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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...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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 formed in...
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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...
Complexation Equilibria: Overview01:23

Complexation Equilibria: Overview

Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...
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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Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles
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Published on: June 25, 2018

Competition between ligands for Al2O3 in aqueous solution.

Sabine Desset-Brèthes1, Bernard Cabane, Olivier Spalla

  • 1CEA Saclay, IRAMIS/SIS2M/LIONS-UMR3299, 91191 Gif sur Yvette, France.

The Journal of Physical Chemistry. A
|May 10, 2012
PubMed
Summary

This study reveals how carboxylic ligands adsorb onto α-alumina nanoparticles. Ligand structure, particularly the presence of OH groups and carboxylate spacing, dictates adsorption affinity and competition.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Understanding ligand adsorption on nanoparticles is crucial for applications in catalysis, drug delivery, and materials functionalization.
  • α-alumina nanoparticles are widely used due to their chemical stability and tunable surface properties.

Purpose of the Study:

  • To investigate the adsorption behavior of aliphatic and aromatic carboxylic ligands onto α-alumina nanoparticles.
  • To develop a new methodology for simultaneously analyzing the adsorption of multiple ligands.
  • To identify key molecular features governing ligand affinity and competitive adsorption.

Main Methods:

  • Simultaneous equilibration of two carboxylic ligands with α-alumina nanoparticles.
  • Development of a two-dimensional adsorption representation to distinguish adsorption behaviors.
  • Analysis of ligand competition based on molecular structure and pH.

Main Results:

  • Identified highest affinity ligands including tetracarboxylic acid, citric acid, and tiron.
  • Differentiated between independent, competitive, and mixed adsorption modes.
  • Determined the optimal combination of carbon skeleton and functional groups for high affinity at pH 5.

Conclusions:

  • The presence of an α-positioned hydroxyl (OH) group and the distance between carboxylic groups significantly influence ligand affinity.
  • The study provides insights into designing ligands with tailored adsorption properties for α-alumina surfaces.
  • The developed methodology allows for a nuanced understanding of complex adsorption systems.