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Related Concept Videos

Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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: 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...
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...
Masking and Demasking Agents01:19

Masking and Demasking Agents

EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
13:21

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

Published on: July 21, 2011

Macroreticular chelating ion-exchangers.

R F Hirsch1, R E Gancher, F R Russo

  • 1Department of Chemistry, Seton Hall University, South Orange, New Jersey 07079, U.S.A.

Talanta
|June 1, 1970
PubMed
Summary
This summary is machine-generated.

New chelating ion-exchange resins with iminodiacetate and arsonate groups were developed. These resins offer rapid and sharp chromatographic separations, showing selectivities similar to existing commercial options.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Separation Science

Background:

  • Development of novel ion-exchange materials is crucial for advanced separation techniques.
  • Macroreticular chelating ion-exchangers offer unique properties for metal ion binding.

Purpose of the Study:

  • To synthesize and characterize two new macroreticular chelating ion-exchangers.
  • To evaluate their selectivity and chromatographic performance for metal ion separation.

Main Methods:

  • Preparation of macroreticular resins functionalized with iminodiacetate and arsonate groups.
  • Characterization of ion-exchange properties and metal ion selectivity.
  • Chromatographic assessment of separation efficiency and speed.

Main Results:

  • Successful synthesis of iminodiacetate and arsonate functionalized macroreticular resins.
  • Demonstrated metal ion selectivities comparable to commercial chelating resins.
  • Achieved rapid and sharp chromatographic separations using the new resins.

Conclusions:

  • The developed macroreticular chelating ion-exchangers are effective for metal ion separation.
  • These novel resins present a viable alternative to existing commercial options.
  • Their performance indicates potential for various analytical and purification applications.