一个Oxo-Iron (IV) 复合物的非经典单一状态反应性,仅限于三重路径
Claudia Kupper1, Bhaskar Mondal2, Joan Serrano-Plana3
1Universität Göttingen , Institut für Anorganische Chemie, Tammannstrasse 4, 37077 Göttingen, Germany.
Journal of the American Chemical Society
|May 31, 2017
概括
这项研究揭示了一种具有四碳联体的新型氧铁 (IV) 复合物,该复合物在C-H键激活中表现出增强的反应性. 该综合体专门使用三重旋转状态进行原子转移,提供纯三重旋转的费里尔模型.
科学领域:
- 生物有机化学
- 有机金属化学
- 催化剂
背景情况:
- 氧铁的C-H键激活是O2-激活酶的关键.
- Fe(IV) =O单元的旋转状态显著影响反应性.
- 了解这些机制对于酶功能和催化剂设计至关重要.
研究的目的:
- 调查C-H激活动力学和四碳联氧铁 (IV) 复合物的理论方面.
- 将其反应性和机制与相关的N-捐赠体结合体进行比较.
- 阐明旋转状态在CH激活途径中的作用.
主要方法:
- 使用不同基质键解离能量的动力学研究.
- 在低温下测量动态同位素效应 (KIE).
- 紫外线光谱和电喷离子质谱 (ESI-MS).
- 理论研究的先进计算方法 (CASSCF/NEVPT2).
主要成果:
- 四碳化合物 [LNHCFeIV(O) ((MeCN) ]2+ (1) 具有较高的反应性,其速率常数比相关的N-供体化合物 (A) 大2-3倍.
- 动力学数据和计算研究表明,对于复合体1的三重表面反应性是独有的.
- 复合体1呈现出一个大的五重三重能量差距,与复合体A不同,该复合体表现出两种状态的反应性.
- 反应通过原子转移 (HAT) 来形成氧铁 (III) 种.
结论:
- 四碳联体在氧铁复合体中显著增强了C-H激活活性.
- 综合体1作为一个独特的模型来研究三重状态原子转移机制.
- 这些发现为控制铁介导的C-H激活的旋转状态效应提供了关键的见解.
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