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相关概念视频

Ion Exchange01:17

Ion Exchange

663
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
663
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.8K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.8K
Formation of Complex Ions03:45

Formation of Complex Ions

24.0K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
24.0K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

42.3K
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. 
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.0K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.0K
Qualitative Analysis03:46

Qualitative Analysis

22.6K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
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自组装的阴离子用于在水溶液中识别阳离子.

Yating Wu1, Hua Tang1, Yueyan Kuang1

  • 1Department of Chemistry, Zhejiang University, Hangzhou 310058, China.

Organic letters
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PubMed
概括

合成了两种新型的超分子,分别为三化 (PT3+/MT3+) 和六化 (PH6+/MH6+). 六化酸的子表现出优异的离子识别与 imine 子相比.

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科学领域:

  • 超分子化学 超分子化学
  • 有机合成 有机合成
  • 主机和客人的化学反应

背景情况:

  • 超分子是具有能够结合客分子的内部空洞的分子宿主.
  • 动态共价化学为构建复杂的超分子架构提供了一个强大的途径.
  • 开发具有增强稳定性和离子识别性的子对于传感和分离应用至关重要.

研究的目的:

  • 合成和描述两种类型的超分子子:三化胺 (PT3+/MT3+) 和六化 (PH6+/MH6+).
  • 评估和比较合成的离子识别特性和稳定性.
  • 探索水子子在水性介质中结合高化离子的潜力.

主要方法:

  • 自组装的动态有机反应用于子合成.
  • 对于隔离固态水子子的国外交易.
  • 在水性介质中进行阳离子结合研究,以评估识别能力.

主要成果:

  • 在三化和六化超分子中都获得了高产量.
  • 胺只在溶液中稳定,表现出有限的离子识别能力.
  • 水子体表现出动力惰性,可隔离性,并显著增强了离子结合.
  • 六电离子 (PH6+/MH6+) 具有化物对子,有效地识别了水中的化物,酸盐和硫酸盐离子.

结论:

  • 基于水的六电离子超分子提供了优越的稳定性和离子识别,而不是基于 imine 的三电离子.
  • 合成的六电离子子显示出有望用于感知和分离高度化的离子的应用.
  • 通过动态有机反应进行自我组装,为构建功能超分子宿主提供了一个有效的策略.