Molecular Electrochemistry Hot Paper Probing the Activity of Iron Peroxo Porphyrin Intermediates in the Reaction Layer during the Electrochemical Reductive Activation of O2

Jean-Marc Noel (1) , Nikolaos Kostopoulos (2) , Célia Achaibou (2) , Claire Fave (2) , Elodie Anxolabéhère-Mallart (2) , Frédéric Kanoufi (1)

1 ITODYS (UMR_7086) - Interfaces, Traitements, Organisation et Dynamique des Systèmes
2 LEM (UMR_7591) - Laboratoire d'Electrochimie Moléculaire

Herein we report the first example of using scanning electrochemical microscopy (SECM) to quantitatively analyze O2 reductive activation in organic media catalyzed by three different Fe porphyrins. For each porphyrin, SECM can provide in one single experiment the redox potential of various intermediates, the association constant of Fe II with O2 , and the pK a of the Fe III (OOH-)/ Fe III (OO2-) couple. The results obtained can contribute to a further understanding of the parameters controlling the catalytic efficiency of the Fe porphyrin towards O2 activation and reduction.

Keywords: Electrocatalysis; Iron porphyrins; Molecular electrochemistry; O-O activation; Scanning electrochemical microscopy

Domains: Chemical Sciences; Other; Chemical Sciences; Catalysis; Chemical Sciences; Inorganic chemistry

Jean-Marc Noel, Nikolaos Kostopoulos, Célia Achaibou, Claire Fave, Elodie Anxolabéhère-Mallart, et al.. Molecular Electrochemistry Hot Paper Probing the Activity of Iron Peroxo Porphyrin Intermediates in the Reaction Layer during the Electrochemical Reductive Activation of O2. Angewandte Chemie International Edition, 2020, 59 (38), pp.16376-16380. ⟨hal-02951626⟩