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相关概念视频

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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The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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相关实验视频

Updated: Jun 6, 2025

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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化学键重叠描述符从多配置波函数的化学键重叠描述符.

Carlos V Santos-Jr1, Elfi Kraka2, Renaldo T Moura2,3

  • 1Department of Chemistry, Federal University of Paraiba, João Pessoa, Brazil.

Journal of computational chemistry
|November 28, 2024
PubMed
概括

这项研究将重叠密度 (OP) 和拓描述符 (TOP) 扩展到多配置波函数. OP/TOP分析揭示了化学结合的洞察力,特别是在极性结合和解离过程中.

关键词:
在 LVM 里面,你会看到 LVM.在MCSCF中,MCSCF是最重要的.在QTAIM中,QTAIM是QTAIM.覆盖模型的模型重叠.

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科学领域:

  • 量子化学 是一个量子化学.
  • 化学结合理论 化学结合理论
  • 计算化学计算化学

背景情况:

  • 化学键模型是随着量子力学的发展而来的.
  • 叠加密度和拓描述符为结合提供了洞察力.

研究的目的:

  • 将重叠密度/拓描述符 (OP/TOP) 扩展到多配置的波函数.
  • 使用CASSCF和DCD-CAS(2) 波函数进行OP/TOP描述器的比较.
  • 分析各种分子系统中的化学键.

主要方法:

  • 将OP/TOP描述符应用于多配置波函数的应用.
  • 使用CASSCF和DCD-CAS(2) 方法进行比较分析.
  • 研究X-OH和Li-X'键中的X-O键.

主要成果:

  • OP/TOP分析与已建立的绑定理论 (QTAIM,LVM) 保持一致.
  • 叠加密度转向极键中更多的负电子原子.
  • 在Li-F解离过程中,OP/TOP描述符对离子/中性反转具有敏感性.

结论:

  • OP/TOP描述符为化学键动态提供了有价值的见解.
  • 这种方法增强了对多配置结合的理解.
  • 在各种分子系统中阐明复杂键现象的潜力.