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The subject is a debate on the formation mechanism of the environmentally persistent free radicals (EPFR), by interaction of aromatics with transition metal oxides. Literature reports contrasting opinions concerning the stabilization of the phenoxyradicals mainly as concerns the suggested reduction of interacting transition metal centers. The present paper, in accordance with the mechanisms assessed by a number of spectroscopic and computational results, excludes the necessity that the catalytic mechanism involves the reduction of the metal centers by interaction with the aromatics. Graphic Abstract

Reexamining the Formation of Environmentally Persistent Free Radicals from Aromatic Molecules on Metal Oxides