Metal-dioxygen adducts, such as metal-superoxo and -peroxo species, are key intermediates often detected in the catalytic cycles of dioxygen activation by metalloenzymes and biomimetic compounds. The synthesis and spectroscopic characterization of an end-on nickel(II)-superoxo complex with a 14-membered macrocyclic ligand was reported previously. Here we report the isolation, spectroscopic characterization, and high-resolution crystal structure of a mononuclear side-on nickel(III)-peroxo complex with a 12-membered macrocyclic ligand, [Ni(12-TMC)(O2)]+ (1) (12-TMC = 1,4,7,10-tetramethyl-1,4,7,10-tetraazacyclododecane). In contrast to the end-on nickel(II)-superoxo complex, the nickel(III)-peroxo complex is not reactive in electrophilic reactions, but is capable of conducting nucleophilic reactions. The nickel(III)-peroxo complex transfers the bound dioxygen to manganese(II) complexes, thus affording the corresponding nickel(II) and manganese(III)-peroxo complexes. Our results demonstrate the significance of supporting ligands in tuning the geometric and electronic structures and reactivities of metal–O2 intermediates that have been shown to have biological as well as synthetic usefulness in biomimetic reactions.
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The research was supported by KOSEF/MEST of Korea through the CRI and WCU (R31-2008-000-10010-0) Programs (W.N.), SBS Foundation (W.N.), the Ministry of Education, Culture, Sports, Science and Technology of Japan through the Global COE program and Priority Area (No. 20050029) (T.O.), and NIH grant DK-31450 (E.I.S.). SSRL operations are funded by the Department of Energy, Office of Basic Energy Sciences. The SSRL Structural Molecular Biology program is supported by the National Institutes of Health, National Center for Research Resources, Biomedical Technology Program, and the Department of Energy, Office of Biological and Environmental Research.
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Cho, J., Sarangi, R., Annaraj, J. et al. Geometric and electronic structure and reactivity of a mononuclear ‘side-on’ nickel(iii)–peroxo complex. Nature Chem 1, 568–572 (2009). https://doi.org/10.1038/nchem.366
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