Mechanistic Investigation of Oxygen Rebound in a Mononuclear Nonheme Iron Complex.
Thomas M PangiaVishal YadavEmilie F GérardYen-Ting LinSam P De VisserGuy N L JamesonDavid P GoldbergPublished in: Inorganic chemistry (2019)
An iron(III) methoxide complex reacts with para-substituted triarylmethyl radicals to give iron(II) and methoxyether products. Second-order rate constants for the radical derivatives were obtained. Hammett and Marcus plots suggest the radical transfer reactions proceed via a concerted process. Calculations support the concerted nature of these reactions involving a single transition state with no initial charge transfer. These findings have implications for the radical "rebound" step invoked in nonheme iron oxygenases, halogenases, and related synthetic catalysts.