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相关概念视频

Ionic Bonds00:42

Ionic Bonds

131.4K
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...
131.4K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

49.3K
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. 
49.3K
Bond Polarity, Dipole Moment, and Percent Ionic Character02:48

Bond Polarity, Dipole Moment, and Percent Ionic Character

35.7K
Bond Polarity
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Bonding in Metals02:32

Bonding in Metals

52.6K
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”. 
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

20.2K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
20.2K
Types of Chemical Bonds02:37

Types of Chemical Bonds

94.5K
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. 
94.5K

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相关实验视频

Updated: Feb 9, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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在可见光吸收时形成结合的电离体复合体

Sara A M Wehlin1, Ludovic Troian-Gautier1, Renato N Sampaio1

  • 1Department of Chemistry , University of North Carolina at Chapel Hill , Murray Hall 2202B , Chapel Hill , North Carolina 27599-3290 , United States.

Journal of the American Chemical Society
|June 14, 2018
PubMed
概括
此摘要是机器生成的。

一个新型的离子复合物含有 (II) 复合物和两个离子,在暴露于可见光时形成共价-键. 这一发现对推进太阳能燃料生产技术具有重要意义.

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科学领域:

  • 摄影化学
  • 超分子化学
  • 无机化学

背景情况:

  • (II) 复合物以其光化学性质而闻名.
  • 离子可以参与氧化还原反应并影响激发状态的动态.
  • 对于能源应用来说,了解光诱导的键形成至关重要.

研究的目的:

  • 在可见光激发时研究三离子复合体中的共价I-I键的形成.
  • 为了阐明这种光诱导反应的机制.
  • 评估这一过程对太阳能燃料生产的相关性.

主要方法:

  • 使用了四化Ru (II) 复合物和两个离子在溶液中.
  • 使用了1H NMR,可见吸收光谱和密度功能理论 (DFT) 研究.
  • 进行了斯特恩-沃尔默火实验以分析激发状态的相互作用.

主要成果:

  • 在可见光激发时观察到共价I-I键.
  • 光谱和DFT研究表明两种离子相对于Ru中心的位置不同.
  • 斯特恩-沃尔默火显示上升曲率和和,与多步机制一致.
  • 形成了一种原子中间体,并与配体相关的化物快速反应,在70 ns内产生I2•-.

结论:

  • 离子复合物通过Ru介导的电子转移和随后的原子反应促进了快速的I-I键形成.
  • 反应物离子的超分子组合是这种高效的三离子反应的关键.
  • 这些发现提供了有关太阳能燃料生产的光驱工艺的见解.