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由氧活性连接体支持的氧复合物的生成和有氧氧化催化
Maia E Czaikowski1, Andrew J McNeece1, Jan-Niklas Boyn1
1Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States.
Journal of the American Chemical Society
|August 17, 2022
概括
研究人员开发了一种新型的铜复合物,具有氧化还原活性联体,可激活氧气形成催化活性铜-超氧物种. 这种生物启发系统有效地催化了有氧氧化,
科学领域:
- 生物有机化学
- 催化剂
- 有机化学
背景情况:
- 铜系统在生物和合成有氧氧化催化中至关重要.
- 在这些过程中,金属配体的合作性是关键特征.
- 在铜催化氧化过程中,Cu-superoxo物种被认为是重要的中间体.
研究的目的:
- 合成和描述一种能够激活O2的新型铜复合物.
- 在有氧氧化过程中研究得到的Cu-superoxo物种的催化活性.
- 探索生物启发的铜系统在模仿和理解生物氧化转化中的潜力.
主要方法:
- 合成一种新型的铜复合物,其中包括有氧化活性的2,5-bis (((2-t-butylhydrazono)) ((p-tolyl) -methyl) -pyrrole (DHP) 连接物.
- 使用紫外线可见光谱,拉曼同位素标记和Cu扩展X射线吸收细结构 (EXAFS) 进行Cu-O2物种的表征.
- 对酒精和的有氧氧化中的催化活性进行评估.
主要成果:
- 在O2激活时通过联体基电子转移产生了催化活性的Cu (II) - 超氧复合体.
- 光谱和EXAFS分析证实了终端 κ1 超氧物种的形成.
- 该Cu-O2复合物在催化各种基质的有氧氧化过程中表现出有效性.
结论:
- 这种新型的DHP配体促进了功能性Cu- 超氧中间体的形成.
- 这种生物启发的铜复合物既可以作为生物无机中间体的模型,也可以作为活性有氧氧化催化剂.
- 这项研究为铜介导的有氧氧化转化提供了有价值的机理见解.
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