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Quantitative evaluation of hydration thermodynamics with a continuum model

A A Rashin1, L Young, I A Topol

  • 1BioChemComp Inc, Teaneck, NJ 07666.

Biophysical Chemistry
|August 1, 1994
PubMed
Summary

This study shows a continuum model can predict hydration entropies and enthalpies for small molecules. Accuracy improves with solute polarizability and dipole moment considerations, achieving 1.5 kcal/mol agreement for free energies of hydration.

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Area of Science:

  • Computational Chemistry
  • Physical Chemistry
  • Molecular Modeling

Background:

  • Accurate prediction of molecular hydration properties is crucial for understanding chemical and biological processes.
  • Continuum models offer a computationally efficient approach to solvation free energy calculations.

Purpose of the Study:

  • To quantitatively evaluate a continuum model with classical reaction field formalism for predicting experimental hydration properties (entropies, enthalpies, free energies) of small, uncharged molecules.
  • To identify key molecular descriptors and computational factors influencing the accuracy of hydration property predictions.

Main Methods:

  • Utilized a continuum solvation model incorporating a classical reaction field.
  • Correlated hydration entropies with molecular accessible surface area using five atom types.

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  • Investigated the impact of solute polarizability, dipole moments, and quadrupole moments on hydration enthalpies.
  • Employed density functional theory (DFT) with a DZVPD basis set for dipole moment calculations.

    • Main Results:

    • Achieved satisfactory reproduction of hydration entropies (T delta S) within 1-1.5 kcal/mol for over 40 solutes, primarily based on accessible surface area.
    • Reasonable agreement for hydration enthalpies was obtained only when solute polarizability was included.
    • Demonstrated strong dependence of electrostatic contributions to hydration enthalpies on dipole moment magnitude and direction.
    • DFT calculations accurately predicted experimental dipole moments within 0.1 D.
    • Identified significant impact of dipole moment uncertainties (0.1 D) and directional changes (30 degrees) on hydration enthalpy predictions.
    • Showed that point charge representations of multipole expansions lead to discrepancies of ~3 kcal/mol in hydration enthalpies.

    Conclusions:

    • A continuum model, particularly when considering accessible surface area and solute polarizability, can quantitatively rationalize experimental hydration entropies and enthalpies.
    • Accurate prediction of molecular dipole moments and their orientation is critical for reliable hydration enthalpy calculations.
    • Errors in hydration enthalpy and entropy calculations often compensate, leading to good agreement for free energies of hydration within 1.5 kcal/mol.