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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

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Group Polarizability Model for Molecular Mechanics Energy Functions.

Kim Palmo¹, Samuel Krimm¹

¹Biophysics Research Division and Department of Physics, 930 North University Avenue, University of Michigan, Ann Arbor, Michigan 48109.

Journal of Chemical Theory and Computation

|December 5, 2015

Summary

A new polarization model enhances molecular mechanics force fields by treating atomic groups as polarizable units. This method accurately predicts molecular properties, improving simulations for water, alkanes, and N-methylacetamide.

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Area of Science:

Computational Chemistry
Molecular Modeling
Physical Chemistry

Background:

Molecular mechanics force fields often lack accurate polarization effects.
Including polarization is crucial for precise simulation of molecular properties.

Purpose of the Study:

Develop a novel polarization model for molecular mechanics energy functions.
Incorporate anisotropic polarizability and hyperpolarizability using a local group paradigm.

Main Methods:

A local group paradigm was employed, defining polarizability for rigid substructures.
Axes at a diffuse site determined anisotropic local group polarizability and hyperpolarizability.
The ab initio-based spectroscopically determined force field (SDFF) protocol was used for parameter calculation.

Main Results:

The model demonstrated excellent agreement with quantum mechanical electric potentials.
Calculated molecular polarizabilities closely matched experimental and quantum mechanical data.
Accurate modeling of structures, energies, and forces was achieved.

Conclusions:

The developed polarization model is a strong candidate for inclusion in molecular mechanics force fields.
This approach significantly improves the accuracy of molecular simulations.
The model ensures precise prediction of molecular properties and interactions.