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Extraction: Advanced Methods00:56

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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...
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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...
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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...
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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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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...
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Highly-metallized phosphonium polyelectrolytes.

Amir Rabiee Kenaree1, Bradley M Berven, Paul J Ragogna

  • 1Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, 1151 Richmond St. N., London, Ontario, CanadaN6A 5B7. pragogna@uwo.ca joe.gilroy@uwo.ca.

Chemical Communications (Cambridge, England)
|August 2, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed new metallized, redox-active polyelectrolytes using phosphorus. Pyrolysis of these materials yielded magnetite and other phases, achieving high char yields near 50%.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Development of novel redox-active polymers is crucial for advanced energy storage and electronic applications.
  • Phosphorus-based scaffolds offer unique opportunities for metal integration in polymer backbones.

Purpose of the Study:

  • To synthesize and characterize a new class of highly-metallized, redox-active polyelectrolytes.
  • To investigate the thermal decomposition products of these novel polyelectrolytes.

Main Methods:

  • Synthesis of phosphorus-containing polyelectrolytes.
  • Installation of transition metals onto the phosphorus scaffold.
  • Characterization using spectroscopic and analytical techniques.
  • Pyrolysis of thin films under controlled conditions.

Main Results:

  • Successful synthesis of novel metallized, redox-active polyelectrolytes.
  • Pyrolysis yielded significant amounts (nearly 50%) of char.
  • Produced magnetite crystallites and amorphous carbon-, phosphorus-, and oxygen-rich phases.

Conclusions:

  • The novel polyelectrolytes are promising precursors for producing functional inorganic materials.
  • Phosphorus-based metallized polymers offer a viable route to controlled synthesis of magnetic nanoparticles and composite materials.