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Crystal Field Theory - Octahedral Complexes02:58

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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...
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Valence Bond Theory and Hybridized Orbitals02:38

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According to valence bond theory, a covalent bond results when: (1) an orbital on one atom overlaps an orbital on a second atom, and (2) the single electrons in each orbital combine to form an electron pair. The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Maximum overlap is possible when the orbitals overlap on a direct line between the two nuclei.
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
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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,...
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Electronic Structure of Atoms02:28

Electronic Structure of Atoms

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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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Multicompartment models are mathematical constructs that depict how drugs are distributed and eliminated within the body. They segment the body into several compartments, symbolizing various physiological or anatomical areas connected through drug transfer processes such as absorption, metabolism, distribution, and elimination.
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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
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多配置DFT的通用框架

Mickael G Delcey1

  • 1Division of Computational Chemistry, Department of Chemistry, Lund University, SE-221 00 Lund, Sweden.

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概括
此摘要是机器生成的。

多配置对密度函数理论 (MC-PDFT) 为准确描述强相关系统提供了一个有前途的解决方案,改进了现有的密度函数理论 (DFT) 方法.

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科学领域:

  • 计算化学的计算化学
  • 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:

  • 强大的电子相关性对标准密度函数理论 (DFT) 方法构成重大挑战.
  • 现有的方法试图将多配置精度与DFT效率相结合,但往往不足.
  • 需要改进的理论框架来处理强烈相关的电子系统.

研究的目的:

  • 为了证明重构现有方法作为多配置对密度函数理论 (MC-PDFT) 的变体的好处.
  • 介绍这些重构方法的首次实现在一个变化的MC-PDFT框架内.
  • 为强烈相关的系统提供这些方法准确性的系统比较.

主要方法:

  • 在MC-PDFT的变量配方中实施重构方法.
  • 在各种强烈相关的系统中进行系统的准确性评估.
  • 分析形式性质和准确性,以指导未来的功能发展.

主要成果:

  • 许多现有方法在作为MC-PDFT变体重新制定时得到了显著的改进.
  • 通过MC-PDFT的可变配方,这些方法可以得到稳健的实施.
  • 提供了对这些方法在强烈相关的系统上的准确度的第一次系统比较.

结论:

  • MC-PDFT为解决强相关性提供了一个强大而通用的框架.
  • 开发的方法显示了对具有挑战性的电子系统的精度的显著提高.
  • 为开发下一代量子化学函数提供了设计准则.