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相关概念视频

Valence Bond Theory02:42

Valence Bond Theory

11.2K
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...
11.2K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.6K
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...
30.6K
Colors and Magnetism03:02

Colors and Magnetism

14.0K
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...
14.0K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

48.2K
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,...
48.2K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

26.5K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
26.5K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.9K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
1.9K

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相关实验视频

Updated: Jan 16, 2026

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
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密度矩阵嵌入基于理论的多配置量子化学方法,用于兰他尼德单离子磁铁.

Yuhang Ai1, Ze-Wei Li1, Zhe-Bin Guan1

  • 1Beijing National Laboratory for Molecular Sciences, Institute of Theoretical and Computational Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.

Journal of chemical theory and computation
|September 29, 2025
PubMed
概括

这项研究通过将密度矩阵嵌入理论 (DMET) 与多配置量子化学 (CASSCF-SO) 集成,增强了兰坦化物系统的理论方法. 这种方法提高了研究坦化单离子磁体 (SIM) 的计算效率和准确性.

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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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科学领域:

  • 计算化学计算化学
  • 量子化学 是一个量子化学.
  • 材料科学 材料科学 材料科学

背景情况:

  • 由于4f电子中强烈的电子相关性和相对论效应,从一开始准确地描述兰化物系统的理论描述是具有挑战性的.
  • CASSCF-SO方法是首选用于初始的兰化物研究,但在计算上昂贵.
  • 之前的工作成功地将密度矩阵嵌入理论 (DMET) 与CASSCF-SO集成为3D单离子磁铁 (SIM).

研究的目的:

  • 将DMET+CASSCF-SO方法扩展到兰坦化SIM系统中.
  • 在嵌入式集群空间中通过多引用扰动理论将动态相关性纳入.
  • 开发和验证高效的算法,用于计算兰化物系统的精确电子结构.

主要方法:

  • 密度矩阵嵌入理论 (DMET) 与CASSCF-SO方法的整合.
  • 使用多引用扰动理论包含动态相关性.
  • 为准确的波函数计算制定和应用代子空间 (R-DIIS) 和子空间R-DIIS (sR-DIIS) 算法的规范化直接反转.

主要成果:

  • 增强的DMET + CASSCF-SO方法在兰坦化SIM中显示出极高的精度,与全电子方法相比.
  • 新开发的sR-DIIS算法显示了兰坦化系统的提高效率和稳定性.
  • 该研究验证了基于DMET的方法论对复杂的兰坦化物系统的性能.

结论:

  • 开发的基于DMET的多配置量子化学方法显著提高了对兰坦化物系统的理论研究的准确性和效率.
  • 这种增强的方法预计将促进对复杂的化物基材料 (如单离子磁铁) 的大规模理论研究.
  • 计算方面的进步为更深入地理解和设计新型兰坦化物材料铺平了道路.