title: Electronic structure and intrinsic redox properties of [2Fe-2S]+ clusters with tri- and tetracoordinate iron sites.
abstract: Using potentially bidentate ligands (-SC2H4NH2), we produced [2Fe-2S]+ species of different coordination geometries by fission of [4Fe-4S]2+ complexes. Even though the ligands are monodentate in the cubane complexes, both mono- and bidentate complexes were observed in the [2Fe] fission products through self-assembly because of the high reactivity of the tricoordinate iron sites. The electronic structure of the [2Fe] species was probed using photoelectron spectroscopy and density functional calculations. It was found that tetracoordination significantly decreases the electron binding energies of the [2Fe] complexes, thus increasing the reducing capability of the [2Fe-2S]+ clusters.
authors.affiliation: Department of Physics, Washington State University, 2710 University Drive, Richland, Washington 99352, USA.
authors.forename: You-Jun
authors.initials: YJ
authors.lastname: Fu
authors.forename: Shuqiang
authors.initials: S
authors.lastname: Niu
authors.forename: Toshiko
authors.initials: T
authors.lastname: Ichiye
authors.forename: Lai-Sheng
authors.initials: LS
authors.lastname: Wang
mesh_terms: D058085:Iron Compounds / Q000737:chemistry*; D015394:Molecular Structure; D010084:Oxidation-Reduction; D013457:Sulfur Compounds / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D058085:Iron Compounds; D013457:Sulfur Compounds