title: Electron capture at the iron-oxygen centre in single crystals of oxymyoglobin studied by electron spin resonance spectroscopy.
abstract: Exposure of single crystals of oxy-myoglobin to 60Co gamma-rays at 77 K results in electron addition to the Fe-O2 units. The resulting ESR spectrum has been analysed to give the principal values and directions for the g-tensor of this unit. The results suggest that the dioxygen ligand is strongly tilted, the direction of tilt being close to one of the bisectors of the N-Fe-N bond angles. Possible reasons for this orientation are discussed.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D003037:Cobalt Radioisotopes; D003461:Crystallography; D004578:Electron Spin Resonance Spectroscopy; D004579:Electron Transport / Q000528:radiation effects; D007501:Iron; D008024:Ligands; D009211:Myoglobin / Q000528:radiation effects; D010100:Oxygen
chemical_list: D003037:Cobalt Radioisotopes; D008024:Ligands; D009211:Myoglobin; C017595:oxymyoglobin; D007501:Iron; D010100:Oxygen