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Cholesky decomposition-based multiconfiguration second-order perturbation theory (CD-CASPT2): application to the spin-state energetics of Co-III(diiminato)(NPh).
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2008 (English)In: Journal of Chemical Theory and Computation, ISSN 1549-9618, E-ISSN 1549-9626, Vol. 4, no 5, 694-702 p.Article in journal (Refereed) Published
Abstract [en]

The electronic structure and low-lying electronic states of a Co-III(diiminato)(NPh) complex have been studied using mulficonfigurational wave function theory (CASSCF/CASPT2) The results have been compared to those obtained with density functional theory. The best agreement with ab initio results is obtained with a modified B3LYP functional containing a reduced amount (15%) of Hartree-Fock exchange. A relativistic basis set with 869 functions has been employed in the most extensive ab initio calculations, where a Cholesky decomposition technique was used to overcome problems arising from the large size of the two-electron integral matrix. It is shown that this approximation reproduces results obtained with the full integral set to a high accuracy, thus opening the possibility to use this approach to perform multiconfigurational wave-function-based quantum chemistry on much larger systems relative to what has been possible until now.

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2008. Vol. 4, no 5, 694-702 p.
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Other Basic Medicine
URN: urn:nbn:se:uu:diva-145678DOI: 10.1021/ct700263hISI: 000255802700003OAI: oai:DiVA.org:uu-145678DiVA: diva2:396629
Available from: 2011-02-10 Created: 2011-02-10 Last updated: 2011-02-25Bibliographically approved

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Aquilante, Francesco
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