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相关概念视频

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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.
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
Intermolecular Forces03:13

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
Electrolytes: van't Hoff Factor03:08

Electrolytes: van't Hoff Factor

Colligative Properties of ElectrolytesThe colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one dissolved...
Common Ion Effect03:24

Common Ion Effect

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
Ion Exchange01:17

Ion Exchange

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 basic...

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相关实验视频

Updated: Jun 30, 2026

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
05:33

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

金属离子体大小在能量和电子转移率中对溶剂分离的1:1[M+] (M+ = Li+,Na+,K+) 离子对的作用.

V A Grigoriev1, D Cheng, C L Hill

  • 1Contribution from the Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA.

Journal of the American Chemical Society
|July 18, 2001
PubMed
概括
此摘要是机器生成的。

阴离子大小显著影响电子转移速率和离子对中的能量. 像这样的较大离子会形成更稳定的离子对,导致更快的电子转移和反应期间的能量变化.

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Spatial Separation of Molecular Conformers and Clusters
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Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique
12:02

Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique

Published on: November 3, 2017

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Last Updated: Jun 30, 2026

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
05:33

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique
12:02

Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique

Published on: November 3, 2017

科学领域:

  • 无机化学 无机化学
  • 电化学 电化学 电化学
  • 物理化学 物理化学

背景情况:

  • 电子转移反应是化学和生物学的基础.
  • 了解离子配对对电子转移的影响对于设计新材料和新工艺至关重要.
  • 聚氧甲酸盐 (POMs) 是多功能无机化合物,具有可调节的氧化还原特性.

研究的目的:

  • 调查阴离子大小 (Li+,Na+,K+) 对聚氧甲酸盐受体电子转移速率和能量的影响.
  • 阐明从有机捐赠体到[(M+) 接受体) ]离子对的电子转移机制和动力学.
  • 建立阳离子大小,离子对形成和电子转移参数之间的相关性.

主要方法:

  • 频谱技术 (NMR,UV-vis) 和气色谱-质谱 (GC-MS) 用于机械研究.
  • 电化学方法 (循环电压测量) 用于确定还原电位.
  • 动力学研究涉及速度数据的同时非线性拟合.
  • 单电位阶段时光度测量以确定有效的水力动力半径.

主要成果:

  • 离子对的形成常数和速率常数随着离子大小 (K+ > Na+ > Li+) 的增加而增加.
  • 电子转移速率常数 (k ((M)))) 随着阴子大小的增加而增加.
  • 对于电子转移的总体自由能量变化,离子配对能量的贡献在较大的阴离子中变得更加显著.
  • 对于所有阴离子-受体复合体,已确定溶剂分离的离子对.

结论:

  • 阴离子大小是一个关键因素,控制了[(M+) ((接受者) ]离子对中电子转移的动力学和热力学.
  • 较大的阴离子稳定离子对,从而提高电子转移速率和改变反应能量.
  • 这些发现为设计基于阴离子选择的定制性质的氧化还原活性系统提供了洞察力.