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- Title
Comparative analysis of the performance of commonly available density functionals in the determination of geometrical parameters for zinc complexes.
- Authors
SOUSA, SÉRGIO F.; CARVALHO, EMANUELA S.; FERREIRA, DIANA M.; TAVARES, ISABEL S.; FERNANDES, PEDRO A.; RAMOS, MARIA JOÃO; GOMES, JOSÉ A. N. F.
- Abstract
A set of 44 Zinc-ligand bond-lengths and of 60 ligand-metal-ligand bond angles from 10 diverse transition-metal complexes, representative of the coordination spheres of typical biological Zn systems, were used to evaluate the performance of a total of 18 commonly available density functionals in geometry determination. Five different basis sets were considered for each density functional, namely two all-electron basis sets (a double-zeta and triple-zeta formulation) and three basis sets including popular types of effective-core potentials: Los Alamos, Steven-Basch-Krauss, and Stuttgart-Dresden. The results show that there are presently several better alternatives to the popular B3LYP density functional for the determination of Zn-ligand bond-lengths and angles. BB1K, MPWB1K, MPW1K, B97-2 and TPSS are suggested as the strongest alternatives for this effect presently available in most computational chemistry software packages. In addition, the results show that the use of effective-core potentials (in particular Stuttgart-Dresden) has a very limited impact, in terms of accuracy, in the determination of metal-ligand bond-lengths and angles in Zinc-complexes, and is a good and safe alternative to the use of an all-electron basis set such as 6-31G(d) or 6-311G(d,p). © 2009 Wiley Periodicals, Inc. J Comput Chem 2009
- Subjects
LOS Alamos (N.M.); NEW Mexico; LIGANDS (Chemistry); ENZYMES; METAL complexes; BIOLOGICAL systems; DENSITY functionals; BENCHMARKING (Management)
- Publication
Journal of Computational Chemistry, 2009, Vol 30, Issue 16, p2752
- ISSN
0192-8651
- Publication type
Article
- DOI
10.1002/jcc.21304