Some Palladium(II) Complexes Containing Both the O-Unidentate β-Diketonato and 2-, 3-, or 4-Pyridyl Ligands. Dynamic Behaviors of trans-[Pd(β-dik-O)(C5H3(6-Cl)N-C2)(PEt3)2] in Solution

Palladium(II) complexes of the [Pd(β-dik-O)(pyridyl)(PEt3)2] type containing an O-unidentate acetylacetonate, trifluoroacetylacetonate, or hexafluoroacetylacetonate anion and a 2-, 3-, 4-pyridyl or 6-chloro-2-pyridyl group as ligands were prepared and characterized mainly by 1H and 13C NMR spectroscopy. The acetylacetonate and hexafluoroacetylacetonate ligands in the [Pd(β-dik-O)(C5H3(6-Cl)N-C2)(PEt3)2] complexes undergo the head-to-tail donor-atom exchange reaction, to which an intramolecular mechanism is proposed.