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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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Valence Bond Theory

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Related Experiment Video

Updated: May 4, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

Rare-Earth-metal methylidene complexes.

Jochen Kratsch¹, Peter W Roesky

¹Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131 Karlsruhe (Germany).

Angewandte Chemie (International Ed. in English)

|January 8, 2014

Summary

This summary is machine-generated.

Rare-earth metal carbene chemistry is an emerging field with high synthetic potential. These alkylidene and methylidene compounds offer new possibilities for organometallic and organic chemistry applications.

Keywords:

carbene lanthanides methylidene rare-earth metals

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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

Published on: April 10, 2015

Area of Science:

Organometallic Chemistry
Catalysis

Background:

Transition-metal carbene complexes are well-established reagents and catalysts in organic synthesis.
Carbene chemistry involving rare-earth metals is significantly less developed but gaining research interest.

Purpose of the Study:

To highlight the emerging field of rare-earth metal carbene chemistry.
To underscore the synthetic potential of rare-earth metal alkylidene and methylidene compounds.

Main Methods:

Literature review and analysis of recent research trends in rare-earth metal carbene chemistry.

Main Results:

Rare-earth metal carbene complexes, particularly alkylidene and methylidene compounds, represent a new class of molecules.
These compounds exhibit significant potential for applications in organometallic chemistry.

Conclusions:

The field of rare-earth metal carbene chemistry is poised for growth.
Rare-earth metal alkylidenes and methylidenes may offer future applications in organic chemistry.