Inorganic Chemistry, Vol.47, No.24, 11458-11460, 2008
Proton-Coupled Electron-Transfer Oxidation of Phenols by Hexachloroiridate(IV)
One-electron oxidation of phenol, 2,4,6-trimethylphenol, and 2,6-dimethylphenol by [IrCl6](2-) in aqueous solution has a simple pH dependence, indicating slow bimolecular oxidation of ArOH and faster oxidation of ArO-. HID kinetic isotope effects as large as 3.5 for oxidation of ArOH support concerted proton-coupled electron transfer with water as the proton acceptor.