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在dithiolate桥接二铁组件中的电子转移:电催化的演化
Stacey J Borg1, Thomas Behrsing, Stephen P Best
1School of Chemistry, University of Melbourne, 3010 Victoria, Australia.
Journal of the American Chemical Society
|December 23, 2004
概括
一个二铁复合物的电化学还原 (1) 产生了减少的物种,包括一个CO桥接化合物 (1B). 这种复合物 (1) 可以通过电催化减少质子,形成二 (1H2) 并再生催化剂.
科学领域:
- 无机化学 无机化学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 这项研究研究了二铁复合物Fe(2)(mu-pdt)(CO)(6) (1) 的电化学行为,其中pdt是-1,3-dithiolate.
- 了解这些复合物的氧化还原特性和反应性对于开发新的催化剂至关重要.
研究的目的:
- 阐明复杂的电化学还原路径 1.
- 在酸性介质中探索复合物1的电催化质子还原活性.
- 研究一氧化碳 (CO) 对电化学和催化作用的影响.
主要方法:
- 电化学技术包括循环电压测量.
- 频谱方法,如电子磁共振 (EPR),紫外线和扩展X射线吸收细结构 (EXAFS).
- 光谱电化学分析.
主要成果:
- 1的电化学还原最初形成了短暂的一电子还原物种 (1-),随后形成了两电子还原产品,包括一个CO桥接二铁化合物 (1B).
- 复合物1B,配方为[Fe(2) ((mu-S(CH(2)) ((3) SH) ((mu-CO) ((CO) ((6)))),通过光谱学和EXAFS进行了特征,显示Fe-Fe分离为2.527 Å.
- 复合物1通过两电子/质子加法机制催化中等强度酸中的质子减少,产生二 (1H2) 并再生催化剂 (1). 碳化合物抑制了这种催化过程.
结论:
- 复合物1的电化学还原涉及不同的中间物种,并导致形成一种特征性的CO桥接二铁化合物.
- 综合体1显示了用于质子减少的电催化活性,催化循环包括二形成和催化剂再生.
- 一氧化碳起着双重作用,提高复合1电化学的可逆性,但通过副作用反应抑制其质子还原催化.
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