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The role of exact exchange in the description of Cu2+-(H2O)(n) (n=1-6) complexes by means of DFT methods
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Rios-Font, Raquel, Sodupe, Mariona, Rodriguez-Santiago, Luis and Taylor, Peter R.. (2010) The role of exact exchange in the description of Cu2+-(H2O)(n) (n=1-6) complexes by means of DFT methods. Journal of Physical Chemistry A, Vol.114 (No.40). pp. 10857-10863. ISSN 1089-5639
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Official URL: http://dx.doi.org/10.1021/jp105376s
Abstract
This paper analyses the behavior of different density functionals in the description of the most stable structures of Cu2+-(H2O)(n) complexes (n = 1-6). From n = 3 to n = 6, different coordination numbers of the metal cation were considered. The structures and energies of the complexes were theoretically determined by means of density functional methods that include different amounts of exact exchange: the BLYP functional (0% of exact exchange), the B3LYP functional (20% of exact exchange), the MPWBlK functional (44% of exact exchange), and BHLYP functional (50% of exact exchange). In addition, CCSD(T) calculations with a large basis set were carried out. It has been found that the functionals with lesser amount of exact exchange. especially BLYP, fail to describe the relative energies between the different structures or each cluster because these functionals tend to overestimate the stability of low-coordinated structures. The inclusion of the exact exchange into the functional improves the results, those obtained with MPWBlK and BHLYP being in very good agreement with the CCSD(T) ones. This behavior is related to the poor description of the second ionization energy of Cu by pure functionals, which leads to a too delocalized spin density in the complex with GGA functionals.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QD Chemistry Q Science > QC Physics |
| Divisions: | Faculty of Science > Chemistry Faculty of Science > Centre for Scientific Computing |
| Journal or Publication Title: | Journal of Physical Chemistry A |
| Publisher: | American Chemical Society |
| ISSN: | 1089-5639 |
| Date: | 14 October 2010 |
| Volume: | Vol.114 |
| Number: | No.40 |
| Number of Pages: | 7 |
| Page Range: | pp. 10857-10863 |
| Identification Number: | 10.1021/jp105376s |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| Funder: | Royal Society (Great Britain), MICINN, DIUE, Wolfson Foundation through the Royal Society |
| Grant number: | CTQ2008-06381/BQU, 2009SGR-638 |
| URI: | http://wrap.warwick.ac.uk/id/eprint/5075 |
Data sourced from Thomson Reuters' Web of Knowledge
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