Octahedral ruthenium(II) complexes containing the chiral ligand (4 S)-2-[( Sp)-2-(diphenylphosphino)ferrocenyl]-4-(isopropyl)oxazoline (FcPN). X-Ray crystal structures of fac-[RuCl 2(PMe 3) 2(FcPN)] and fac-[RuCl 2(dppm)(FcPN)] (dppm=bis(diphenylphosphino)methane)

Abstract

Octahedral ruthenium(II) complexes containing the chiral ligand (4 S)-2-[( S p )-2-(diphenylphosphino)ferrocenyl]-4-(isopropyl)oxazoline (FcPN) have been prepared from complex [RuCl 2(PPh 3)(FcPN)] ( 1) via phosphine exchange reactions. Complex 1 reacts with PMe 3, PMe 2Ph, bis(diphenylphosphino)methane (dppm) and 1,2-bis(diphenylphosphino)ethane (dppe) affording in good yield the complexes [RuCl 2L 2(FcPN)] (L=PMe 3 ( 2a), PMe 2Ph ( 2b)) and [RuCl 2(L–L)(FcPN)] (L–L=dppm ( 3a), dppe ( 4)). The processes are stereoselective giving rise to the thermodynamically stable fac isomers. The kinetically controlled formation of the mer isomer [RuCl 2(dppm)(FcPN)] ( 3b) is also described. Structural characterization of the complexes has been carried out by means of 1H-, 31P{ 1H}- and 13C{ 1H}-NMR spectroscopy and the crystal structures of the complexes 2a and 3a have been determined by X-ray diffraction methods.