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Solvation thermodynamics of neutral and charged solutes using the solvation‐layer interface condition continuum dielectric model

Journal Article · · International Journal of Quantum Chemistry
DOI:https://doi.org/10.1002/qua.25771· OSTI ID:1479564
 [1];  [2];  [1];  [3];  [4]
  1. Department of Mechanical Engineering Northeastern University Boston Massachusetts
  2. Department of Physics Northeastern University Boston Massachusetts
  3. Department of Computer Science SUNY Buffalo Buffalo New York
  4. GlaxoSmithKline Collegeville Pennsylvania
Abstract

We demonstrate that the solvation‐layer interface condition (SLIC) continuum dielectric model for molecular electrostatics, combined with a simple solvent‐accessible‐surface‐area (SASA)‐proportional model for nonpolar solvent effects, accurately predicts solvation entropies of neutral and charged small molecules. The SLIC/SASA model has only seven fitting parameters in total and achieves this accuracy using a training set with only 20 compounds. Despite this simplicity, solvation free energies and entropies are nearly as accurate as those predicted by the more sophisticated Langevin dipoles solvation model. Surprisingly, the model automatically reproduces the negligible contribution of electrostatics to the solvation of hydrophobic compounds. Opportunities for improvement include nonpolar solvation, anion solvation entropies, and heat capacities. More molecular realism may be needed for these quantities. To enable a future, explicit‐solvent‐based assessment of the SLIC/SASA implicit‐solvent model, we predict solvation entropies for the Mobley test set, which are available as Supporting Information.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1479564
Journal Information:
International Journal of Quantum Chemistry, Journal Name: International Journal of Quantum Chemistry Journal Issue: 1 Vol. 119; ISSN 0020-7608
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
United States
Language:
English

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