通过Sc3+-peroxo-Fe3+中间体,从O2及其非血红素铁前体中形成Sc3+触发的氧铁 (IV) 形成
Feifei Li1, Katherine M Van Heuvelen, Katlyn K Meier
1Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, Minnesota 55455, United States.
Journal of the American Chemical Society
|June 28, 2013
概括
反氧无活性 (III) 在铁中心激活氧气,形成氧铁 (IV) 复合体. 一种 (III) 过氧铁 (III) 的中间体促进了O-O键裂变,这对于非血红素铁的催化至关重要.
科学领域:
- 生物有机化学 生物有机化学
- 有机金属化学 有机金属化学
- 催化剂是一种催化剂.
背景情况:
- 非血红素铁酶在生物氧化反应中起着至关重要的作用.
- 了解O2激活机制是开发合成催化剂的关键.
- 众所周知,易斯酸会影响金属中心的反应性.
研究的目的:
- 为了研究一个易斯酸,Sc(3+) 在Fe(II) 复合体的O2激活中的作用.
- 为了建模和描述O2激活途径中的潜在中间体.
- 阐明由Sc(3+) 促进的O-O键裂解的机制.
主要方法:
- 使用的Fe (II) (甲基环) [Fe (II) (TMC) ]作为铁复合物.
- 采用Sc(3+) 作为一个易斯酸来触发O2激活.
- 通过使用替代路径生成和特征化了[Fe (III) (η) (2) -O2) (TMC) ] (+) 的一个Sc3+添加物.
- 研究过氧介质转化为氧铁 (IV) 复合物的过程.
主要成果:
- 无氧化还原活性Sc(3+) 成功触发了Fe(II)(TMC) 的O2激活.
- 创建了一个前所未有的[Fe(III) (((η(2) -O2) ((TMC) ] (((+) 添加物与Fe(3+) - ((μ-η(2):η(2) -peroxo) -Sc(3+) 核心.
- 这种过氧中间体被证明可以转化为oxoiron (IV) 复合体.
- 存在的BPh4(-) 促进了作为电子供体的反应.
结论:
- Sc(3+) 作为易斯酸,促进O2激活和O-O键裂变在非血红素铁中心.
- 在这个过程中,特征性Sc(3+) 氧铁(III) 复合物作为一种可行的中间体.
- 这些发现为生物无机化学相关的氧激活的催化机制提供了洞察力.
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