期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 135, 期 10, 页码 4018-4026出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja312256u
关键词
-
资金
- NRF/MEST of Korea through CRI
- GRL [2010-00353]
- WCU [R31-2008-000-10010-0]
- United States National Institutes of Health Grant [GM28962]
- [20108010]
- [23750014]
- Grants-in-Aid for Scientific Research [23750014, 20108010] Funding Source: KAKEN
Catalytic four-electron reduction of O-2 by ferrocene (Fc) and 1,1'-dimethylferrocene (Me(2)Fc) occurs efficiently with a dinuclear copper(II) complex [Cu-2(II)(XYLO)(OH)](2+) (1), where XYLO is a m-xylene-linked bis[(2-(2-pyridyl)ethyl)amine] dinucleating ligand with copper-bridging phenolate moiety], in the presence of perchloric acid (HClO4) in acetone at 298 K. The hydroxide and phenoxo group in [Cu-2(II)(XYLO)(OH)](2+) (1) undergo protonation with HClO4 to produce [Cu-2(II)(XYLOH)](4+) (2) where the two copper centers become independent and the reduction potential shifts from -0.68 V vs SCE in the absence of HClO4 to 0.47 V; this makes possible the use of relatively weak one-electron reductants such as Fc and Me(2)Fc, significantly reducing the effective overpotential in the catalytic O-2-reduction reaction. The mechanism of the reaction has been clarified on the basis of kinetic studies on the overall catalytic reaction as well as each step in the catalytic cycle and also by low-temperature detection of intermediates. The O-2-binding to the fully reduced complex [Cu-2(I)(XYLOH)](2+) (3) results in the reversible formation of the hydroperoxo complex ([Cu-2(II)(XYLO)(OOH)](2+)) (4), followed by proton-coupled electron-transfer (PCET) reduction to complete the overall O-2-to-2H(2)O catalytic conversion.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据