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DFT and the electromerism in complexes of iron with diatomic ligands by Radu Silaghi-Dumitrescu; Ioan Silaghi-Dumitrescu is a Chemistry article available to read on EtoBox.

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A reliable procedure is proposed for assigning the electronic structures for large biologically-relevant systems, where the size of the model confines one to the use of density functional theory (DFT) methods, and where the risk of over-interpreting DFT-derived molecular orbitals and spin densities still exists. The proposed approach focuses on the use of the only DFT-derived parameter that is unanimously recognized to be reliable: the geometry. We examine DFT-derived O-O bond lengths in formally ferrous-dioxygen models, and compare them to bond lengths in free, non metal-bound, dioxygen, superoxide and peroxide moieties. Likewise, we compare the N-O bond lengths within ferrous-nitrosyl {FeNO}7 models, with the same parameter in free NO+, NO\*, and HNO species. This allows a calibrated, straightforward way of assigning the electronic structure in systems where electromerism makes detailed single-reference molecular orbital analysis unreliable.

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Author

Radu Silaghi-Dumitrescu; Ioan Silaghi-Dumitrescu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0162-0134)

Published

2006

Language

EN

Field

Chemistry (Physical Sciences)