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Improving ion interaction models requires accounting for ligand dipole polarization. Accurately describing these responses significantly reduces errors in predicting ion behavior across different solvents, enhancing molecular mechanics models.

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Area of Science:

  • Computational chemistry
  • Molecular modeling
  • Physical chemistry

Background:

  • Ion descriptors in molecular mechanics models are typically calibrated using ion-water interactions.
  • The assumption of descriptor transferability to other functional groups, like those in biomolecules, often leads to significant errors.
  • Previous studies highlight inaccuracies when applying ion-water interaction parameters to different chemical environments.

Purpose of the Study:

  • To investigate the transferability of cationic interactions from water to alcohols using a polarizable molecular mechanics model.
  • To identify and address the sources of error in current models regarding ion-ligand interactions.
  • To improve the accuracy of molecular mechanics models for predicting ion behavior in various chemical environments.

Main Methods:

  • Obtained gas phase reference data using high-accuracy quantum Monte Carlo and CCSD(T) methods.
  • Employed benchmarked van der Waals-corrected Density Functional Theory (DFT) for calculations.
  • Analyzed the impact of accurately describing ligand dipole polarization on transferability errors.

Main Results:

  • The original polarizable model exhibited substantial gas phase transferability errors (RMS: 2.3 kcal/mol, Max: 5.1 kcal/mol) for ion-alcohol interactions, overstabilizing these interactions.
  • Accurate description of both low- and high-field ligand dipole polarization responses reduced gas phase errors significantly (RMS: 0.9 kcal/mol, Max: 2.5 kcal/mol).
  • Predictions of condensed phase transfer free energies also showed improvement, although systematic errors related to long-range electrostatics parametrization persist.

Conclusions:

  • The transferability of ion descriptors is limited when assuming interactions with water are representative of other ligands like alcohols.
  • Accurately capturing ligand dipole polarization is crucial for improving the transferability of ion interactions in molecular mechanics models.
  • The findings provide a rational approach to enhance the accuracy of both polarizable and nonpolarizable molecular mechanics models for ionic interactions.