ArticleInorganic chemistry2014
Electron transfer and proton-coupled electron transfer reactivity and self-exchange of synthetic [2Fe-2S] complexes: models for Rieske and mitoNEET clusters.
Article in Inorganic chemistry, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed.
- Review
- Iron-sulfur protein odyssey: exploring their cluster functional versatility and challenging identification.Metallomics : integrated biometal science · 2024Review
- One Electron Changes Everything: Synthesis, Characterization, and Reactivity Studies of [Re(NCCHInorganic chemistry · 2022Article
- [2Fe-2S] Cluster Supported by Redox-ActiveInorganic chemistry · 2021Article
- Proton-Coupled Electron-Transfer Reactivity Controls Iron versus Sulfur Oxidation in Nonheme Iron-Thiolate Complexes.Inorganic chemistry · 2021Article
- Model of the MitoNEET [2Fe-2S] Cluster Shows Proton Coupled Electron Transfer.Journal of the American Chemical Society · 2017Article
- Insight into the Iron-Molybdenum Cofactor of Nitrogenase from Synthetic Iron Complexes with Sulfur, Carbon, and Hydride Ligands.Journal of the American Chemical Society · 2016Review
- Cleavage and polyadenylation specificity factor 30: An RNA-binding zinc-finger protein with an unexpected 2Fe-2S cluster.Proceedings of the National Academy of Sciences of the United States of America · 2016Article
- Redox Control of the Human Iron-Sulfur Repair Protein MitoNEET Activity via Its Iron-Sulfur Cluster.The Journal of biological chemistry · 2016Article
- Moving protons and electrons in biomimetic systems.Biochemistry · 2015Review
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3 authors.
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Abstract
This report describes the thermochemistry, proton-coupled electron transfer (PCET) reactions and self-exchange rate constants for a set of bis-benzimidazolate-ligated [2Fe-2S] clusters. These clusters serve as a model for the chemistry of biological Rieske and mitoNEET clusters. PCET from [Fe2S2((Pr)bbim)((Pr)bbimH)](2-) (4) and [Fe2S2((Pr)bbim)((Pr)bbimH2)](1-) (5) to TEMPO occurs via concerted proton-electron transfer (CPET) mechanisms ((Pr)bbimH2 = 4,4-bis-(benzimidazol-2-yl)heptane). Intermolecular electron transfer (ET) self-exchange between [Fe2S2((Pr)bbim)2](2-) (1) and [Fe2S2((Pr)bbim)2](3-) (2) occurs with a rate constant of (1.20 ± 0.06) × 10(5) M(-1) s(-1) at 26 °C. A similar self-exchange rate constant is found for the related [2Fe-2S] cluster [Fe2S2(SArO)2](2-/3-), SArO(2-) = thiosalicylate. These are roughly an order of magnitude slower than that reported for larger [4Fe-4S] clusters and 1 order of magnitude faster than that reported for N-ligated high-spin iron complexes. These results suggest that the rate of intermolecular ET to/from [Fe-S] clusters is modulated by cluster size. The measured PCET self-exchange rate constant for 1 and 4 at -30 °C is (3.8 ± 0.7) × 10(4) M(-1) s(-1). Analysis of rate constants using the Marcus cross-relation suggests that this process likely occurs via a concerted proton-electron transfer (CPET) mechanism. The implications of these findings to biological systems are also discussed, including the conclusion that histidine-ligated [2Fe-2S] clusters should not have a strong bias to undergo concerted e(-)/H(+) transfers.
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