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Observation of Radical Rebound in a Mononuclear Nonheme Iron Model Complex

A nonheme iron(III) terminal methoxide complex, [Fe III (N3PyO 2Ph )(OCH 3 )]ClO 4 , was synthesized. Reaction of this complex with the triphenylmethyl radical (Ph 3 C • ) leads to formation of Ph 3 COCH 3 and the one-electron-reduced iron(II) center, as seen by UV–vis, EPR,  1 H NMR, and Mössbauer spectroscopy. These results indicate that homolytic Fe–O bond cleavage occurs together with C–O bond formation, providing a direct observation of the “radical rebound” process proposed for both biological and synthetic nonheme iron centers. https://pubs.acs.org/doi/pdf/10.1021/jacs.7b12707 Thomas M. Pangia † ,  Casey G. Davies ‡ ,  Joshua R. Prendergast ‡ § ,  Jesse B. Gordon † ,  Maxime A. Siegler † ,  Guy N. L. Jameson * ‡ §   , and  David P. Goldberg * †   †   Department of Chemistry ,  The Johns Hopkins University ,  Baltimore ,  Maryland   21218 ,  United States ‡   Department of Chemistry and Mac...

A high-valent non heme μ-oxo MnIV dimer generated from a thiolate-bound MnII complex and O2

Authors Deborah Brazzolotto, [a,b] Fabián G. Cantú Reinhard, [c] Julian Smith-Jones, [a] Marius Retegan, [d] Lucia Amidani, [d] Abayomi S. Faponle, [c] Kallol Ray, [e] Christian Philouze, [a] Sam P. de Visser,* [c] Marcello Gennari,* [a] and Carole Duboc* [a]  Accepted manuscript online:  23 May 2017 DOI:  10.1002/anie.201703215 これまで酸素分子の活性化を果たす金属として鉄や銅がよく知られ活発に研究がなされてきました。 この論文では二核non-hem Mn II –thiolate 錯体と酸素との反応を報告しており、 また配位子のチオール部分のプロトンの有無、錯体濃度、O 2 濃度といった簡単な実験条件のチューニングによりdi-μ-oxoまたはμ-oxo-μ-hydroxo Mn IV 錯体の作り分けを可能にしています。