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相关概念视频

Chemical Bonds02:40

Chemical Bonds

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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...
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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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,...
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Valence Bond Theory

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Overview of Valence Bond Theory
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sp3d and sp3d 2 Hybridization
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Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

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Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
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相关实验视频

Updated: Jul 28, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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一个 - 一个债券.

Timothy Tetrault1, Reagan J Meredith1, Mi-Kyung Yoon1,2

  • 1Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556-5670, USA. aseriann@nd.edu.

Physical chemistry chemical physics : PCCP
|June 5, 2023
PubMed
概括

密度函数理论 (DFT) 对糖类中单键13C-13C自旋合常数 (1JCC) 的计算显示出良好的定性一致性,但在数量上不准确. 为了在MA'AT分析中可靠使用,需要改进.

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科学领域:

  • 碳水化合物化学 碳水化合物化学
  • 计算化学计算化学
  • 频谱学是一种光谱学.

背景情况:

  • 研究了甲基aldohexopyranosides,以评估对自旋合常数的DFT计算的准确性.
  • 准确计算这些常数对于MA'AT分析等先进的分析方法至关重要.

研究的目的:

  • 评估各种DFT模型在计算晶糖中单键13C-13C自旋合常数 (1JCC) 的准确性.
  • 确定当前的DFT方法是否为MA'AT分析中使用的1JCC值提供足够的准确性.

主要方法:

  • 合成和结晶的13C标记的甲基阿尔多赫索皮拉诺化物.
  • 使用固态13CNMR光谱测量了实验1JCC值.
  • 使用五种不同的DFT模型计算1JCC值,并将它们与实验数据进行比较.

主要成果:

  • 所有测试的DFT模型都与实验1JCC值有良好的质量一致.
  • 与实验值相比,计算的1JCC值总是平均高估了4 - 5%.
  • 在任何评估的DFT模型中都没有实现定量准确性.

结论:

  • 当前的DFT计算虽然在质量上有用,但缺乏在MA'AT糖类分析中直接应用所需的定量准确性.
  • 需要在DFT方法中进一步进步,以提高结构分析计算的1JCC值的可靠性.
  • 该研究强调了将计算方法应用于复杂的碳水化合物结构以进行详细的分子分析的局限性.