Molecular simulation of absolute hydration Gibbs energies of polar compounds

N. M. Garrido, A. J. Queimada, M. Jorge, I. G. Economou, E. A. Macedo

Research output: Contribution to journalArticle

15 Citations (Scopus)
129 Downloads (Pure)

Abstract

In this work, we present simulation-based predictions of the absolute hydration energy for several simple polar molecules with different functional groups, as well as for more complex multifunctional molecules. Our calculations were performed using the thermodynamic integration methodology where electrostatic and non-polar interactions were treated separately, allowing for a stable transition path between the end-points of the integration. An appropriate methodology for the analytical integration of the simulation data was applied. We compare the performance of three popular molecular mechanics force fields: TraPPE. Gromos and OPLS-AA for the description of solute atoms in MSPC/E water. It is observed that these force fields generally perform well for the simpler molecules, but are less accurate when multifunctional molecules are considered. 

Original languageEnglish
Pages (from-to)110-115
Number of pages6
JournalFluid Phase Equilibria
Volume296
Issue number2
DOIs
Publication statusPublished - 25 Sep 2010
EventVIII Ibero-American Conference on Phase Equilibria and Fluid Properties for Process Design - Praia da Rocha, Portugal
Duration: 17 Oct 200921 Oct 2009

Keywords

  • molecular simulation
  • absolute hydration
  • Gibbs energies
  • polar compounds

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