Journal
COORDINATION CHEMISTRY REVIEWS
Volume 365, Issue -, Pages 41-59Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2018.03.003
Keywords
Amphoteric reactivity; Metal-oxygen complexes; Electrophilic reactions; Nucleophilic reactions; Oxidation mechanism
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Funding
- SENTAN project from JST
- JSPS KAKENHI from MEXT, Japan [16H02268]
- NRF of Korea through CRI [NRF-2012R1A3A2048842]
- NRF of Korea through GRL [NRF-2010-00353]
- NRF of Korea [2017R1D1A1B03029982, 2017R1D1A1B03032615]
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Mononuclear metal-oxygen species, such as metal-superoxo, -peroxo, -hydroperoxo and -oxo complexes, are key intermediates involved in dioxygen activation and oxidation reactions catalyzed by a variety of metalloenzymes and their biomimetic compounds. Dioxygen is an electrophile or electron acceptor, but not a nucleophile or electron donor. However, when dioxygen is bound to metal complexes and metal-oxygen species are formed, such as metal-superoxo,-peroxo,-hydroperoxo, alkylperoxo, and -oxo complexes, the metal-oxygen intermediates react as nucleophiles and electron donors as well as electrophiles and electron acceptors. This review is intended to focus on such an amphoteric reactivity of the metal-oxygen complexes in electrophilic and nucleophilic reactions. Both the electronic and steric effects of the ligands have finely tuned the reactivity of metal-oxygen complexes in both the electrophilic and nucleophilic reactions. The amphoteric reactivity of metal-oxygen complexes can also be tuned by binding of redox-inactive metal ions acting as Lewis acids and also by binding of Brensted acids. (C) 2018 Elsevier B.V. All rights reserved.
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