Journal
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
Volume 14, Issue -, Pages 1181-1191Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjoc.14.99
Keywords
benzene; DFT; dispersion; van der Waals
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Funding
- Griffith University Gowonda HPC Cluster
- Australian Government through the Australian Research Council [ARC DP160101301]
- Government of Western Australia
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Australian Government
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Modern approaches to modelling dispersion forces are becoming increasingly accurate, and can predict accurate binding distances and energies. However, it is possible that these successes reflect a fortuitous cancellation of errors at equilibrium. Thus, in this work we investigate whether a selection of modem dispersion methods agree with benchmark calculations across several potential-energy curves of the benzene dimer to determine if they are capable of describing forces and energies outside equilibrium. We find the exchange-hole dipole moment (XDM) model describes most cases with the highest overall agreement with reference data for energies and forces, with many-body dispersion (MBD) and its fractionally ionic (FI) variant performing essentially as well. Popular approaches, such as Grimme-D and van der Waals density functional approximations (vdW-DFAs) underperform on our tests. The meta-GGA M06-L is surprisingly good for a method without explicit dispersion corrections. Some problems with SCAN+rVV10 are uncovered and briefly discussed.
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