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Ionic Bonds00:42

Ionic Bonds

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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...
118.7K
Bond Polarity, Dipole Moment, and Percent Ionic Character02:48

Bond Polarity, Dipole Moment, and Percent Ionic Character

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Bond Polarity
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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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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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Molecular Shape and Polarity03:37

Molecular Shape and Polarity

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Dipole Moment of a Molecule
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Types of Chemical Bonds02:37

Types of Chemical Bonds

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Chemical bonding theories were pioneered by American chemist Gilbert N. Lewis. He developed a model called the Lewis model to explain the type and formation of different bonds. Chemical bonding is central to chemistry; it explains how atoms or ions bond together to form molecules. It explains why some bonds are strong and others are weak, or why one carbon bonds with two oxygens and not three; why water is H2O and not H4O. 
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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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导向性的离子键

Illia Hutskalov1, Anthony Linden1, Ilija Čorić1

  • 1Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.

Journal of the American Chemical Society
|April 7, 2023
PubMed
概括
此摘要是机器生成的。

离子键通常是非定向的,可用于空间结构. 这项研究使用屏蔽离子引入了定向离子键,为分子设计提供了非共价相互作用的替代方案.

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科学领域:

  • 化学学
  • 材料科学
  • 超分子化学

背景情况:

  • 共价键和离子键是基本的原子相互作用.
  • 传统的离子键缺乏方向性,限制了它们在空间结构中的使用.
  • 像键这样的非共价相互作用对分子组织至关重要.

研究的目的:

  • 引入一种创建定向离子键的方法.
  • 探索这些定向离子键作为非共价相互作用的替代品的潜力.
  • 通过离子相互作用使有机分子和材料的空间结构成为可能.

主要方法:

  • 在充电位点周围设计形非极性盾.
  • 调查这种屏蔽产生的可预测的方向方向.
  • 评估它们在有机分子和材料结构中的适用性.

主要成果:

  • 证明了离子键的可预测方向.
  • 展示了非极性屏蔽如何赋予离子相互作用的方向性.
  • 建立了定向离子键作为分子和材料结构的可行替代方案.

结论:

  • 可以通过屏蔽充电点来实现定向离子键.
  • 这些工程离子键为空间组织提供了一种新的方法.
  • 这为设计有机分子和先进材料提供了新的工具.