SYNTHESIS AND SPECTROSCOPIC CHARACTERIZATION OF BIS(ACETYLACETONATO)(PHOSPHINE)PALLADIUM(II) COMPLEXES

Six new [Pd(acac)2PR3] complexes have been prepared from the reactions of [Pd(acac)2] with PR3 (R = Ph-p-F, Ph-p-Cl, Ph-p-CH3, Ph-p-OCH3, Ph-p-N(CH3)2, cyclohexyl) in diethyl ether at room temperature. Comparisons of UV, IR, H-1 NMR, P-31 NMR and C-13 NMR spectra with those previously reported for [Pd(acac)2(PPh3)] demonstrate that these acetylacetonate complexes all have the structure [Pd(O,O-acac)(gamma-C-acac)(PR3)], in which one acac- ligand is bidentate, coordinated through oxygen atoms, while the other is monodentate, ligand through the gamma-carbon atom.