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相关概念视频

Halogens03:01

Halogens

23.6K
Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group. 
23.6K
Ionic Bonds00:42

Ionic Bonds

131.0K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
131.0K
Bond Energies and Bond Lengths02:49

Bond Energies and Bond Lengths

31.5K
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.
31.5K
Peptide Bonds02:43

Peptide Bonds

83.1K
A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
83.1K
Bonding in Metals02:32

Bonding in Metals

52.5K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
52.5K
Valence Bond Theory02:45

Valence Bond Theory

50.2K
Overview of Valence Bond Theory
50.2K

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相关实验视频

Updated: Feb 5, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

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

Published on: March 24, 2018

69.6K

溶液中的键不对称性

Sofia Lindblad1,2, Krenare Mehmeti1, Alberte X Veiga1

  • 1Department of Chemistry and Molecular Biology , University of Gothenburg , SE-412 96 Gothenburg , Sweden.

Journal of the American Chemical Society
|September 21, 2018
PubMed
概括
此摘要是机器生成的。

研究人员探索诱导键中的不对称性,类似于键. 他们发现静态不对称是可以实现的,但由于强键的形成,动态交换是不利的,与键不同.

更多相关视频

In Vitro Method to Control Concentrations of Halogenated Gases in Cultured Alveolar Epithelial Cells
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In Vitro Method to Control Concentrations of Halogenated Gases in Cultured Alveolar Epithelial Cells

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Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding
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Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding

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相关实验视频

Last Updated: Feb 5, 2026

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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In Vitro Method to Control Concentrations of Halogenated Gases in Cultured Alveolar Epithelial Cells
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In Vitro Method to Control Concentrations of Halogenated Gases in Cultured Alveolar Epithelial Cells

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Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding
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Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding

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科学领域:

  • 超分子化学
  • 化学结合
  • 计算化学

背景情况:

  • 素结合涉及素原子在非共价相互作用中作为电子受体.
  • 与快速平衡的不对称键 ([D··H··D]+) 不同,类似的键 ([D··X··D]+) 通常表现出静态和对称的几何形状.
  • 素键中的不对称性和动态行为的潜力在很大程度上仍未被探索.

研究的目的:

  • 通过调节电子或硬质因子来研究三中心素键 ([D-X··D]+) 中的非对称感应.
  • 探索静态三中心键转化为快速交换的不对称异构体,反映键的行为.
  • 了解控制素结合复合物的几何和动态的因素.

主要方法:

  • 使用核磁共振 (NMR) 光谱.
  • 使用的分子间潜在能量 (IPE) NMR.
  • 执行密度函数理论 (DFT) 的计算.

主要成果:

  • 证明电子密度的脱对称导致静态的,不对称的素键几何 ([D-X··D]+).
  • 通过计算表明,增加捐赠者-捐赠者距离可以使不对称异构体之间的动态交换 ([D··X-D]+ [D-X··D]+).
  • 由于高能量增益,观察到形成两个静态的对称三中心素键的强烈偏好,而不是动态的非对称形式.

结论:

  • 与结合相比,结合表现出根本不同的二次结合偏好.
  • 通过电子操纵可以实现素键的静态不对称性.
  • 了解电子和硬质影响对于设计改进的转移剂和推进化学结合知识至关重要.