Journal of the American Chemical Society, Vol.140, No.12, 4191-4194, 2018
Observation of Radical Rebound in a Mononuclear Nonheme Iron Model Complex
A nonheme iron(III) terminal methoxide complex, [Fe-III(N3PyO2Ph)(OCH3)]ClO4, was synthesized. Reaction of this complex with the triphenylmethyl radical (Ph3C center dot) leads to formation of Ph3COCH3 and the one-electron-reduced iron(II) center, as seen by UV-vis, EPR, H-1 NMR, and Mossbauer spectroscopy. These results indicate that homolytic Fe-O bond cleavage occurs together with C-O bond formation, providing a direct observation of the "radical rebound" process proposed for both biological and synthetic nonheme iron centers.