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Related Concept Videos

Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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...
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

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

Complexation Equilibria: Factors Influencing Stability of Complexes

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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EDTA: Chemistry and Properties

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...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Published on: July 27, 2022

Rare-earth metal hydroxylamide complexes.

Ajay Venugopal1, Alexander Hepp, Tania Pape

  • 1Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstr. 30, 48149, Münster, Germany.

Dalton Transactions (Cambridge, England : 2003)
|November 26, 2008
PubMed
Summary
This summary is machine-generated.

New rare-earth metal hydroxylamide compounds were synthesized and characterized. These complexes exhibit side-on coordination of hydroxylamide ligands and dynamic behavior in solution, offering insights into lanthanide chemistry.

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Area of Science:

  • Organometallic Chemistry
  • Rare-Earth Chemistry
  • Coordination Chemistry

Background:

  • Hydroxylamine ligands are versatile in coordination chemistry.
  • Rare-earth metal complexes offer unique electronic and steric properties.

Purpose of the Study:

  • Synthesize and characterize novel rare-earth metal hydroxylamide compounds.
  • Investigate the coordination modes and solution behavior of these complexes.

Main Methods:

  • Silylamide elimination reactions for compound 1 synthesis.
  • Reactions of metal precursors with hydroxylamines for compounds 2a, 2b, and 3.
  • Characterization using multinuclear NMR spectroscopy, elemental analysis, and single-crystal X-ray diffraction.

Main Results:

  • Successfully synthesized Y[N(SiHMe2)2]2[ONBn2][THF] (1), [Cp2Y(ONBn2)]2 (2a), [Cp2Sm(ONBn2)]2 (2b), and Cp5Y3[ON(Me)CH2CH2(Me)NO]2 (3).
  • Observed side-on coordination of hydroxylamide units in all characterized complexes.
  • Determined the dynamic nature of these compounds in solution.

Conclusions:

  • Novel rare-earth metal hydroxylamide complexes with side-on coordination have been prepared.
  • The characterized compounds demonstrate interesting structural and dynamic properties in solution.
  • These findings contribute to the understanding of rare-earth element coordination chemistry.