非氧铁 (V) 复合物的电子结构对反应性的贡献
在PubMed上查看摘要
概括
此摘要是机器生成的。合成的氧铁复合物,包括[Fe<sup>V</sup>(O) ((OC<sup>O) CH<sub>3</sub>) ][PyNMe<sub>3</sub>]<sup>2+</sup>,并不代表真正的氧铁<sup>V</sup>物种. 相反,它们具有与有机基合的铁 (IV) 中心,解释了它们在C-H和C=C键功能化中的催化活性.
科学领域
- 生物有机化学
- 有机金属化学
- 计算化学
背景情况
- 在里斯克二氧化酶催化过程中,建议使用氧化铁 (V) 种作为中间体.
- 人工模拟物被研究用于C-H和C=C键的功能化,但它们的电子结构尚不清楚.
研究的目的
- 阐明合成氧铁V复合物的电子结构和结构活性关系.
- 为了比较[Fe<sup>V</sup>(O) ((OC) ((O) CH<sub>3</sub>) ((PyNMe<sub>3</sub>) ]<sup>2+</sup> (1) 的电子性质,与已有良好特征的氧铁和相关复合物进行比较.
主要方法
- 基于波函数的多参数完全活动空间自相一致场 (CASSCF) 计算.
- 详细的电子结构和光谱分析.
主要成果
- 铁A矩阵异构性不是氧铁V识别的可靠标记.
- 复合体1表现出一个主导的[Fe<sup>IV</sup>(O··OC(O) CH<sub>3</sup>) <sup>2-•</sup><sup>2+</sup>特征,一个与O-O基结合的铁中心,而不是一个完全分裂的O-O键.
- 复合物4和4-H<sup>+</sup>被描述为与乙胺基结合的三重铁单元.
结论
- 合成复合物1,4和4-H<sup>+</sup>不是真正的氧-铁{V}物种,而是具有激进性质的铁{IV}复合物.
- 复合体1的电子结构,具有部分完整的O-O键,促进了C-H和C=C键的协同二电子氧化,解释了观察到的立体特异性.
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