Stable palladium(0) and palladium( II ) complexes containing a new, multifunctional and semi-labile phosphorus–bisnitrogen ligand

The new, multifunctional, semi-labile phosphorus–bisnitrogen ligand N-(2-diphenylphosphinobenzylidene)-2-(2-pyridyl)ethylamine, PNN, stabilises methyl(chloro)-, η1-ally(chloro)-, dichloro- and bis(tetrafluoroborate)-palladium(II) PNN complexes in a terdentate coordination fashion, resulting in ionic palladium complexes, as well as an unprecedented palladium(0) PNN complex as is evidenced from 1H, 13C, 31P and 15N NMR spectra and an X-ray structural analysis of [(PNN)PdMe]+[Cl]–.