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Related Concept Videos

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...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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...
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...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
EDTA: Chemistry and Properties01:22

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...

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Updated: Jun 12, 2026

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
07:20

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

Published on: May 28, 2014

Linear uranium metallocenes with polydentate aromatic nitrogen ligands.

Jean-Claude Berthet1, Jérôme Maynadié, Pierre Thuéry

  • 1CEA, DSM/IRAMIS, UMR 3299 CEA/CNRS SIS2M, 91191, Gif-sur-Yvette, France. jean-claude.berthet@cea.fr

Dalton Transactions (Cambridge, England : 2003)
|June 4, 2010
PubMed
Summary

New linear uranium metallocenes were synthesized using polydentate aromatic nitrogen bases. Researchers also isolated a bent metallocene, expanding the understanding of uranium complex structures.

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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers

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Area of Science:

  • Organometallic Chemistry
  • Uranium Chemistry

Background:

  • Uranium metallocenes are important in various chemical applications.
  • Synthesis of novel uranium complexes with polydentate ligands is an active research area.

Purpose of the Study:

  • To synthesize and characterize new linear and bent uranium metallocenes.
  • To explore the reactivity of uranium complexes with polydentate aromatic nitrogen bases.

Main Methods:

  • Reaction of uranium precursors [Cp*(2)U(NCMe)(5)]X(2) and Cp*(2)UI(2) with phen, terpy, and R(4)btbp ligands in acetonitrile and THF.
  • Isolation and characterization of the resulting uranium metallocenes.
  • X-ray crystal structure determination of selected complexes.

Main Results:

  • Formation of linear uranium metallocenes: [Cp*(2)U(NCMe)(3)(phen)]X(2), [Cp*(2)U(NCMe)(2)(terpy)][BPh(4)](2), [Cp*(2)U(NCMe)(Me(4)btbp)][BPh(4)](2), and [Cp*(2)U(NCMe)(CyMe(4)btbp)][X](2).
  • Isolation of a bent metallocene: [Cp*(2)U(phen)(2)][BPh(4)](2).
  • X-ray crystal structures determined for complexes 2.2MeCN, 3.2THF, and 6'.2MeCN.

Conclusions:

  • The study successfully synthesized novel linear and bent uranium metallocenes.
  • The reactivity of uranium complexes with polydentate nitrogen ligands was demonstrated.
  • Structural characterization provides insights into the coordination chemistry of uranium.