title: Performance of Density Functional Theory Procedures for the Calculation of Proton-Exchange Barriers: Unusual Behavior of M06-Type Functionals.
abstract: We have examined the performance of a variety of density functional theory procedures for the calculation of complexation energies and proton-exchange barriers, with a focus on the Minnesota-class of functionals that are generally highly robust and generally show good accuracy. A curious observation is that M05-type and M06-type methods show an atypical decrease in calculated barriers with increasing proportion of Hartree-Fock exchange. To obtain a clearer picture of the performance of the underlying components of M05-type and M06-type functionals, we have investigated the combination of MPW-type and PBE-type exchange and B95-type and PBE-type correlation procedures. We find that, for the extensive E3 test set, the general performance of the various hybrid-DFT procedures improves in the following order: PBE1-B95 → PBE1-PBE → MPW1-PBE → PW6-B95. As M05-type and M06-type procedures are related to PBE1-B95, it would be of interest to formulate and examine the general performance of an alternative Minnesota DFT method related to PW6-B95.
authors.affiliation: School of Chemistry, University of Sydney , Sydney, NSW 2006, Australia.
authors.forename: Bun
authors.initials: B
authors.lastname: Chan
authors.forename: Andrew T B
authors.initials: AT
authors.lastname: Gilbert
authors.forename: Peter M W
authors.initials: PM
authors.lastname: Gill
authors.affiliation: School of Chemistry, University of Sydney , Sydney, NSW 2006, Australia.
authors.forename: Leo
authors.initials: L
authors.lastname: Radom