Journal
NATURE CHEMISTRY
Volume 6, Issue 10, Pages 934-940Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEM.2055
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Funding
- KOSEF/MEST of Korea through the CRI [NRF-2012R1A3A2048842]
- GRL [NRF-2010-00353]
- MSIP of Korea through NRF [2013R1A1A2062737]
- ALCA project from JST
- MEXT of Japan
- US Department of Energy (DOE) Basic Energy Sciences
- National Institutes of Health National Center for Research Resources [P41 RR001209]
- DOE Biological Environmental Research
- National Research Foundation of Korea [2012R1A3A2048842, 2013R1A1A2062737, 2010-00353] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Redox-inactive metal ions that function as Lewis acids play pivotal roles in modulating the reactivity of oxygen-containing metal complexes and metalloenzymes, such as the oxygen-evolving complex in photosystem II and its small-molecule mimics. Here we report the synthesis and characterization of non-haem iron(III)-peroxo complexes that bind redox-inactive metal ions, (TMC) Fe-III-(mu,eta(2):eta(2)-O-2)-Mn+ (Mn+ = Sr2+, Ca2+, Zn2+, Lu3+, Y3+ and Sc3+; TMC, 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane). We demonstrate that the Ca2+ and Sr2+ complexes showed similar electrochemical properties and reactivities in one-electron oxidation or reduction reactions. However, the properties and reactivities of complexes formed with stronger Lewis acidities were found to be markedly different. Complexes that contain Ca2+ or Sr2+ ions were oxidized by an electron acceptor to release O-2, whereas the release of O-2 did not occur for complexes that bind stronger Lewis acids. We discuss these results in the light of the functional role of the Ca2+ ion in the oxidation of water to dioxygen by the oxygen-evolving complex.
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