Transfert réciproque d'oxygéne et d'hydrogéne entre deux ligands coordonnés à une ossature dinucléaire de ruthénium: synthèse et structure moléculaire de Ru₂(CO)₆(μ-PCy₂)[μ-P(O)Cy₂]

Abstract

The dinuclear propionato complexes (Ru₂(CO)₄(μ-O₂CEt)₂(PR₂H)₂ (R = Ph: 1,R = Cy: 2) react under carbon monoxide pressure to give the phosphido complexes Ru₂(CO)₆(μ-PR₂)₂ (R = Ph: 3, R = Cy: 4) as well as the phosphido-phosphinito complexes Ru₂(CO)₆(μ-PR₂)[μ-P(O)R₂] (R = Ph: 5, R = Cy: 6). The simultaneous formation of propionic acid and propionic aldehyde suggests that a H-atom is transferred from the phosphine to the propionato ligand, while an O-atom is transferred from the propionato to the phosphine ligand. The single-crystal X-ray structure analysis of 6 reveals this dinuclear complex to have a 'sawhorse' type structure in which the Ru₂ backbone is bridged by a μ₂-phosphido and a μ₂-phosphinito ligand.