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相关概念视频

Valence Bond Theory02:42

Valence Bond Theory

11.1K
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...
11.1K
Valence Bond Theory02:45

Valence Bond Theory

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Overview of Valence Bond Theory
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Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

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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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Valence Bond Theory and Hybridized Orbitals02:38

Valence Bond Theory and Hybridized Orbitals

27.5K
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...
27.5K
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

47.6K
sp3d and sp3d 2 Hybridization
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Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

24.8K
According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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多元组件双混合密度的功能理论.

Lukas Hasecke1, Ricardo A Mata1

  • 1Institute of Physical Chemistry, University of Göttingen, Tammannstrasse 6, Göttingen 37077, Germany.

Journal of chemical theory and computation
|November 7, 2025
PubMed
概括
此摘要是机器生成的。

这项研究通过结合Møller-Plesset (MP) 扰动理论来增强多元件密度函数理论 (DFT),用于电子与质子相关. 这种组合显著减少了预测分子能量的错误,提高了化学模拟的准确性.

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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.
  • 理论化学 理论化学

背景情况:

  • 密度函数理论 (DFT) 是电子结构计算的强大工具.
  • 多元件DFT (NEO-DFT) 将DFT扩展到具有轻型移动核的系统.
  • 在DFT中提高电子与质子相关性的准确性仍然是一个挑战.

研究的目的:

  • 通过包括Møller-Plesset (MP) 扰动理论的电子-质子相关能量来研究多元件DFT结果的改进.
  • 通过将DFT与MP2相关性结合起来,开发和参数化新的DFT模型.
  • 评估这些新模型在涉及质子转移的化学系统上的性能.

主要方法:

  • 基于双杂交功能性的三种配方的探索 (B2PLYP,DSD-PBEP86,PBEQIDH).
  • 使用PA23质子结合亲缘关系数据集对DFT/MP2相关能量比的参数化.
  • 对一组可定位分子和特定化学系统 (如质子化水六合体和皇冠分子) 的模型评估.

主要成果:

  • 与标准NEO-DFT相比,NEO-DFT和MP2电子-质子相关的组合将根平均平方偏差 (RMSD) 降低了多达2倍.
  • 大约0.8:0.2的DFT/MP2比率在不同模型和基础集中显示出强有力的改进.
  • 参数化的NEO-B2PLYP模型已成功应用于研究皇冠以太的质子化水六合体和质子动态.

结论:

  • 混合MP2电子-质子相关能量显著提高了多元件DFT计算的准确性.
  • 开发的模型为预测分子能量提供了强大的改进,特别是在具有质子转移的系统中.
  • 这些发现为研究涉及质子的复杂化学现象提供了更准确的计算方法.