simulation force fields.
  • The findings enable targeted improvements in force fields for enhanced accuracy in diverse chemical applications.
  • IDACs serve as a valuable alternative to solvation free energies for comprehensive force field assessment.