Crucial Roles of a Pendant Imidazole Ligand of a Cobalt Porphyrin Complex in the Stoichiometric and Catalytic Reduction of Dioxygen
- 주제(키워드) Acid-Promoted Electron Transfer , Cobalt Porphyrin Complex , Pendant Imidazole Base , Reaction Mechanisms , Reduction of Dioxygen
- 등재 SCIE, SCOPUS
- 발행기관 John Wiley and Sons Inc
- 발행년도 2022
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000193680
- 본문언어 영어
- Published As https://doi.org/10.1002/anie.202208143
초록/요약
A cobalt porphyrin complex with a pendant imidazole base ([(L1)CoII]) is an efficient catalyst for the homogeneous catalytic two-electron reduction of dioxygen by 1,1′-dimethylferrocene (Me2Fc) in the presence of triflic acid (HOTf), as compared with a cobalt porphyrin complex without a pendant imidazole base ([(L2)CoII]). The pendant imidazole ligand plays a crucial role not only to provide an imidazolinium proton for proton-coupled electron transfer (PCET) from [(L1)CoII] to O2 in the presence of HOTf but also to facilitate electron transfer (ET) from [(L1)CoII] to O2 in the absence of HOTf. The kinetics analysis and the detection of intermediates in the stoichiometric and catalytic reduction of O2 have provided clues to clarify the crucial roles of the pendant imidazole ligand of [(L1)CoII] for the first time. © 2022 Wiley-VCH GmbH.
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