Electronic structure and intrinsic redox properties of [2Fe-2S]+ clusters with tri- and tetracoordinate iron sites.
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.
Fu
You-Jun
YJ
Department of Physics, Washington State University, 2710 University Drive, Richland, Washington 99352, USA.
Niu
Shuqiang
S
Ichiye
Toshiko
T
Wang
Lai-Sheng
LS
D058085:Iron Compounds / Q000737:chemistry*; D015394:Molecular Structure; D010084:Oxidation-Reduction; D013457:Sulfur Compounds / Q000737:chemistry*; D013816:Thermodynamics
D058085:Iron Compounds; D013457:Sulfur Compounds