Related Experiment Video
Updated: Mar 28, 2026
10:44
Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
Published on: April 19, 2019
11.8K
NHC-based pincer ligands: carbenes with a bite.
Rhiann E Andrew1, Lucero González-Sebastián1, Adrian B Chaplin1
1Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK. a.b.chaplin@warwick.ac.uk.
Dalton Transactions (Cambridge, England : 2003)
|December 18, 2015
Summary
This study explores N-heterocyclic carbene (NHC)-based pincer complexes, specifically CCC and CNC systems. These systems show promise in various applications, with future research focusing on their development.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Catalysis
Background:
- N-heterocyclic carbenes (NHCs) are versatile ligands in coordination chemistry.
- Pincer complexes offer unique stability and reactivity profiles.
- The combination of NHCs and pincer frameworks creates novel catalytic systems.
Purpose of the Study:
- To provide an overview of NHC-based CCC and CNC pincer systems.
- To discuss the effectiveness of these complexes in various applications.
- To identify future research directions and potential applications.
Main Methods:
- Literature review of NHC-based pincer complexes.
- Analysis of reported applications and catalytic activities.
- Discussion of synthetic strategies and ligand design.
Main Results:
- NHC-based CCC and CNC pincer systems have emerged as a significant class of compounds.
- These systems demonstrate effectiveness in diverse catalytic transformations.
- Key structural features and electronic properties influence their performance.
Conclusions:
- NHC-based pincer complexes represent a rapidly developing area in catalysis.
- Further exploration of their applications and synthetic modifications is warranted.
- These systems hold potential for advancements in sustainable chemistry.
More Related Videos
Related Concept Videos
02:51Metal-Ligand Bonds
25.6K
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...
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...
25.6K
01:19Complexation Equilibria: The Chelate Effect
1.5K
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...
1.5K
00:43Complexometric Titration: Ligands
2.6K
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...
2.6K
01:07Radicals: Electronic Structure and Geometry
5.4K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
5.4K
02:42Valence Bond Theory
11.7K
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...
11.7K
01:18π Molecular Orbitals of the Allyl Cation and Anion
5.9K
An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
5.9K