Molecular Structures for FeS4-/0 As Determined from an ab Initio Study of the Anion Photoelectron Spectra

作者：Van Tan Tran; Hendrickx Marc F A^*

来源：Journal of Physical Chemistry A, 2013, 117(15): 3227-3234.

DOI：10.1021/jp401343j

For the purpose of assigning the photoelectron spectra of the FeS4- molecular entity, geometric and electronic structures of low-lying FeS4-/0 isomers were investigated at the B3LYP, CASPT2, and RCCSD(T) computational quantum chemical levels. The anionic ground state is predicted to be the B-4(1g) state of the D-2h (eta(2)-(S-2))(2)Fe- isomer with two S-2(2-) molecular ligands side-on bond in a D-2h fashion to iron, which has an oxidation state of +3. The experimental photoelectron spectra of FeS4- were successfully assigned as originating from this isomer. The composed lowest energy X band is the result of ionizations to the B-3(3g), B-5(1u), and B-5(1g) states. Analyses of the CASSCF orbitals indicated an almost degeneracy of the nonbonding 3d orbitals of iron and the pi* orbitals of S-2(2-). All the experimental observed higher ionization energy bands could also be theoretically assigned as originating from the proposed anion ground state by detachment of an electron from either of these iron or ligand orbitals.

• 出版日期2013-4-18