一个具有几何特征的铁中心的二氧化桥复合体,使得S=3的地面状态升高
Anne K Hickey1, Samuel M Greer2, Juan A Valdez-Moreira1
1Department of Chemistry , Indiana University , 800 East Kirkwood Avenue , Bloomington , Indiana 47405 , United States.
Journal of the American Chemical Society
|July 9, 2019
概括
这项研究详细介绍了一种具有独特铁位点的二元铁化合物. 铁中心之间的铁磁合导致稳定的S=3基本状态,通过光谱学证实.
科学领域:
- 无机化学
- 材料科学
- 光谱学
背景情况:
- 由于其独特的电子和磁性特性,二元铁化合物具有兴趣.
- 了解这种系统中的结构,粘合和磁性合之间的相互作用对于设计新的功能材料至关重要.
研究的目的:
- 描述新型二极体铁化合物的结构和磁性特性 [Ph2B{\tBuIm) 2FeH]2.
- 阐明电子结构和控制观察到的旋转配置和铁磁合的因素.
主要方法:
- 单晶X射线衍射用于结构确定.
- 对探针磁的磁性易感性测量.
- 高频电子磁共振 (HFEPR) 光谱用于电子结构确认.
- 电子结构计算和分子轨道分析.
主要成果:
- 该复合体呈现出一种不寻常的结构,具有四面体铁 (S=2) 位点和正方形平面铁 (S=1) 位点,由两种化物连接.
- 在铁中心之间观察到强烈的铁磁合 (J = +110~12) cm-1,导致总体S=3基态.
- HFEPR光谱和电子结构计算支持拟议的模型和共价合物联体在调节合中的作用.
结论:
- 二元铁复合体显示出独特的自旋配置,由不同的铁碎片的直角对齐引起.
- 强烈的铁磁合归因于桥接合物联体的高度共价性.
- 这项工作提供了对多核金属复合体中磁相互作用的基本原理的见解.
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