通过终端连接体替代修饰控制的混合度化物-金属桥梁Fe-Ru-Fe复合体中的不同非局部化范围
Chen Zeng1,2, Qing-Dou Xu1, Xiao-Lin Liu1,2
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P.R. China. tsheng@fjirsm.ac.cn.
Dalton transactions (Cambridge, England : 2003)
|November 1, 2023
概括
这项研究合成了异金属复合体,以探索金属对金属的电荷转移. 这些发现揭示了电荷移位和自旋转移如何根据分子结构和氧化状态而有所不同.
科学领域:
- 无机化学 无机化学
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
背景情况:
- 研究金属对金属的电荷转移 (MMCT) 对于理解分子系统中的电子移位至关重要.
- 桥梁和终端单元对MMCT属性的影响需要在复杂的分子架构中进一步探索.
研究的目的:
- 合成和表征两系列异金属化物-金属桥接复合物.
- 研究桥梁和终端单元之间的相对能量水平对MMCT属性的影响.
- 分析氧化后的电荷移位和旋转转移现象.
主要方法:
- 合成异金属化物-金属桥接复合物:跨-[Cp(dppe) Fe-CN-Ru(MeOpy) 4-NC-Fe(dppe) Cp][X] (1[X]n) 和[Cp*(dppe) Fe-CN-(RuMeOpy) 4-NC-Fe(dppe) Cp*] [X] (2[X]n).
- 结晶学分析以确定结构和氧化位点的特性.
- 电化学和Mössbauer光谱学用于研究电荷移位和电子状态.
主要成果:
- 晶体学表明,对于一个电子的氧化产物 (13+和23+) 在基态中存在不同的氧化位点.
- 电化学和Mössbauer数据显示,电荷在13+. 在整个Fe-Ru-Fe骨干沿着电荷移位.
- 在23+中,电荷移位主要发生在两个Fe-Ru金属部分之间.
- 进一步氧化到N4+ (N=1或2) 诱导了对两个复杂序列的终端单元的旋转转移.
结论:
- 桥梁和终端单元的相对能量水平显著影响异构金属复合体中的电荷移位路径.
- 氧化状态在决定这些分子系统中的电子分布和旋转动态方面发挥着至关重要的作用.
- 合成的复合物作为理解基本MMCT过程的有价值的模型.
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