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Density functional study of small molecules and transition‐metal carbonyls using revised PBE functionals
Author(s) -
Matveev Alexei,
Staufer Markus,
Mayer Markus,
Rösch Notker
Publication year - 1999
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/(sici)1097-461x(1999)75:4/5<863::aid-qua51>3.0.co;2-t
Subject(s) - chemistry , yield (engineering) , dissociation (chemistry) , transition metal , bond dissociation energy , gaussian , computational chemistry , molecule , hybrid functional , density functional theory , thermodynamics , metal carbonyl , metal , physics , catalysis , organic chemistry
We have implemented the generalized gradient approximation (GGA) exchange–correlation functional suggested by Perdew, Burke, and Ernzerhof (PBE) and two of its recent revisions, revPBE and RPBE, in the program ParaGauss, which is a new version of the LCGTO‐FF (fitting function) approach designed for parallel computers. With these new functionals, we investigated a test suite of 19 small molecules as well as the transition‐metal carbonyls of Cr, Fe, and Ni using very flexible Gaussian‐type orbital (GTO) basis sets. Both revised PBE functionals yield very similar results for the atomization energies of small molecules, improved over those obtained with conventional GGAs (BP, PW91, PBE) as judged by the average absolute error (5 kcal/mol reduced from 8 kcal/mol). Atomization energies of revised PBE functionals are on the average 7 kcal/mol smaller than those of conventional GGAs, consistent with an average bond elongation by about 0.006 Å relative to these GGAs. Revised PBE functionals yield bond distances on average 0.016 Å longer than experiment. With revised PBE functionals, the first carbonyl dissociation energies of Cr(CO) 6 , Fe(CO) 5 , and Ni(CO) 4 are calculated in excellent agreement with experiment whereas structures are calculated very similar to those of conventional GGAs. ©1999 John Wiley & Sons, Inc. Int J Quant Chem 75: 863–873, 1999