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Related Concept Videos

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...
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...
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...
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...
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...

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

Published on: July 21, 2011

Bifunctional chelates for metal nuclides.

M W Brechbiel1

  • 1Radioimmune and Inorganic Chemistry Section, Radiation Oncology Branch, National Cancer Institute, Bethesda, MD, USA. martinwb@mail.nih.gov

The Quarterly Journal of Nuclear Medicine and Molecular Imaging : Official Publication of the Italian Association of Nuclear Medicine (AIMN) [And] the International Association of Radiopharmacology (IAR), [And] Section of the Society Of
|November 29, 2007
PubMed
Summary

Non-standard metallic radionuclides are increasingly used for medical imaging and therapy. Effective chelation chemistry is crucial for securely attaching these radioactive metals to molecules for targeted delivery.

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

  • Radiochemistry
  • Nuclear Medicine
  • Materials Science

Background:

  • The application of non-standard metallic radionuclides in medicine is a growing area of research.
  • These radionuclides are being explored for diagnostic and therapeutic purposes across various molecular targets, including small molecules, peptides, proteins, and nanoparticles.
  • Successful implementation relies heavily on robust methods for radionuclide sequestration.

Purpose of the Study:

  • To provide an overview of available chelation chemistry options for metallic radionuclides.
  • To guide researchers in selecting appropriate chelation strategies for specific applications.
  • To highlight the importance of chelation in radiolabeling for medical uses.

Main Methods:

  • Review of existing literature on chelation chemistry for metallic radionuclides.
  • Categorization of different chelation approaches based on radionuclide and application.
  • Discussion of factors influencing the selection of chelating agents.

Main Results:

  • A range of chelation chemistry options are available for researchers.
  • The choice of chelation strategy depends on the specific radionuclide and the targeted biomolecule or nanoparticle.
  • Proper chelation ensures the stable attachment of the radionuclide for effective diagnostic or therapeutic outcomes.

Conclusions:

  • Appropriate chelation chemistry is essential for the successful use of non-standard metallic radionuclides in medicine.
  • Researchers must carefully consider application requirements when selecting chelation methods.
  • Advances in chelation chemistry will further expand the utility of metallic radionuclides in healthcare.