The synthesis and structural characterization of [Ru(eta(6)-p-cymene)(eta(2)-TRIPHOS)Cl][PF(6)] is described. The complex is a highly active, homogeneous arene hydrogenation catalyst that is selective toward the hydrogenation of aromatic rings in preference to alkenes, as demonstrated by the hydrogenation of allylbenzene to allylcyclohexane. The catalyst operates in both dichloromethane and ionic liquids and undergoes no decomposition in the latter solvent.

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Copper(I) complexes of the ligand cis-1, 3,5-tris(cinnamylideneamino)cyclohexane (L) have been prepared from a versatile precursor complex, [Cu I (L)NCMe]BF 4 , which incorporates a labile acetonitrile ligand that can be exchanged to give a range of new Cu(L)X complexes (where X = Cl, Br, NO 2 , SPh). 1 H NMR spectra and X-ray structures of the Cl, Br and NO 2 complexes show L coordinated in a symmetric fashion about the copper centre. The complexes have been further characterised using UV/Visible spectroscopy and cyclic voltammetry. CuLCl shows an electrochemically reversible Cu I/II redox couple at 0.51 V (vs. Ag/AgCl) while the CuLNO 2 complex shows an analogous quasi-reversible wave at 0.41 V (vs. Ag/AgCl).

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