Oxidative degradation of toxic organic pollutants by water soluble nonheme iron(iv)-oxo complexes of polydentate nitrogen donor ligands

Abstract

The ability of four mononuclear non-heme iron(IV)-oxo complexes supported by nitrogen donor polydentate ligands in degrading organic pollutants has been investigated. The water soluble iron(II) complexes upon treatment with ceric...

Defluorination of Fluorophenols by a Nonheme Iron(IV)‐Oxo Species: Observation of a New Intermediate Along the Reaction

“…There are a handful of reports in the literature on the oxidative dehalogenation of halophenols by iron complexes, including defluorination and dechlorination processes [6b,10] . Thus, a series of bioinspired water‐soluble iron(IV)‐oxo oxidants were synthesized with nitrogen‐based tetradentate and pentadentate ligands and shown to act as potential catalysts in the oxidative detoxification of a wide range of halophenols [11] . Recently, we have reported a study on the oxidative dehalogenation of a series of mono‐, di‐ and trihalophenols by an iron(IV)‐oxo intermediate supported by the pentadentate 2PyN2Q ligand (2PyN2Q=1,1‐di(pyridin‐2yl)‐ N , N ‐bis(quinolin‐2‐ylmethyl)methanamine) in an acetonitrile solvent [12] .…”

“…[6b,10] Thus, a series of bioinspired water-soluble iron(IV)-oxo oxidants were synthesized with nitrogen-based tetradentate and pentadentate ligands and shown to act as potential catalysts in the oxidative detoxification of a wide range of halophenols. [11] Recently, we have reported a study on the oxidative dehalogenation of a series of mono-, di-and trihalophenols by an iron(IV)-oxo intermediate supported by the pentadentate 2PyN2Q ligand (2PyN2Q = 1,1-di(pyridin-2yl)-N,N-bis(quinolin-2-ylmethyl)methanamine) in an acetonitrile solvent. [12] These studies identified a rate-determining hydrogen atom abstraction from the phenolic OÀ H bond by the iron(IV)-oxo complex from the second-order rate constants.…”

Oxidative dehalogenation of halophenols by high-valent nonheme iron(iv)-oxo intermediates

“…Recently, Paine and co-workers synthesized a series of iron(IV)-oxo complexes supported by polydentate nitrogen-donor ligands which performed the oxidative degradation of halophenols in an aqueous medium. 49 It was observed that water plays a vital role in most of the processes used for the degradation of halophenols. However, all the intermediates might not be stable in aqueous medium.…”