合成,光谱和结构[FeRu(μ-dithiolate) ((CN) 2(CO) 4]2的结构
Yu Zhang1, Ping Wang1, Shan Xue2
1School of Chemical Sciences, University of Illinois, Urbana, Illinois 61801, United States.
Inorganic chemistry
|October 3, 2023
概括
这项研究合成了新的铁复合体,揭示了[RuFe(μ-pdt) ((CN) 2 ((CO) 4) 2−复合体中独特的"旋转"结构. 这一发现为[FeFe]-基酶的电子状态提供了新的见解.
科学领域:
- 有机金属化学 有机金属化学
- 生物有机化学 生物有机化学
背景情况:
- 不同金属复合物的合成和表征对于理解复杂的催化过程至关重要.
- [FeFe]-酶活性部位对合成模仿物构成独特的结构和电子挑战.
研究的目的:
- 合成和表征新的铁复合体.
- 研究这些复合物的结构和电子性质,特别是[RuFe(μ-pdt) ((CN) 2 ((CO) 4) 2−复合物.
- 将发现与[FeFe]-基酶的活性位点联系起来.
主要方法:
- 合成[K(18-皇冠-6) ]2[Ru(CN) 2(CO) 3和相关的铁复合物.
- 紫外线照射反应与乙醇 (pdtH2).
- X射线晶体学,NMR光谱学,57Fe Mössbauer光谱学,循环电压测量和电子偏磁共振 (EPR).
- 密度函数理论 (DFT) 的计算.
主要成果:
- 合成的cis,cis,cis-[Ru(pdt) ((CN) 2 (((CO) 2) 2−和cis,cis,cis-[Fe (((pdt) ((CN) 2 (((CO) 2) 2−复合体.
- 形成异金属复合物[RuFe(μ-pdt) ((CN) 2 ((CO) 4) 2− ([5] 2−) 具有独特的"旋转"方形金字塔形铁位点.
- 核磁共振 (NMR) 数据显示了Ru位点的立体化学刚性和Fe位点的动态旋转.
- EPR和循环电压测量表明氧化时有一种Ru(II) Fe(I) 电子配置,与[FeFe]-基酶的H_ox状态有关.
- DFT研究支持观察到的结构和光谱,并预测没有同金属类型的旋转结构.
结论:
- [RuFe ((μ-pdt) ((CN) 2 ((CO) 4)) 2−复合体呈现出独特的"旋转"结构,挑战了关于金属位点配置的先前假设.
- 复合物的电子结构,特别是其氧化状态,为[FeFe]-基酶的H_ox状态提供了一个模型.
- 这项研究表明,[FeFe]-基酶的减少状态可能更好地描述为Fe (II) Fe (I) 而不是Fe (I) Fe (I).
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