New Cu(I)-Ethylene
Complexes Based on Tridentate Imine Ligands: Synthesis and Structure
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Abstract
A new
bulky facially coordinating <i>N</i><sub>3</sub>-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)<sub>4</sub>][PF<sub>6</sub>] gave the complex [(<b>1</b>)Cu(NCMe)][PF<sub>6</sub>]. Displacement of the acetonitrile ligand is possible with
CO and C<sub>2</sub>H<sub>4</sub> (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
AgSbF<sub>6</sub> 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
