A quantum mechanical force field (QMFF) for water is described. Unlike traditional approaches that use quantum mechanical results and experimental data to parameterize empirical potential energy functions, the present QMFF uses a quantum mechanical framework to represent intramolecular and intermolecular interactions in an entire condensed-phase system. In particular, the internal energy terms used in molecular mechanics are replaced by a quantum mechanical formalism that naturally includes electronic polarization due to intermolecular interactions and its effects on the force constants of the intramolecular force field. As a quantum mechanical force field, both intermolecular interactions and the Hamiltonian describing the individual molecular fragments can be parameterized to strive for accuracy and computational efficiency. In this work, we introduce a polarizable molecular orbital model Hamiltonian for water and for oxygen- and hydrogen-containing compounds, whereas the electrostatic potential responsible for intermolecular interactions in the liquid and in solution is modeled by a three-point charge representation that realistically reproduces the total molecular dipole moment and the local hybridization contributions. The present QMFF for water, which is called the XP3P (explicit polarization with three-point-charge potential) model, is suitable for modeling both gas-phase clusters and liquid water. The paper demonstrates the performance of the XP3P model for water and proton clusters and the properties of the pure liquid from about 900 × 106 self-consistent-field calculations on a periodic system consisting of 267 water molecules. The unusual dipole derivative behavior of water, which is incorrectly modeled in molecular mechanics, is naturally reproduced as a result of an electronic structural treatment of chemical bonding by XP3P. We anticipate that the XP3P model will be useful for studying proton transport in solution and solid phases as well as across biological ion channels through membranes.
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7 August 2013
Research Article|
August 01 2013
Quantum mechanical force field for water with explicit electronic polarization
Jaebeom Han;
Jaebeom Han
a)
Department of Chemistry and Supercomputing Institute,
University of Minnesota
, 207 Pleasant Street, SE, Minneapolis, Minnesota 55455-0431, USA
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Michael J. M. Mazack;
Michael J. M. Mazack
Department of Chemistry and Supercomputing Institute,
University of Minnesota
, 207 Pleasant Street, SE, Minneapolis, Minnesota 55455-0431, USA
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Peng Zhang;
Peng Zhang
Department of Chemistry and Supercomputing Institute,
University of Minnesota
, 207 Pleasant Street, SE, Minneapolis, Minnesota 55455-0431, USA
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Donald G. Truhlar;
Donald G. Truhlar
b)
Department of Chemistry and Supercomputing Institute,
University of Minnesota
, 207 Pleasant Street, SE, Minneapolis, Minnesota 55455-0431, USA
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a)
J. Han and M. J. M. Mazack contributed equally to this work.
b)
Electronic addresses: mazack@mazack.org; truhlar@umn.edu; and gao@jialigao.org. Telephone: 1-612-625-0769. Fax: 1-612-624-0741.
J. Chem. Phys. 139, 054503 (2013)
Article history
Received:
April 26 2013
Accepted:
July 08 2013
Citation
Jaebeom Han, Michael J. M. Mazack, Peng Zhang, Donald G. Truhlar, Jiali Gao; Quantum mechanical force field for water with explicit electronic polarization. J. Chem. Phys. 7 August 2013; 139 (5): 054503. https://doi.org/10.1063/1.4816280
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