Metal complexes of N-allylaniline. A palladium(II) complex with co-ordination number of greater than four
Abstract
N-Allylaniline (aa) can act as a uni- or bi-dentate ligand in complexes of composition [PdCl2(aa)2] affording an orange-yellow (1) and a dark red isomer (2). The palladium in (1) is four-co-ordinate and planar, with the olefin group unbound in benzene and dimethyl sulphoxide (dmso) solution. The olefin groups in (2) are bound to the palladium, which, in solution (NN-dimethylformamide, dmso, or acetone), is at least five-co-ordinate. Both complexes lose methylacetylene and allene to form trans-[PdCl2(NPhH2)2] on standing in the solid state orinsolution. Isomer (1) requires elevated temperatures and long reaction times, but (2) decomposes readily at room temperature.