由EPR和固态NMR增强的Yb(III) [CH(SiMe3) 2]3的几何和电子结构,通过计算进行了增强
Anton Ashuiev1, Florian Allouche1, Md Ashraful Islam2
1Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1-5, 8093 Zurich, Switzerland. ccoperet@ethz.ch.
这项研究引入了一种结合磁共振光谱学和计算化学的新方法,用于分析偏磁的Ytterbium (III) 复合体. 这些发现揭示了详细的电子结构和几何形状,包括新的二次金属-联结体相互作用.
科学领域:
- 有机金属化学 有机金属化学
- 兰化物化学 兰化物化学
- 光谱学和计算化学的研究.
背景情况:
- 描述类磁性化合物,特别是化物,是一项挑战,通常仅依靠X射线晶体学.
- 兰化物元素由于其部分填充的f-轨道,具有独特的结构和电子特性.
- 现有的方法限制了对这些化合物的详细电子结构信息的访问.
研究的目的:
- 开发和应用一种方法来确定偏磁性伊特 (Ytterbium) 复合体的电子结构和几何.
- 使用先进的技术,研究一个原型的Ytterbium (III) 基复合物,Yb (III) [CH (SiMe3) ] 2 3 .
- 为了提供一个详细的和补充的理解,偏磁性化合物表征.
主要方法:
- 电子磁共振 (EPR) 和固态核磁共振 (NMR) 光谱的联合使用.
- 量子化学计算的应用.
- 测量磁感应度的测量.
主要成果:
- 阐明了Yb(III) 综合体的详细几何和电子结构.
- EPR和NMR签名表明存在三中心两电子Yb-γ-Me-β-Si二次相互作用.
- Yb(III) 电子配置为 4f13 ,具有很大的晶场分裂,导致一个热隔离的地面克莱默斯双.
- 计算数据表明Yb-碳键中的π-字符,类似于α-H杂态相互作用.
结论:
- 通过EPR,NMR和计算方法的综合方法,我们可以全面了解偏磁Yb (III) 复合体.
- 这项研究在三坐标Yb (III) 复合体中发现了新的二次金属-连接体相互作用.
- 这些发现提供了对基复合物的电子结构和结合特征的见解.
更多相关视频
08:04Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
10:42Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
Published on: December 29, 2016
相关概念视频
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Predicting Molecular Geometry
Hybridization of Atomic Orbitals I
Crystal Field Theory - Octahedral Complexes
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Valence Bond Theory
VSEPR Theory and the Basic Shapes
