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Related Concept Videos

Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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...
Ligand Binding Sites02:40

Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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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Related Experiment Video

Updated: Jul 3, 2026

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
12:08

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

Charged ligands for catalyst immobilisation and analysis.

Danielle M Chisholm1, J Scott McIndoe

  • 1Department of Chemistry, University of Victoria, P. O. Box 3065, Victoria, BC V8W 3V6, Canada. mcindoe@uvic.ca

Dalton Transactions (Cambridge, England : 2003)
|July 24, 2008
PubMed
Summary
This summary is machine-generated.

Functionalizing ligands in organometallic chemistry with charged groups enhances catalyst solubility and enables immobilization. This approach improves green chemistry metrics and aids in catalyst analysis, offering versatile applications in catalysis.

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Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications
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Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications

Published on: September 23, 2013

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Last Updated: Jul 3, 2026

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
12:08

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications
14:43

Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications

Published on: September 23, 2013

Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Green Chemistry

Background:

  • Ligands in organometallic chemistry are often functionalized away from the binding site.
  • Functionalization serves various purposes, including tuning electronic/steric properties, solubility, chirality, and spectroscopic handles.

Purpose of the Study:

  • Focuses on catalytically active metal complexes with charged or polar peripheral ligand groups.
  • Investigates the impact of these appended groups on catalyst properties and applications.

Main Methods:

  • Synthesis of functionalized ligands for metal complexation.
  • Characterization of the resulting catalytic metal complexes.
  • Evaluation of solubility, immobilization, and analytical capabilities.

Main Results:

  • Charged/polar groups appended to ligands significantly alter catalyst solubility.
  • Facilitates catalyst immobilization in different phases like water or ionic liquids.
  • Enables in situ catalyst analysis via techniques like electrospray ionization mass spectrometry.

Conclusions:

  • Peripheral functionalization of ligands with charged groups is a key strategy for developing greener catalytic processes.
  • Immobilization and enhanced analytical methods improve catalyst recovery and monitoring.
  • This approach broadens the utility of organometallic catalysts.