- Poster presentation
- Open Access
Performance of dispersion-corrected density functional theory for thermochemistry and non-covalent interactions
© Hujo and Grimme; licensee BioMed Central Ltd. 2012
- Published: 1 May 2012
- Interaction Energy
- Strong Hydrogen Bond
- Potential Energy Curve
- Dispersion Correction
- Thermochemical Property
The accuracy of non-local van der Waals density functional  is tested for the thermochemical properties of 1200+ atoms and molecules in the GMTKN30 database. Five (hybrid)GGA functionals are augmented by the non-local (NL) part of the VV10 functional. The widely used atom-pair wise dispersion correction DFT-D3  is considered for comparison. The addition of the NL dispersion energy definitely improves the results of all tested short-range functionals. Based on little empiricism and basic physical insight, DFT-NL can be recommended as robust electronic structure method.
For more detailed insight into non-covalent bonding, potential energy curves  for five complexes with weak to medium strong hydrogen bonds have been computed with dispersion corrected DFT methods VV10, DFT-D3 and vdW-DF2 . All dispersion corrected methods perform reasonably well for these hydrogen bonds. For the fluorinated complexes, the VV10 method gives remarkably good results. The vdW-DF2 method yields good interaction energies similar to the other methods, but fails to provide accurate equilibrium separations. For large-scale applications we can recommend DFT-D3 based structure optimizations with subsequent checking of interaction energies by single-point VV10 computations.
- Vydrov OA, van Voorhis T: . J Chem Phys. 2010, 133: 244103-10.1063/1.3521275.View ArticleGoogle Scholar
- Grimme S, Antony J, Ehrlich S, Krieg H: . J Chem Phys. 2010, 132: 154104-10.1063/1.3382344.View ArticleGoogle Scholar
- Hujo W, Grimme S: . Phys Chem Chem Phys. 2011, 13: 13942-View ArticleGoogle Scholar
- Lee K, Murray ED, Kong L, Lundqvist BI, Langreth DC: . Phys Rev B. 2010, 82: 081101-View ArticleGoogle Scholar
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