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Computation of hydration free energies using a parameterized continuum model: Study of equilibrium geometries and reactive processes in water solution
Author(s) -
Tuñón Iñaki,
RuizLópez Manuel F.,
Rinaldi Daniel,
Bertrán Juan
Publication year - 1996
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/(sici)1096-987x(19960130)17:2<148::aid-jcc2>3.0.co;2-w
Subject(s) - parameterized complexity , solvation , computation , chemistry , ab initio , molecule , thermodynamics , water model , computational chemistry , implicit solvation , atomic physics , molecular dynamics , physics , mathematics , algorithm , organic chemistry
A parameterized self‐consistent reaction field model allowing computation of the total free energy of hydration of organic molecules at the ab initio level is presented. The approach uses electrostatic plus polarization energies calculated with the help of a continuum model. The remaining solvation free energy terms are obtained by a simple formula based on atomic parameters and atomic accessible surface areas (ASAs), which are determined with the ASA analytical algorithm. Analytical derivatives of the atomic surfaces areas have been implemented. The atomic parameters have been obtained by a linear regression fit of the calculated and experimental free energies of solution in water for a set of 35 molecules, leading to a standard deviation of 0.75 kcal/mol. Effects of nonelectrostatic terms on solute geometries, association energies, and activation barriers are illustrated. © 1996 by John Wiley & Sons, Inc.