title: A DFT study of the electronic spectrum of the alpha-keggin anion [Co(II)W(12)O(40)](6-).
abstract: Multiplet splittings for several excited configurations of [Co(II)W(12)O(40)](6-) were calculated using DFT methods. In agreement with the experimental interpretation of the spectrum the calculations found that the first strong band corresponds to Co d-d transitions, but it is worth noting that superposed to these transitions there are charge transfer transitions from cobalt to tungsten. The calculations also showed the importance of Jahn-Teller distortions in the excited states. With the exception of the consequences derived from a smaller splitting of d cobalt orbitals the d-d spectrum of [CoCl(4)](2-) is similar to that of the more complex Keggin anion. Finally, the energy of the bielectronic transition (4)A(2) --> (4)T(1)(P) was estimated via an approximate procedure based on ligand field theory.
authors.affiliation: Departament de Química Física i Inorgànica and Institut d'Estudis Avançats, Universitat Rovira i Virgili, Spain.
authors.forename: Joan Miquel
authors.initials: JM
authors.lastname: Maestre
authors.forename: Xavier
authors.initials: X
authors.lastname: Lopez
authors.forename: Carles
authors.initials: C
authors.lastname: Bo
authors.forename: Josep-M
authors.initials: JM
authors.lastname: Poblet
authors.forename: Claude
authors.initials: C
authors.lastname: Daul