title: Metal ion oxidation state assignment based on coordinating ligand hyperfine interaction.
abstract: In exchange-coupled mixed-valence spin systems, the magnitude and sign of the effective ligand hyperfine interaction (HFI) can be useful in determining the formal oxidation state of the coordinating metal ion, as well as provide information about the coordination geometry. This is due to the fact that the observed ligand HFI is a function of the projection factor (Clebsch-Gordon coefficient) that maps the site spin value S i of the local paramagnetic center onto the total spin of the exchange-coupled system, S T. Recently, this relationship has been successfully exploited in identifying the oxidation state of the Mn ion coordinated by the sole nitrogenous ligand to the oxygen-evolving complex in certain states of photosystem II. The origin and evolution of these efforts is described.
authors: Department of Chemistry, University of California-Davis, One Shields Avenue, Davis, CA, 95616, USA.
authors: Paul H
authors: PH
authors: Oyala
authors: Troy A
authors: TA
authors: Stich
authors: R David
authors: RD
authors: Britt
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D007477:Ions; D008024:Ligands; D008670:Metals / Q000378:metabolism*; D010084:Oxidation-Reduction; D045332:Photosystem II Protein Complex / Q000378:metabolism
chemical_list: D007477:Ions; D008024:Ligands; D008670:Metals; D045332:Photosystem II Protein Complex