捕获和分析一个Cu(I) 类复合物的兴奋状态结构,通过时间解析衍射和理论计算
Ivan I Vorontsov1, Tim Graber, Andrey Yu Kovalevsky
1Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260, USA.
Journal of the American Chemical Society
|April 22, 2009
概括
铜复合体的光激发 ([Cu(I) ((dmp) ((dppe) ] ((+)) 显示了短暂的三重状态. 结晶矩阵效应限制了与理论计算相比,在时间解析实验中观察到的分子扭曲.
科学领域:
- 无机化学 无机化学
- 摄影化学的使用.
- 固态物理 固态物理
背景情况:
- 铜 (I) 复合物与类和类联体具有光活性.
- 了解光诱导的电子和几何变化对于设计新材料至关重要.
研究的目的:
- 通过光激发来研究[Cu(I) ((dmp) ((dppe) ](+) 的过渡三重状态.
- 分析晶体状态中的几何和电子结构变化.
主要方法:
- 时间分辨率的X射线晶体学 (探头实验).
- 密度函数理论 (DFT) 的计算.
- 电荷密度差异映射. 电荷密度差异映射.
主要成果:
- 由于晶体矩阵约束,实验中的分子扭曲小于计算值.
- 电子转移主要发生在dppe连接体到dmp连接体之间.
- 铜的原子电荷变化很小,但其电子分布发生了显著的变化.
结论:
- 晶体环境显著影响光诱导的结构动力学.
- 激发导致铜复合体内的电子密度重新分配.
- 这些发现提供了对铜 (I) 复合物的光物理学的洞察力.
相关概念视频
02:58Crystal Field Theory - Octahedral Complexes
Crystal Field Theory
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...
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...
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When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.