Photocatalytic generation of a non-heme oxoiron(IV) complex with water as an oxygen source

Abstract

The photocatalytic formation of a non-heme oxoiron(IV) complex, [(N4Py)Fe IV(O)] 2+ [N4Py = N,N-bis(2-pyridylmethyl)-N- bis(2-pyridyl)methylamine], efficiently proceeds via electron transfer from the excited state of a ruthenium complex, [Ru II(bpy) 3] 2+* (bpy = 2,2′-bipyridine) to [Co III(NH 3) 5Cl] 2+ and stepwise electron-transfer oxidation of [(N4Py)Fe II] 2+ with 2 equiv of [Ru III(bpy) 3] 3+ and H 2O as an oxygen source. The oxoiron(IV) complex was independently generated by both chemical oxidation of [(N4Py)Fe II] 2+ with [Ru III(bpy) 3] 3+ and electrochemical oxidation of [(N4Py)Fe II] 2+. © 2011 American Chemical Society.