DSpace Repository

Which density functional is close to CCSD accuracy to describe Geometry and Interaction Energy of small noncovalent dimers? A benchmark study using Gaussian09

Show simple item record

dc.contributor.author Remya, K
dc.contributor.author Suresh, C H
dc.date.accessioned 2013-07-19T04:15:53Z
dc.date.available 2013-07-19T04:15:53Z
dc.date.issued 2013
dc.identifier.citation Journal of Computational Chemistry 34:1341-1353;2013 en_US
dc.identifier.uri http://hdl.handle.net/123456789/563
dc.description.abstract A benchmark study on all possible density functional theory (DFT) methods in Gaussian09 is done to locate functionals that agree well with CCSD/aug-cc-pVTZ geometry and Ave-CCSD(T)/(Q-T) interaction energy (Eint) for small non-covalently interacting molecular dimers in “dispersion-dominated” (class 1), “dipole-induced dipole” (class 2), and “dipole-dipole” (class 3) classes. A DFT method is recommended acceptable if the geometry showed close agreement to CCSD result (RMSD < 0.045) and Eint was within 80–120% accuracy. Among 382 tested functionals, 1–46% gave good geometry, 13–44% gave good Eint, while 1–33% satisfied geometry and energy criteria. Further screening to locate the best performing functionals for all the three classes was made by counting the acceptable values of energy and geometry given by each functionals. The meta-generalized gradient approximation (GGA) functional M06L was the best performer with total 14 hits; seven acceptable energies and seven acceptable geometries. This was the only functional “recommended” for at least two dimers in each class. The functionals M05, B2PLYPD, B971, mPW2PLYPD, PBEB95, and CAM-B3LYP gave 11 hits while PBEhB95, PW91B95, Wb97x, BRxVP86, BRxP86, HSE2PBE, HSEh1PBE, PBE1PBE, PBEh1PBE, and PW91TPSS gave 10 hits. Among these, M05, B971, mPW2PLYPD, Wb97x, and PW91TPSS were among the “recommended” list of at least one dimer from each class. Long-range correction (LC) of Hirao and coworkers to exchange-correlation functionals showed massive improvement in geometry and Eint. The best performing LC-functionals were LC-G96KCIS and LC-PKZBPKZB. Our results predict that M06L is the most trustworthy DFT method in Gaussian09 to study small non-covalently interacting systems. en_US
dc.language.iso en en_US
dc.publisher Wiley en_US
dc.subject Non-covalent interactions en_US
dc.subject DFT benchmark study en_US
dc.subject Dispersion en_US
dc.subject Dipole-dipole systems en_US
dc.subject Dipole-induced dipole systems en_US
dc.subject CCSD en_US
dc.subject Exchange-correlation functions en_US
dc.subject Long-range correction en_US
dc.subject M06L en_US
dc.title Which density functional is close to CCSD accuracy to describe Geometry and Interaction Energy of small noncovalent dimers? A benchmark study using Gaussian09 en_US
dc.type Article en_US


Files in this item

This item appears in the following Collection(s)

  • 2013
    2013 publications

Show simple item record

Search DSpace


Advanced Search

Browse

My Account