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Updated: Jan 17, 2026
09:37
Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
Published on: October 18, 2019
10.1K
N-Heterocyclic silylene complexes of nickel(0).
Eduard Glok1, Luis Werner1, Udo Radius1
1Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. u.radius@uni-wuerzburg.de.
Dalton Transactions (Cambridge, England : 2003)
|September 18, 2025
Summary
This study explores the reactivity of a nickel complex with N-heterocyclic silylene ligands. The complex undergoes ligand substitution with phosphines and N-heterocyclic carbenes, forming new nickel complexes.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Materials Science
Background:
- Nickel complexes are versatile catalysts and building blocks in synthesis.
- N-heterocyclic silylenes are emerging ligands with unique electronic properties.
- Understanding ligand substitution reactions is crucial for designing new metal complexes.
Purpose of the Study:
- To investigate the reactivity of the nickel complex [Ni(Mes2NHSi)2(COD)] with various ligands.
- To synthesize and characterize novel heteroleptic nickel complexes.
- To explore the stability and reactivity of these complexes under different conditions.
Main Methods:
- Synthesis of the nickel complex [Ni(Mes2NHSi)2(COD)].
- Ligand substitution reactions with phosphines, N-heterocyclic carbenes, and carbon monoxide.
- Characterization of the resulting complexes using spectroscopic and analytical techniques.
Main Results:
- Substitution of the COD ligand by phosphines (PMe3, PEt3, PnBu3) and an N-heterocyclic carbene (IMeMe) yielded heteroleptic complexes [Ni(Mes2NHSi)2(L)2].
- Reactions with other N-heterocyclic carbenes (IiPrMe) and carbon monoxide led to complex mixtures, including three- and four-coordinated species and bridged clusters.
- The nickel complex showed limited reactivity towards aryl halides, decomposing with bromides and iodides.
Conclusions:
- The nickel complex [Ni(Mes2NHSi)2(COD)] exhibits selective reactivity, primarily undergoing COD ligand substitution.
- The formation of diverse products highlights the complex coordination behavior of N-heterocyclic silylenes and related ligands.
- The observed reactivity patterns provide insights into the development of novel nickel-based catalytic systems.
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