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Complexometric Titration: Ligands

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...

Complexation Equilibria: Factors Influencing Stability of Complexes

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: The Chelate Effect

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...

EDTA: Chemistry and Properties

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...

Metal-Ligand Bonds

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 Methods

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...

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Related Experiment Video

Updated: May 19, 2026

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

Improving lanthanide nanocrystal colloidal stability in competitive aqueous buffer solutions using multivalent

Pengpeng Cao¹, Lemuel Tong, Yi Hou

¹Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada, M5S 3H6.

Langmuir : the ACS Journal of Surfaces and Colloids

|August 22, 2012

Summary

Lanthanide nanoparticles show promise as isotopic tags for mass cytometry. A tetraphosphonate polyethylene glycol ligand provides robust colloidal stability in challenging conditions, crucial for bioconjugation.

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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

Published on: January 3, 2018

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Published on: November 10, 2017

Area of Science:

Materials Science
Nanotechnology
Analytical Chemistry

Background:

Lanthanide nanoparticles offer unique properties for various applications.
Mass cytometry requires nanoparticles with specific characteristics like narrow size distribution and robust surface chemistry for isotopic labeling.

Purpose of the Study:

To synthesize and functionalize lanthanide nanoparticles (NaLnF4) for use as isotopic tags in mass cytometry.
To evaluate the colloidal stability of these nanoparticles with different surface modifications under various conditions.

Main Methods:

Synthesis of NaLnF4 nanoparticles (9-11 nm) with oleic acid stabilization.
Surface ligand exchange with mono-, di-, and tetraphosphonate polyethylene glycol (PEG) ligands.
Assessment of colloidal stability using Dynamic Light Scattering (DLS) and Transmission Electron Microscopy (TEM) across a range of pH and phosphate concentrations.

Main Results:

All synthesized PEG-phosphonate ligands yielded stable nanoparticle suspensions in water.
Mono- and diphosphonate PEG ligands failed to stabilize nanoparticles in high pH and phosphate buffer solutions, leading to aggregation.
The tetraphosphonate PEG ligand demonstrated superior stability, maintaining nanoparticle suspension in aggressive solutions for extended periods.

Conclusions:

Tetraphosphonate PEG ligands are effective in stabilizing lanthanide nanoparticles for mass cytometry applications.
Robust surface chemistry is critical for nanoparticle performance in complex biological and chemical environments.
These findings advance the development of lanthanide nanoparticles as reliable isotopic tags.