Studies of β-Diketone Complexes of Rhenium. VIII. The Reaction of β-Diketones with Chloropentacarbonylrhenium(I), and the Preparation of Complexes of the Type Re(CO)₄(dik), Re₂(CO)₆(dik)₂, Re₂(CO)₆Cl₂(dikH)₂, Re(CO)₃L(dik), and Re(CO)₂(dik)L₂

Abstract

The reaction of β-diketones with Re(CO) 5 Cl gave compounds of stoichiometries Re 2 (CO) 6 dik 2 or Re 2 Cl 2 (CO) 6 (dikH) 2 . Reaction of the former compounds with carbon monoxide at high pressure gave Re(CO)4.dik, while with donor ligands such as pyridine or triphenylphosphine they gave compounds of stoichiometry Re(CO) 3 dikL. With triphenylphosphine further reaction gave Re(CO) 2 dik[P(C 6 H 5 ) 3 ] 2 . Compounds were investigated by infrared spectroscopy and mass spectroscopy, and a Cotton–Kraihânzel analysis was made of the carbonyl vibrational spectra in order to get an estimate of the π-acceptor ability of the β-ketoenolate ligands.