第三排过渡金属六化物的结构和激发光谱基于多参考精确的两组分理论
Ayaki Sunaga1,2
1ELTE, Eötvös Loránd University, Institute of Chemistry, Pázmány Péter sétány 1/A, 1117 Budapest, Hungary.
Inorganic chemistry
|September 16, 2024
概括
本研究使用先进的计算方法计算了第三排过渡金属六化物的电子结构和激发能. 它揭示了对重元素化学至关重要的联体场分裂和自旋轨道合效应的见解.
科学领域:
- 计算化学是一种计算化学.
- 相对论量子化学 相对论量子化学
- 频谱学是一种光谱学.
背景情况:
- 第三排过渡金属六化物在催化和材料科学中很重要.
- 了解它们的电子结构,特别是旋转轨道合 (SOC) 效应,至关重要,但在计算上具有挑战性.
- 现有的方法可能无法完全捕捉这些沉重系统中的相对论效应.
研究的目的:
- 计算第三排过渡金属六化物 (MF6) 的结构和垂直激发能.
- 调查旋转轨道合 (SOC) 对它们电子性能的影响.
- 为重元素提供在SOC的存在下对联体场分裂的基本理解.
主要方法:
- 使用的通用化-活性空间配置交互 (GASCI) 理论.
- 在相对论计算中使用了精确的二元组件 (X2C) 汉密尔顿式.
- 在Hartree-Fock级别内置的旋转轨道合 (SOC),在旋转器表示中对其进行分析.
主要成果:
- 计算的电子结构和垂直激发能量为M = Re, Os, Ir, Pt, Au, Hg在MF6.
- 在轨道层面分析了SOC效应,提供了对相对论贡献的见解.
- 使用双组理论分配激发光谱,适合SOC受影响的状态.
结论:
- 这项研究提供了对联结体场分裂的基本理解,并结合了SOC.
- 这些发现对于预测和理解重元素化合物的光化学和自旋化学有价值.
- 这项工作推进了过渡金属复合体中相对论效应的计算处理.
相关概念视频
02:58Crystal Field Theory - Octahedral Complexes
26.2K
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...
26.2K
03:02Colors and Magnetism
11.6K
Color in Coordination Complexes
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...
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...
11.6K
02:42Valence Bond Theory
8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.5K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
41.7K
Tetrahedral 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,...
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,...
41.7K
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
1.4K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
1.4K
02:55Exceptions to the Octet Rule
28.0K
Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
28.0K