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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

2.9K
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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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.1K
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...
2.1K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

942
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...
942
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

1.1K
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
1.1K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

23.1K
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...
23.1K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

682
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...
682

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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
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Functionalised phosphonate ester supported lanthanide (Ln = La, Nd, Dy, Er) complexes

Ingo Koehne1, Artur Lik, Miriam Gerstel

  • 1Institute of Chemistry and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany. pietschnig@uni-kassel.de.

Dalton Transactions (Cambridge, England : 2003)
|October 23, 2020
PubMed
Summary

New phosphonate ester supported lanthanide complexes were synthesized for semiconductor surface immobilization. These lanthanide complexes exhibit tunable luminescence properties in visible and near-infrared regions, paving the way for advanced material applications.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Luminescence

Background:

  • Lanthanide complexes are crucial for optical and electronic applications.
  • Developing methods for immobilizing these complexes on surfaces is essential for device fabrication.

Purpose of the Study:

  • To synthesize novel phosphonate ester supported lanthanide complexes.
  • To investigate their potential for immobilization on semiconductor surfaces.
  • To characterize their luminescence properties.

Main Methods:

  • Synthesis of six phosphonate ester ligands with varied aromatic groups.
  • Complexation of ligands with lanthanide precursors (La, Nd, Dy, Er).
  • Characterization of synthesized complexes using spectroscopic and analytical techniques.
  • Investigation of luminescence properties in visible and NIR regions.

Main Results:

  • Successful preparation of mono- and dimeric lanthanide complexes.
  • Demonstration of functionalities for surface immobilization.
  • Characterization of 32 distinct complexes.
  • Observation of luminescence in visible and NIR spectral regions.

Conclusions:

  • Phosphonate ester supported lanthanide complexes offer a viable route for surface functionalization.
  • The synthesized complexes exhibit promising luminescence characteristics.
  • These findings support the development of new materials for optoelectronic devices.