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Molecular Orbital Theory II03:51

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Stable molecules exist because covalent bonds hold the atoms together. The strength of a covalent bond is measured by the energy required to break it, that is, the energy necessary to separate the bonded atoms. Separating any pair of bonded atoms requires energy — the stronger a bond, the greater the energy required to break it.
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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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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...
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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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    此摘要是机器生成的。

    这项研究引入了一种新方法,用于评估水合体中的键 (H-键) 稳定性,使用分子中的原子量子理论 (QTAIM). 键发生率有效地识别了在分子动态过程中消失的H键.

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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.
    • 分子建模分子建模

    背景情况:

    • 键 (H键) 在分子系统中至关重要,但它们的稳定性,特别是在动态环境中,需要强大的表征.
    • 现有的方法可能无法完全捕捉分子波动期间H键的短暂性质.
    • 水六合体表现出多样化的异构结构 (环,书,,镜),具有不同的H键网络动态.

    研究的目的:

    • 在结构性扰动下研究各种水六合体异构体中键的稳定性.
    • 开发和验证一种基于电子密度分析的新型自动化方法来量化H键稳定性.
    • 提供精细的标准来描述分子系统中的H键消失.

    主要方法:

    • 创建一个数据库的4544电子密度为四个水六合体同体,通过几何扭曲模拟动态行为.
    • 原子在分子中的量子理论 (QTAIM) 用于对电子密度的拓分析的应用.
    • 开发一种新的稳定性度量,即"债券发生率",并使用几何意识的部分异构估计计算其计算的自动化算法 (BondMatcher).

    主要成果:

    • 创建了一个关于扰乱水六相电子密度的综合数据库.
    • 键发生率成功量化了H键稳定性,并确定了缺乏H键路径的电子密度.
    • 拓分析框架证实了实验发现,并完善了H键消失的几何标准.

    结论:

    • 开发的债券发生率和BondMatcher算法提供了一种有效的,自动化的方法来评估H债券的稳定性.
    • 这种方法有助于识别短暂的H键,并为分子动力学提供了洞察力.
    • 这些发现有助于更好地了解分子系统中的H键行为,补充实验观测.