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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.5K
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...
1.5K
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

3.8K
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...
3.8K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.6K
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...
2.6K
Valence Bond Theory02:42

Valence Bond Theory

11.6K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.6K
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

1.5K
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
1.5K

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Updated: Mar 25, 2026

Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Dynamic ligand-vacancy engineering drives metal dimerization for efficient urea electrooxidation.

Mingjie Wu1, Jian Luo1, Xiaoya Zhan1

  • 1State Key Laboratory of New Textile Materials and Advanced Processing, Wuhan Textile University, Wuhan, China.

Nature Communications
|March 24, 2026
PubMed
Summary
This summary is machine-generated.

A new catalyst strategy uses atomic self-optimization to stabilize materials for the electrochemical urea oxidation reaction. This approach enhances hydrogen generation and nitrogen recycling while improving catalyst durability for sustainable energy.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Energy

Background:

  • Electrochemical urea oxidation offers environmental benefits, including hydrogen generation and nitrogen recycling.
  • Catalyst instability due to surface reconstruction is a significant challenge in urea oxidation.

Purpose of the Study:

  • To develop a novel strategy for catalyst activation and structural preservation in electrochemical urea oxidation.
  • To design self-adaptive catalysts that overcome limitations of surface reconstruction.

Main Methods:

  • Development of a heteronuclear vacancy-to-bond strategy using Fe-doped bimetallic frameworks.
  • Creation of a self-adaptive coordination microenvironment with controllable ligand vacancies and metal dimerization.
  • Spectroscopic analysis and theoretical calculations to elucidate reaction mechanisms.

Main Results:

  • Achieved low potential of 1.222 V @ 10 mA cm⁻² with 87.7% Faradaic efficiency for nitrogen oxides.
  • Reduced C-N cleavage energy and shifted the rate-determining step, lowering overall energy requirements.
  • Demonstrated catalyst stability at 1 A cm⁻² for 100 hours with negligible degradation in industrial-scale electrolyzers.

Conclusions:

  • The vacancy-to-bond strategy enables atomic-level self-optimization for enhanced catalytic activity and structural stability.
  • This approach offers significant energy savings (13%) compared to conventional water splitting.
  • Provides insights into designing adaptive electrocatalysts for sustainable energy applications.