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Probing the Activity of Iron Peroxo Porphyrin Intermediates in the Reaction Layer during the Electrochemical Reductive Activation of O 2
Author(s) -
Noel JeanMarc,
Kostopoulos Nikolaos,
Achaibou Célia,
Fave Claire,
AnxolabéhèreMallart Elodie,
Kanoufi Frédéric
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202004977
Subject(s) - porphyrin , scanning electrochemical microscopy , redox , electrochemistry , catalysis , chemistry , reductive elimination , photochemistry , reaction rate constant , inorganic chemistry , kinetics , electrode , organic chemistry , physics , quantum mechanics
Herein we report the first example of using scanning electrochemical microscopy (SECM) to quantitatively analyze O 2 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 O 2 , and the p K a of the Fe III (OOH − )/ Fe III (OO 2− ) couple. The results obtained can contribute to a further understanding of the parameters controlling the catalytic efficiency of the Fe porphyrin towards O 2 activation and reduction.