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Electrochemical study of a nonheme Fe(ii) complex in the presence of dioxygen. Insights into the reductive activation of O(2) at Fe(ii) centers
Recent efforts to model the reactivity of iron oxygenases have led to the generation of nonheme Fe(III)(OOH) and Fe(IV)(O) intermediates from Fe(II) complexes and O(2) but using different cofactors. This diversity emphasizes the rich chemistry of nonheme Fe(ii) complexes with dioxygen. We report an...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Royal Society of Chemistry
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5588783/ https://www.ncbi.nlm.nih.gov/pubmed/28936313 http://dx.doi.org/10.1039/c4sc01891e |
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author | Ségaud, Nathalie Anxolabéhère-Mallart, Elodie Sénéchal-David, Katell Acosta-Rueda, Laura Robert, Marc Banse, Frédéric |
author_facet | Ségaud, Nathalie Anxolabéhère-Mallart, Elodie Sénéchal-David, Katell Acosta-Rueda, Laura Robert, Marc Banse, Frédéric |
author_sort | Ségaud, Nathalie |
collection | PubMed |
description | Recent efforts to model the reactivity of iron oxygenases have led to the generation of nonheme Fe(III)(OOH) and Fe(IV)(O) intermediates from Fe(II) complexes and O(2) but using different cofactors. This diversity emphasizes the rich chemistry of nonheme Fe(ii) complexes with dioxygen. We report an original mechanistic study of the reaction of [(TPEN)Fe(II)](2+) with O(2) carried out by cyclic voltammetry. From this Fe(II) precursor, reaction intermediates such as [(TPEN)Fe(IV)(O)](2+), [(TPEN)Fe(III)(OOH)](2+) and [(TPEN)Fe(III)(OO)](+) have been chemically generated in high yield, and characterized electrochemically. These electrochemical data have been used to analyse and perform simulation of the cyclic voltammograms of [(TPEN)Fe(II)](2+) in the presence of O(2). Thus, several important mechanistic informations on this reaction have been obtained. An unfavourable chemical equilibrium between O(2) and the Fe(II) complex occurs that leads to the Fe(III)-peroxo complex upon reduction, similarly to heme enzymes such as P450. However, unlike in heme systems, further reduction of this latter intermediate does not result in O–O bond cleavage. |
format | Online Article Text |
id | pubmed-5588783 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-55887832017-09-21 Electrochemical study of a nonheme Fe(ii) complex in the presence of dioxygen. Insights into the reductive activation of O(2) at Fe(ii) centers Ségaud, Nathalie Anxolabéhère-Mallart, Elodie Sénéchal-David, Katell Acosta-Rueda, Laura Robert, Marc Banse, Frédéric Chem Sci Chemistry Recent efforts to model the reactivity of iron oxygenases have led to the generation of nonheme Fe(III)(OOH) and Fe(IV)(O) intermediates from Fe(II) complexes and O(2) but using different cofactors. This diversity emphasizes the rich chemistry of nonheme Fe(ii) complexes with dioxygen. We report an original mechanistic study of the reaction of [(TPEN)Fe(II)](2+) with O(2) carried out by cyclic voltammetry. From this Fe(II) precursor, reaction intermediates such as [(TPEN)Fe(IV)(O)](2+), [(TPEN)Fe(III)(OOH)](2+) and [(TPEN)Fe(III)(OO)](+) have been chemically generated in high yield, and characterized electrochemically. These electrochemical data have been used to analyse and perform simulation of the cyclic voltammograms of [(TPEN)Fe(II)](2+) in the presence of O(2). Thus, several important mechanistic informations on this reaction have been obtained. An unfavourable chemical equilibrium between O(2) and the Fe(II) complex occurs that leads to the Fe(III)-peroxo complex upon reduction, similarly to heme enzymes such as P450. However, unlike in heme systems, further reduction of this latter intermediate does not result in O–O bond cleavage. Royal Society of Chemistry 2015-01-01 2014-09-16 /pmc/articles/PMC5588783/ /pubmed/28936313 http://dx.doi.org/10.1039/c4sc01891e Text en This journal is © The Royal Society of Chemistry 2014 http://creativecommons.org/licenses/by-nc/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial 3.0 Unported License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Chemistry Ségaud, Nathalie Anxolabéhère-Mallart, Elodie Sénéchal-David, Katell Acosta-Rueda, Laura Robert, Marc Banse, Frédéric Electrochemical study of a nonheme Fe(ii) complex in the presence of dioxygen. Insights into the reductive activation of O(2) at Fe(ii) centers |
title | Electrochemical study of a nonheme Fe(ii) complex in the presence of dioxygen. Insights into the reductive activation of O(2) at Fe(ii) centers
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title_full | Electrochemical study of a nonheme Fe(ii) complex in the presence of dioxygen. Insights into the reductive activation of O(2) at Fe(ii) centers
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title_fullStr | Electrochemical study of a nonheme Fe(ii) complex in the presence of dioxygen. Insights into the reductive activation of O(2) at Fe(ii) centers
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title_full_unstemmed | Electrochemical study of a nonheme Fe(ii) complex in the presence of dioxygen. Insights into the reductive activation of O(2) at Fe(ii) centers
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title_short | Electrochemical study of a nonheme Fe(ii) complex in the presence of dioxygen. Insights into the reductive activation of O(2) at Fe(ii) centers
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title_sort | electrochemical study of a nonheme fe(ii) complex in the presence of dioxygen. insights into the reductive activation of o(2) at fe(ii) centers |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5588783/ https://www.ncbi.nlm.nih.gov/pubmed/28936313 http://dx.doi.org/10.1039/c4sc01891e |
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