在Fe (V) 化物中对Jahn-Teller扭曲的EPR,ENDOR和电子结构研究
George E Cutsail1, Benjamin W Stein, Deepak Subedi
1Department of Chemistry Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States.
一个新的低坐标铁化物复合物,一个高氧化状态的模型,表现出Jahn-Teller扭曲. 电子结构计算和ENDOR测量揭示了其结合和反应能力的洞察力,特别是对于质子转移.
科学领域:
- 无机化学 无机化学 有机化学
- 计算化学计算化学
- 频谱学是一种光谱学.
背景情况:
- 低坐标高氧化状态的铁复合体是生物和工业系统的关键模型.
- 合成的铁(V) 化物复合物,[PhB((t) BuIm) 3Fe(V) N](+),呈现一个d(3) 电子配置.
- 这个复合体容易受到Jahn-Teller (JT) 扭曲,这是由于其退化的基本状态.
研究的目的:
- 为了分析低坐标Fe(V) 化物复合物的电子结构.
- 调查正式的伪 Jahn-Teller (PJT) 处理和量子化学计算之间的相互作用.
- 了解JT扭曲对复合体反应能力的影响.
主要方法:
- 扩展的正式的两个轨道伪 Jahn-Teller (PJT) 治疗,包括轨道混合.
- 新型DFT/CASSCF计算方法用于电子结构确定.
- 脉冲35 GHz ENDOR光谱法,以获得化物和联体的高精度和四极张量.
主要成果:
- 该研究揭示了二次性JT扭曲和Fe (V) 化物复合体中显著的e-e混合.
- 恩多尔分析表明一个球形的化物三离子,具有负自旋密度和最小电荷异构性.
- 对边界轨道的计算分析表明,JT诱导的对称性降低促进了质子或H原子的转移.
结论:
- 结合正式处理和先进的计算方法的协同方法,可以更深入地了解复杂的电子结构.
- 铁化复合物作为高氧化状态的有价值模型,对催化有影响.
- JT效应在决定这种低坐标铁化物的反应性方面发挥着关键作用.
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