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MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

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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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VSEPR Theory

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Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure around a central atom from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom form either bonding...
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Effect of Lone Pairs of Electrons on Molecule Geometry
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Overview of Molecular Orbital Theory
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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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多配置短距离上方对密度函数理论.

Frederik Kamper Jørgensen1, Erik Rosendahl Kjellgren1, Hans Jørgen Aagaard Jensen1

  • 1Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark.

The Journal of chemical physics
|January 15, 2025
PubMed
概括

我们介绍了一个新的计算模型,多配置自相一致的顶部对密度函数理论 (MC-srPDFT),它准确地描述了强烈相关的系统. 这种先进的方法克服了以前密度函数理论方法的局限性,改善了分子系统的计算.

科学领域:

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

背景情况:

  • 现有的密度函数理论 (DFT) 方法,包括多配置短距离 DFT (MC-srDFT),面临诸如某些分子状态的自我相互作用错误和不正确的能量退化等挑战.
  • 这些缺陷限制了对强烈相关的电子系统和激发状态的准确描述.

研究的目的:

  • 介绍一个全新的,完全变化的混合模型的理论和实现:多配置的自相一致的顶部对密度函数理论 (MC-srPDFT).
  • 解决和纠正以前的MC-srDFT模型的局限性,特别是关于自我相互作用错误和状态退化.

主要方法:

  • 开发了一个完全可变的混合模型,使用顶部对密度作为辅助变量,取代旋转密度.
  • 采用了上方对密度的长距离版本和第二阶段优化算法,以实现强大的融合.
  • 应用了MC-srPDFT模型来计算各种分子的基态和兴奋状态,包括H2,N2,Cr2和乙烯.

主要成果:

  • MC-srPDFT模型成功地纠正了自我相互作用错误,并确保了不同旋转状态之间的正确退化.
  • 对H2,N2,Cr2和乙烯的计算证明了该模型对基本和激发状态的准确性,包括解离曲线和旋转障碍.
  • 结果显示,对于三重曲线的MS值的选择,结果不变,表明模型的稳定性.

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结论:

  • MC-srPDFT在计算化学方面取得了重大进展,为挑战强相关系系统提供了准确的描述.
  • 该模型克服DFT限制的能力为研究复杂的分子特性和反应开辟了新的可能性.
  • 这项工作确立了MC-srPDFT作为量子化学中基本和激发状态计算的可靠工具.