Olefin ligands. II. Syntheses of 2,6-diallylpyridine (DAP) complexes of iridium(I), ruthenium(II), palladium(II) and platinum(II); crystal structures of [RuCl2(PPh3)(DAP)] and [PdCl2(DAP)2]

The tridentate ligand 2,6-diallylpyridine (DAP) has been used to synthesize novel complexes [Ir(COD)(DAP)][IrCl2(COD)], [IrCl(CO)(DAP)], [Ir(COD)(DAP)]ClO4, [RuCl2(PPh3)(DAP)], [PdCl2(DAP)2], [PtCl2(DAP)] (COD = 1,5-cyclooctadiene). The mol. structures of [RuCl2(PPh3)(DAP)] and [PdCl2(DAP)2] have been detd. by single-crystal x-ray diffraction studies. In the octahedral Ru complex, DAP acts as a tridentate ligand adopting a mer configuration and the phosphine ligand is trans to the pyridinic N, while in the trans square-planar Pd complex DAP acts as a monodentate N-donor ligand.