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

Article abstract of DOI:10.1016/0022-328X(87)85202-6

The tridentate ligand 2,6-diallylpyridine (DAP) has been used to synthesize novel complexes of iridium(I), ruthenium(II), palladium(II) and platinum(II) of formulae , , ClO4, , PdCl2(DAP)2>, .All the complexes have been characterized by elemental analysis.IR, and 1H NMR spectroscopy.The molecular structures of and have been determined by single-crystal X-ray diffraction studies.Crystals of the ruthenium complex are orthorhombic, space group Pbca, with Z=8 in a unit cell of dimensions a 11.492(5), b 18.942(3), c 23.083(9) Angstroem.Crystals of the palladium complex are triclinic, space group <*> with Z=1 in a unit cell of dimensions a 7.950(4), b 8.745(4), c 9.578(4) Angstroem, α 113.02(3), β 90.75(3), γ 116.65(3)^o.Both structures were solved by Patterson and Fourier methods and refined by blocked full-matrix least-squares to R=0.0528 for 2742 observed reflections in the first complex and by full-matrix least-squares to R=0.0252 for 1948 observed reflections in the second.In the octahedral ruthenium complex, DAP acts as a tridentate ligand adopting a mer configuration and the phosphine ligand is trans to the pyridinic nitrogen, while in the trans square-planar palladium complex DAP acts as a monodentate N-donor ligand.