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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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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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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.
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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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Ion Exchange

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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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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...
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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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A lanthanide complex for metal encapsulations and anion exchanges.

Yan-Qiong Sun1, Fang Wan1, Xin-Xiong Li1

  • 1State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China. stzheng@fzu.edu.cn.

Chemical Communications (Cambridge, England)
|July 28, 2016
PubMed
Summary

This study introduces a novel lanthanide metalloligand that forms a porous, thermochromic material. This material exhibits ion-exchange properties and a unique structural memory effect, allowing for tunable color and temperature responses.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Supramolecular Chemistry

Background:

  • Lanthanide metalloligands are crucial for developing advanced functional materials.
  • Porous materials with tunable properties are highly sought after for various applications.
  • Thermochromic materials offer dynamic visual responses to environmental changes.

Purpose of the Study:

  • To synthesize and characterize a novel cationic lanthanide metalloligand.
  • To investigate the co-assembly of the metalloligand with nitrate into a porous solid.
  • To explore the responsive and memory properties of the resulting material to external stimuli.

Main Methods:

  • Co-assembly of lanthanide metalloligand with nitrate.
  • Characterization of the porous solid using X-ray diffraction and other spectroscopic techniques.
  • Ion-exchange experiments with various cations and anions.
  • Thermochromic property analysis.

Main Results:

  • A porous, thermochromic solid was successfully synthesized through co-assembly.
  • The material demonstrated responsiveness to external cations and anions due to exchangeable nitrate and cation cavities.
  • A notable structural memory effect was observed in the metalloligand even after dissolution and cation binding.
  • Ion-exchange with different anions led to tunable thermochromic temperature and color range.

Conclusions:

  • The developed lanthanide metalloligand forms a versatile porous material with tunable thermochromic properties.
  • The material's responsiveness and structural memory effect highlight its potential for advanced sensing and responsive systems.
  • The ion-exchange capability offers a pathway for fine-tuning material performance for specific applications.