New Cu(I)-Ethylene Complexes Based on Tridentate Imine Ligands: Synthesis and Structure

A new bulky facially coordinating <i>N</i>₃-donor tach-based ligand (tach: <i>cis,cis</i>-1,3,5-triaminocyclohexane) [<b>1</b>: <i>cis,cis</i>-1,3,5-tris­(2-fluoro-6-(trifluoromethyl)­benzylideneamino)­cyclohexane] has been obtained from the condensation of tach with 3 equiv of the appropriate benzaldehyde. Reaction of <b>1</b> with [Cu­(NCMe)₄]­[PF₆] gave the complex [(<b>1</b>)­Cu­(NCMe)]­[PF₆]. Displacement of the acetonitrile ligand is possible with CO and C₂H₄ (3–5 bar). Cu­(I)-ethylene complexes of ligands <b>1</b> and <b>2</b> [<b>2</b>: <i>cis,cis</i>-1,3,5-(mesitylideneamino)­cyclohexane] were prepared successfully by treatment of the ligands with CuBr and AgSbF₆ in the presence of ethylene. These complexes display reversible complexation of the ethylene molecule under mild changes to pressure, suggesting possible application in olefin separation and extraction

New Cu(I)-Ethylene Complexes Based on Tridentate Imine Ligands: Synthesis and Structure

A new bulky facially coordinating <i>N</i>₃-donor tach-based ligand (tach: <i>cis,cis</i>-1,3,5-triaminocyclohexane) [<b>1</b>: <i>cis,cis</i>-1,3,5-tris­(2-fluoro-6-(trifluoromethyl)­benzylideneamino)­cyclohexane] has been obtained from the condensation of tach with 3 equiv of the appropriate benzaldehyde. Reaction of <b>1</b> with [Cu­(NCMe)₄]­[PF₆] gave the complex [(<b>1</b>)­Cu­(NCMe)]­[PF₆]. Displacement of the acetonitrile ligand is possible with CO and C₂H₄ (3–5 bar). Cu­(I)-ethylene complexes of ligands <b>1</b> and <b>2</b> [<b>2</b>: <i>cis,cis</i>-1,3,5-(mesitylideneamino)­cyclohexane] were prepared successfully by treatment of the ligands with CuBr and AgSbF₆ in the presence of ethylene. These complexes display reversible complexation of the ethylene molecule under mild changes to pressure, suggesting possible application in olefin separation and extraction