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Related Concept Videos

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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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

22.2K
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...
22.2K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

539
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...
539
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

740
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...
740
Properties of Transition Metals02:58

Properties of Transition Metals

27.8K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
27.8K
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...
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Related Experiment Video

Updated: Oct 16, 2025

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

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When bimetallic oxides and their complexes meet Fenton-like process.

Wenhong Fu1, Jing Yi1, Min Cheng1

  • 1College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, China.

Journal of Hazardous Materials
|October 21, 2021
PubMed
Summary

Bimetallic catalysts enhance heterogeneous Fenton-like reactions for removing organic pollutants. Their synergistic metal effects boost hydrogen peroxide use and catalytic activity, offering stable and efficient contaminant removal.

Keywords:
Hydroxyl radicalMechanismsOrganic contaminantsSynergistic effects

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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

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Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids
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Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids

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Last Updated: Oct 16, 2025

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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

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Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids
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Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids

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Area of Science:

  • Environmental Chemistry
  • Catalysis Science

Background:

  • Heterogeneous Fenton-like reactions are advanced oxidation processes for degrading persistent organic pollutants.
  • Developing efficient, reusable heterogeneous catalysts is crucial for environmental remediation.
  • Bimetallic oxides and complexes show promise as stable, high-performance Fenton-like catalysts across various pH conditions.

Purpose of the Study:

  • To review fundamental mechanisms of Fenton-like reactions.
  • To classify and analyze recent advancements in bimetallic oxide and complex catalysts for Fenton-like processes.
  • To highlight the synergistic effects and performance contributions of different metal combinations.

Main Methods:

  • Literature review and classification of bimetallic catalysts (Fe-based and Fe-free).
  • Analysis of catalyst performance in heterogeneous Fenton-like reactions.
  • Discussion of synergistic mechanisms between metals in bimetallic catalysts.

Main Results:

  • Bimetallic catalysts, particularly those with synergistic metal effects, significantly improve hydrogen peroxide utilization.
  • These catalysts offer enhanced catalytic activity and stability for pollutant degradation.
  • Both Fe-based and Fe-free bimetallic systems demonstrate considerable potential in Fenton-like applications.

Conclusions:

  • Synergistic effects in bimetallic catalysts are key to boosting catalytic performance in Fenton-like reactions.
  • These catalysts provide improved hydrogen peroxide efficiency and accessible active sites.
  • Further research is needed to address current challenges and optimize bimetallic catalyst applications.