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Dispersion-corrected energy decomposition analysis for intermolecular interactions based on the BLW and dDXDM methods
Stephan N Steinmann1, Clemence Corminboeuf, Wei Wu
1Laboratory for Computational Molecular Design, Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
The block-localized wave function-electron density (BLW-ED) method now includes dispersion corrections. This reveals dispersion interactions are an independent component in energy decomposition analysis, minimally affecting polarization and charge transfer.
Area of Science:
- Computational Chemistry
- Quantum Chemistry
- Theoretical Chemistry
Background:
- The block-localized wave function (BLW) method, a simplified valence bond theory, analyzes intermolecular interactions using energy components at the DFT level.
- Standard density functional approximations often neglect long-range dispersion interactions, impacting the accuracy of energy decomposition analysis (EDA).
Purpose of the Study:
- To investigate the influence of long-range dispersion interactions on EDA within the BLW-ED framework.
- To incorporate density-dependent dispersion corrections into the BLW-ED approach for a more comprehensive analysis.
Main Methods:
- Incorporation of the density-dependent dispersion correction (dDXDM) into the BLW-electron density (BLW-ED) method.
- Application of the modified BLW-ED approach to various systems, including hydrogen-bonding, acid-base pairs, and van der Waals complexes.
- Analysis of energy components, specifically polarization and charge transfer, with and without dispersion corrections.
Main Results:
- The inclusion of long-range dispersion corrections minimally affects polarization and charge-transfer energy components in the BLW-ED analysis.
- Dispersion interactions can be treated as an independent component within this energy decomposition analysis framework.
- The dDXDM approach effectively probes the impact of dispersion on EDA results at the DFT level.
Conclusions:
- Long-range dispersion interactions have a limited impact on polarization and charge transfer in the studied systems.
- Dispersion energy can be considered a distinct and independent component in BLW-ED analyses.
- The dDXDM-corrected BLW-ED method provides valuable insights into intermolecular interactions, accounting for dispersion effects.
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