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相关概念视频

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.3K
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...
26.3K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.0K
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,...
42.0K
Valence Bond Theory02:42

Valence 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
Colors and Magnetism03:02

Colors 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...
11.6K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

20.7K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.7K

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相关实验视频

Updated: Jun 22, 2025

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

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对于小型系统的超细相互作用,包括使用自我相互作用纠正密度函数理论的过渡金属元素.

Anri Karanovich1, Koblar Alan Jackson2, Kyungwha Park1

  • 1Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA.

The Journal of chemical physics
|July 1, 2024
PubMed
概括
此摘要是机器生成的。

使用费米-洛丁轨道基础的自我相互作用纠正密度函数理论研究磁性超细相互作用显示了原子和过渡金属系统的提高准确性. 这种方法比传统的近似方法更好地与实验数据达成一致.

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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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科学领域:

  • 计算化学的计算化学
  • 量子信息科学 量子信息科学
  • 凝聚物质物理学 凝聚物质物理学

背景情况:

  • 磁超精度 (HF) 相互作用对于理解磁性材料和开发量子信息平台至关重要.
  • 准确计算HF相互作用对于这些领域的理论和实验进步至关重要.

研究的目的:

  • 在原子和分子系统中使用基于费米-洛丁轨道 (FLO) 的自我相互作用校正 (SIC) 密度功能理论来研究磁性超细相互作用.
  • 将FLO-SIC的准确性与标准的局部密度近似 (LDA) 和通用梯度近似 (GGA) 方法与实验数据进行比较.

主要方法:

  • 采用了基于费米-洛丁轨道 (FLO) 的自我相互作用校正 (SIC) 的密度功能理论.
  • 计算了原子系统 (Z ≤ 25) 和小分子 (包括Ti和Mn等过渡金属) 的费米接触 (FC) 和自旋双极条款.
  • 将FLO-SIC结果与LDA和GGA计算以及实验数据进行比较.

主要成果:

  • 对于中度重的原子,FLO-SIC 获得了 FC 项的平均绝对误差 27 MHz,远低于 LDA 和 GGA.
  • 对于基于过渡金属的分子,FLO-SIC显示平均绝对误差为59MHz,超过LDA (101MHz) 和GGA (82MHz).
  • 对于非过渡金属分子,FLO-SIC性能与LDA和GGA相当.

结论:

  • 与标准LDA和GGA相比,FLO-SIC密度功能理论为原子和过渡金属系统提供了更准确的磁性超细相互作用预测.
  • 提高FLO-SIC的准确性对于推进量子信息科学和理解磁性特性至关重要.
  • 核心旋转极化可以影响FC条款,导致变化并不总是与从SIC增加旋转密度的预期保持一致.