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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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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

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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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Metal-Ligand Bonds02:51

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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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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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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
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Complexometric Titration: Overview00:39

Complexometric Titration: Overview

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Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free...
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Electroactive Metal Complexes Covalently Attached to Conductive PEDOT Films: A Spectroelectrochemical Study.

Santiago Rodríguez-Jiménez1,2, Michael S Bennington1,2, Alireza Akbarinejad2,3

  • 1Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand.

ACS Applied Materials & Interfaces
|December 22, 2020
PubMed
Summary

Researchers successfully attached metal complexes to poly(3,4-ethylenedioxythiophene) (PEDOT) films using click chemistry. This immobilization preserves the complexes' electrochromic properties for applications in catalysis and optoelectronics.

Keywords:
X-ray photoelectron spectroscopycovalent immobilization on PEDOTdensity functional theoryspectroelectrochemistrysurface-bound metal complexes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Poly(3,4-ethylenedioxythiophene) (PEDOT) is a conductive polymer with potential applications in various electronic devices.
  • Immobilizing metal complexes onto conductive scaffolds can enhance their stability and facilitate their use in catalysis and sensing.
  • Copper(I)-catalyzed azide alkyne cycloaddition (CuAAC) is a reliable method for covalent functionalization.

Purpose of the Study:

  • To covalently attach alkyne-functionalized nickel(II) and copper(II) macrocyclic complexes onto azide-functionalized PEDOT films.
  • To investigate the surface attachment and properties of these immobilized metal complexes.
  • To evaluate PEDOT films as scaffolds for metal complex immobilization for potential applications.

Main Methods:

  • Electropolymerization of PEDOT and azide-functionalized PEDOT (N and 1:2N) films.
  • Surface functionalization of PEDOT films with metal complexes via copper(I)-catalyzed azide alkyne cycloaddition (CuAAC).
  • Characterization using X-ray photoelectron spectroscopy (XPS), electrochemistry, UV-vis-NIR, and resonance Raman spectroelectrochemistry.
  • Density functional theory (DFT) and time-dependent DFT (TD-DFT) simulations for spectral analysis.

Main Results:

  • Successful covalent immobilization of nickel(II) and copper(II) complexes onto azide-functionalized PEDOT films was confirmed.
  • Surface coverage of immobilized complexes was determined for different PEDOT film compositions (N vs. 1:2N).
  • Copolymerized 1:2N films showed higher conversion rates and lower steric hindrance compared to pristine N films.
  • Spectroelectrochemical behavior of immobilized complexes matched that of free complexes in solution.
  • DFT and TD-DFT simulations showed good agreement with experimental spectroscopic data.

Conclusions:

  • PEDOT films serve as effective conducting scaffolds for the covalent immobilization of metal complexes.
  • The immobilization process preserves the intrinsic electrochromic properties of the metal complexes.
  • This approach is promising for developing advanced materials for electrocatalytic applications (proton and CO2 reduction), optoelectronics, and sensing.