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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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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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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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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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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Properties of Organometallic Compounds01:23

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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EDTA: Chemistry and Properties01:22

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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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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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Macrocyclic Polyoxometalates: Selective Polyanion Binding and Ultrahigh Proton Conduction.

Minghui Zhu1, Tsukasa Iwano2, Mengjin Tan1

  • 1MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.

Angewandte Chemie (International Ed. in English)
|February 7, 2022
PubMed
Summary

Researchers developed a novel {Mo22Fe8} macrocycle using the large Preyssler anion ({P5W30}) as a template. This macrocycle demonstrates selective anion binding and enhanced proton conduction, showcasing potential for anion recognition and proton transport applications.

Keywords:
Host-Guest ComplexesHydrogen BondingMacrocyclesPolyoxometalatesProton Conduction

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Area of Science:

  • Supramolecular Chemistry
  • Inorganic Chemistry
  • Materials Science

Background:

  • Anion templation is crucial for macrocycle construction but historically limited to small anions.
  • Large polyoxoanions offer significant structural diversity and numerous binding sites for templation.

Purpose of the Study:

  • To develop a macrocycle using a large polyoxoanion template for enhanced structural diversity.
  • To investigate the anion binding and proton conduction properties of the newly formed macrocycle.

Main Methods:

  • Utilized the Preyssler anion, [NaP5W30O110]14- ({P5W30}), as a supramolecular template.
  • Synthesized and characterized a {Mo22Fe8} macrocycle.
  • Investigated host-guest complex formation and proton transport in both solution and solid states.

Main Results:

  • Successfully formed a {Mo22Fe8} macrocycle templated by the Preyssler anion.
  • The {Mo22Fe8} macrocycle exhibited selective anion binding in solution.
  • A 1:2 host-guest complex showed enhanced proton transport via an extended hydrogen-bonding network compared to a 1:1 complex.

Conclusions:

  • The anion templation strategy using large polyoxoanions is effective for creating complex macrocyclic systems.
  • The {Mo22Fe8} macrocycle holds promise for applications in selective anion recognition.
  • The macrocycle demonstrates potential for efficient proton conduction, particularly in specific host-guest configurations.