The polarizability of point-polarizable water models: density functional theory/molecular mechanics results

The Journal of Physical Chemistry. B
Bernhard Schropp, Paul Tavan

Abstract

Molecular dynamics (MD) simulations of bulk liquid water at different thermodynamic conditions or of biomolecules in aqueous solution require a molecular mechanics (MM) force field that accounts for the sizable electronic polarizability alpha of the water molecule. A considerable number of such polarizable water models has been suggested in the past. Most of them agree that one should employ the experimental value alpha(exp) for the electronic polarizability and compute the induced dipole moment micro(i) through linear response from the electric field E at the position r(o) of the oxygen atom. However, several more recent models have suggested somewhat smaller values for alpha. Using a hybrid method that combines density functional theory for a selected water molecule with an MM description of its liquid water environment, here we show that the choice of alpha(exp) is solely correct if the induced dipole moment mui is calculated from the average electric field E within the volume occupied by the given water molecule. Because of considerable field inhomogeneities caused by the structured aqueous environment, the average field E is much smaller than the local spot check E(r(o)). However, as opposed to E(r(o)), the average field E...Continue Reading

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Citations

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Apr 24, 2010·The Journal of Physical Chemistry. B·Bernhard SchroppPaul Tavan
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