量化C-HO分子间相互作用的内在强度
Jiří Czernek1, Jiří Brus1, Vladimíra Czerneková2
1Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovsky Square 2, 162 00 Prague, Czech Republic.
Molecules (Basel, Switzerland)
|June 10, 2023
概括
测量C-HO键强度用酸二次体进行量化. 计算显示其内在强度约为O-HO键的四分之一,为分子间相互作用提供了洞察力.
科学领域:
- * 计算化学 计算化学
- * 分子相互作用.
- * 超分子化学
背景情况:
- * C-HO结构图案在分子相互作用中的作用是复杂的,具有破坏稳定和稳定能力.
- * 量化C-HO键的内在强度对于理解它们对分子间环境的贡献至关重要.
- * 由于它们的C2对称性,酸二极体为研究这些相互作用提供了一个模型系统.
研究的目的:
- * 量化C2-对称酸二次体中的C-HO键的内在强度.
- * 为了比较C-HO键的强度与更常见的O-HO键.
- *通过计算分析阐明C-HO和O-HO气结合的性质.
主要方法:
- * 高级合集群理论与单个,双重和扰动三重 [CCSD(T] 计算.
- * 推断到完整的基础集 (CBS) 极限,以准确确定能量.
- * 对称性调整扰动理论 (SAPT) 基于密度函数理论 (DFT) 对单体的处理.
主要成果:
- * C-HO键的内在强度为酸二极体确定.
- *计算显示C-HO相互作用强度大约是O-HO气键强度的25%.
- *SAPT-DFT/CBS的计算表明C-HO和O-HO气结合之间具有相似的性质.
结论:
- * C-HO 键在研究系统中明显弱于 O-HO 键.
- * 这种定量评估为了解C-HO相互作用的贡献提供了一个基准.
- *这些发现有助于更深入地了解分子系统中的非共价相互作用.
更多相关视频
13:58Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
Published on: September 28, 2016
11.8K
10:52Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
12.9K
相关概念视频
Bond Energies and Bond Lengths
25.4K
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.
25.4K
Intermolecular Forces
58.8K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
58.8K
Intermolecular vs Intramolecular Forces
87.8K
Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
87.8K
Spin–Spin Coupling: One-Bond Coupling
1.0K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.0K
Intermolecular Forces and Physical Properties
20.9K
20.9K
Chemical Bonds
16.7K
Atoms participate in a chemical bond formation to acquire a completed valence-shell electron configuration similar to that of the noble gas nearest to it in atomic number. Ionic, covalent, and metallic bonds are some of the important types of chemical bonds. Bond energy and bond length determine the strength of a chemical bond.
Types of Chemical Bonds
An ionic bond is formed due to electrostatic attraction between cations and anions. Often, the ions are formed by the transfer of electrons...
16.7K
