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1. Substrate-Triggered Formation of a Peroxo-Fe ₂ (III/III) Intermediate during Fatty Acid Decarboxylation by UndA

   https://doi.org/10.1021/jacs.9b06093  

   Zhang, Bo; Rajakovich, Lauren J.; Van Cura, Devon; Blaesi, Elizabeth J.; Mitchell, Andrew J.; Tysoe, Christina R.; Zhu, Xuejun; Streit, Bennett R.; Rui, Zhe; Zhang, Wenjun; et al (September 2019, Journal of the American Chemical Society)

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2. Generation and Reactivity of a Ni ^III ₂ (μ-1,2-peroxo) Complex

   https://doi.org/10.1021/jacs.0c10958  

   Zhao, Norman; Filatov, Alexander S.; Xie, Jiaze; Hill, Ethan A.; Rogachev, Andrey Yu.; Anderson, John S. (December 2020, Journal of the American Chemical Society)

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3. Geometric and electronic structure of a crystallographically characterized thiolate-ligated binuclear peroxo-bridged cobalt(III) complex

   https://doi.org/10.1007/s00775-019-01686-x  

   Dedushko, Maksym A.; Schweitzer, Dirk; Blakely, Maike N.; Swartz, Rodney D.; Kaminsky, Werner; Kovacs, Julie A. (January 2019, JBIC Journal of Biological Inorganic Chemistry)

   In order to shed light on metal-dependent mechanisms for O–O bond cleavage, and its microscopic reverse, we compare herein the electronic and geometric structures of O2-derived binuclear Co(III)– and Mn(III)–peroxo compounds. Binuclear metal peroxo complexes are proposed to form as intermediates during Mn-promoted photosynthetic H2O oxidation, as well as a Co-containing artificial leaf inspired by nature’s photosynthetic H2O oxidation catalyst. Crystallographic characterization of an extremely activated peroxo is made possible by working with substitution-inert, low-spin Co(III). Density functional theory (DFT) calculations show that the frontier orbitals of the Co(III)–peroxo compound differ noticeably from the analogous Mn(III)–peroxo compound. The highest occupied molecular orbital (HOMO) associated with the Co(III)–peroxo is more localized on the peroxo in an antibonding π*(O–O) orbital, whereas the HOMO of the structurally analogous Mn(III)–peroxo is delocalized over both the metal d-orbitals and peroxo π*(O–O) orbital. With low-spin d6 Co(III), filled t2g orbitals prevent π-back-donation from the doubly occupied antibonding π*(O–O) orbital onto the metal ion. This is not the case with high-spin d4 Mn(III), since these orbitals are half-filled. This weakens the peroxo O–O bond of the former relative to the latter. 

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4. A Mononuclear Non-heme Iron(III)–Peroxo Complex with an Unprecedented High O–O Stretch and Electrophilic Reactivity

   https://doi.org/10.1021/jacs.1c03358  

   Zhu, Wenjuan; Jang, Semin; Xiong, Jin; Ezhov, Roman; Li, Xiao-Xi; Kim, Taeyeon; Seo, Mi Sook; Lee, Yong-Min; Pushkar, Yulia; Sarangi, Ritimukta; et al (September 2021, Journal of the American Chemical Society)
5. Isolation of a Terminal Co(III)-Oxo Complex

   https://doi.org/10.1021/jacs.8b07399  

   Goetz, McKenna K.; Hill, Ethan A.; Filatov, Alexander S.; Anderson, John S. (September 2018, Journal of the American Chemical Society)