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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

20.8K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.8K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

369
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
369
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

446
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
446
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

514
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
514
Formation of Complex Ions03:45

Formation of Complex Ions

23.6K
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...
23.6K

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相关实验视频

Updated: Jun 30, 2025

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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在现场构建金属有机复杂接口层使用生物分子使稳定Zn阳极.

Zaifang Yuan1,2, Kaiyuan Zhan1, Di Li1

  • 1College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 401331, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)
|March 21, 2024
PubMed
概括

研究人员开发了一种使用三酸腺 (ATP) 来稳定水性离子电池 (ZIB) 中的阳极的新方法. 这项创新防止了树的生长和副作用,为更安全,更高效的储能铺平了道路.

关键词:
在 Zn 阳极上,有 Zn 阳极腺三酸盐 (ATP) 是一种保护层是一种保护层.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 水性离子电池 (ZIB) 提供安全,低成本和环保的储能解决方案.
  • 商业化受限于阳极树突的生长和副作用.
  • 稳定阳极对于高性能ZIB至关重要.

研究的目的:

  • 开发一个简单的策略,在阳极上在现场建造一个保护性接口层.
  • 提高ZIB中阳极的电化学性能和稳定性.
  • 研究保护层在抑制树形成和副作用的机制.

主要方法:

  • 通过蚀刻在Zn阳极表面上使用腺三酸盐 (ATP) 构建一个多功能膜.
  • 对称电池 (ATP@Zn//ATP@Zn) 的电化学测试,以检测涂层/脱落可逆性.
  • 组装和评估完整的电池 (ATP@Zn//MnO2),以评估实际可行性.

主要成果:

  • 由ATP诱导的界面层增强了脂性,促进了均的Zn2+流量和沉积.
  • 功能介层有效地抑制了腐蚀和进化反应.
  • ATP@Zn 阳极在 5.0 mA cm-2 和 1 mAh cm-2 的电压下,在 2800 多小时内表现出优异的涂层/剥离稳定性.

结论:

  • 腺三酸盐 (ATP) 作为一种有效的代理物,可以在阳极上产生保护性介相.
  • 开发的战略显著提高了水性ZIB中阳极的稳定性和可逆性.
  • 这种方法为高性能和安全的ZIB商业化提供了一个有希望的途径.