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Related Concept Videos

Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

745
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...
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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

2.4K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

577
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...
577
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

22.3K
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...
22.3K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

1.4K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
1.4K
Formation of Complex Ions03:45

Formation of Complex Ions

24.4K
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...
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Related Experiment Video

Updated: Oct 17, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Chelated electrolytes for divalent metal ions.

Pengjian Zuo1, Geping Yin1

  • 1MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.

Science (New York, N.Y.)
|October 7, 2021
PubMed
Summary

Chelating electrolytes restructure ion solvation, paving the way for efficient and reversible magnesium batteries. This breakthrough enhances the performance of next-generation energy storage solutions.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Magnesium batteries offer high theoretical energy density but face challenges with reversible cycling.
  • Ion solvation in electrolytes significantly impacts battery performance and stability.

Purpose of the Study:

  • To investigate the role of chelating electrolytes in magnesium battery performance.
  • To demonstrate the feasibility of reversible magnesium deposition and stripping.

Main Methods:

  • Electrochemical characterization of magnesium-ion electrolytes.
  • In-situ spectroscopic analysis of ion solvation shells.
  • Cycling performance evaluation of magnesium battery cells.

Main Results:

  • Chelating electrolytes were shown to effectively reorganize the solvation structure of magnesium ions.
  • Reversible magnesium deposition and stripping were achieved with high Coulombic efficiency.
  • Improved cycling stability and rate capability of magnesium batteries were observed.

Conclusions:

  • Chelating electrolytes are a promising strategy for enabling high-performance, reversible magnesium batteries.
  • Understanding and controlling ion solvation is critical for advancing magnesium battery technology.