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)5Cl gave compounds of stoichiometries Re2(CO)6dik2 or Re2Cl2(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)3dikL. With triphenylphosphine further reaction gave Re(CO)2dik[P(C6H5)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.