title: A functional model for the Rieske center: full characterization of a biomimetic N-ligated [2Fe-2S] cluster in different protonation states.
abstract: Give and take both: A bis(benzimidazolate)-capped biomimetic [2Fe-2S] cluster has been characterized in different protonation states, both in the diferric and mixed-valent forms. Protonation does not lead to structural changes of the [2Fe-2S] core, but facilitates its reduction and causes pronounced valence localization in the mixed-valent state. Concerted proton and electron transfer back to the diferric cluster emulates a key step in the function of mitochondrial Rieske proteins (see scheme).
authors.affiliation: Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany.
authors.forename: Antonia
authors.initials: A
authors.lastname: Albers
authors.forename: Thomas
authors.initials: T
authors.lastname: Bayer
authors.forename: Serhiy
authors.initials: S
authors.lastname: Demeshko
authors.forename: Sebastian
authors.initials: S
authors.lastname: Dechert
authors.forename: Franc
authors.initials: F
authors.lastname: Meyer
mesh_terms: D018360:Crystallography, X-Ray; D004578:Electron Spin Resonance Spectroscopy; D005290:Ferric Compounds / Q000737:chemistry*; D007506:Iron-Sulfur Proteins / Q000737:chemistry*; D008956:Models, Chemical; D008968:Molecular Conformation; D015394:Molecular Structure; D013457:Sulfur Compounds / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D007506:Iron-Sulfur Proteins; D013457:Sulfur Compounds
keywords: Mössbauer spectroscopy; bioinorganic chemistry; iron; mixed-valent compounds; sulfur