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New Cu(I)-ethylene complexes based on tridentate imine ligands: synthesis and structure
Parisa Ebrahimpour1, Mairi F Haddow, Duncan F Wass
1School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
Inorganic Chemistry
|March 19, 2013
Summary
Researchers developed a new N3-donor ligand for copper complexes. These copper(I)-ethylene complexes show reversible ethylene binding, indicating potential for olefin separation and extraction applications.
Area of Science:
- Coordination Chemistry
- Organometallic Chemistry
Background:
- Development of novel ligands is crucial for advancing coordination chemistry and catalysis.
- Facially coordinating N3-donor ligands offer unique steric and electronic properties for metal complexation.
Purpose of the Study:
- To synthesize and characterize a new bulky tach-based N3-donor ligand and its copper(I) complexes.
- To investigate the coordination behavior of these complexes with small molecules like carbon monoxide and ethylene.
- To explore the potential applications of copper(I)-ethylene complexes in olefin separation.
Main Methods:
- Condensation reaction between cis,cis-1,3,5-triaminocyclohexane (tach) and a substituted benzaldehyde to form the N3-donor ligand.
- Complexation of the ligand with copper(I) precursors, followed by characterization using spectroscopic methods.
- Investigation of ligand displacement reactions with CO and C2H4 under varying pressure conditions.
- Preparation and study of copper(I)-ethylene complexes using different ligand systems.
Main Results:
- A new bulky N3-donor ligand, cis,cis-1,3,5-tris(2-fluoro-6-(trifluoromethyl)benzylideneamino)cyclohexane (1), was successfully synthesized.
- Copper(I) complexes with ligand 1 were formed, and acetonitrile ligands could be displaced by CO and C2H4.
- Stable copper(I)-ethylene complexes were prepared using ligands 1 and 2.
- These complexes exhibited reversible ethylene binding under mild pressure changes.
Conclusions:
- The synthesized bulky N3-donor ligands effectively coordinate with copper(I) ions.
- The resulting copper(I)-ethylene complexes demonstrate reversible olefin binding capabilities.
- These findings suggest promising applications for these complexes in selective olefin separation and extraction processes.
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