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Issue 20, 2006
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Comparison of frozen-density embedding and discrete reaction field solvent models for molecular properties

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Abstract

We investigate the performance of two discrete solvent models in connection with density functional theory (DFT) for the calculation of molecular properties. In our comparison we include the discrete reaction field (DRF) model, a combined quantum mechanics and molecular mechanics (QM/MM) model using a polarizable force field, and the frozen-density embedding (FDE) scheme. We employ these solvent models for ground state properties (dipole and quadrupole moments) and response properties (electronic excitation energies and frequency-dependent polarizabilities) of a water molecule in the liquid phase. It is found that both solvent models agree for ground state properties, while there are significant differences in the description of response properties. The origin of these differences is analyzed in detail and it is found that they are mainly caused by a different description of the ground state molecular orbitals of the solute. In addition, for the calculation of the polarizabilities, the inclusion of the response of the solvent to the polarization of the solute becomes important. This effect is included in the DRF model, but is missing in the FDE scheme. A way of including it in FDE calculations of the polarizabilities using finite field calculations is demonstrated.

Graphical abstract: Comparison of frozen-density embedding and discrete reaction field solvent models for molecular properties

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Publication details

The article was received on 10 Feb 2006, accepted on 04 Apr 2006 and first published on 20 Apr 2006


Article type: Paper
DOI: 10.1039/B601997H
Citation: Phys. Chem. Chem. Phys., 2006,8, 2349-2359

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    Comparison of frozen-density embedding and discrete reaction field solvent models for molecular properties

    C. R. Jacob, J. Neugebauer, L. Jensen and L. Visscher, Phys. Chem. Chem. Phys., 2006, 8, 2349
    DOI: 10.1039/B601997H

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