Nickel(II) isopropylxanthate complexes containing phosphorus donor ligands in the coordination sphere-II

Article abstract of DOI:10.1016/S0277-5387(97)00005-3

Nickel(II) isopropylxanthate complexes, [Ni(Prⁱxa)₂(PPh₃)], [NiX(Prⁱxa)(TCEP)], [Ni(P-rⁱxa)₂(TRIPHOS)] · H₂O and [Ni(Prⁱxa)(TRIPHOS)][Ni(Prⁱxa)₃] {Prⁱ = i-C₃H₇, xa = S₂CO^-, X = Cl^- or Br^-, PPh₃ = triphenylphosphine, TCEP = tris(2-cyanoethyl)phosphine and TRIPHOS = 1,1,1-tris-(diphenylphosphino-methyl)ethane}, have been synthesized. The compounds have been characterized by elemental analysis, magnetochemical and conductivity measurements and IR and electron spectroscopies. The structure of [Ni(Prⁱxa)₂(PPh₃)] has been determined by single-crystal X-ray diffraction. The nickel atom is four-coordinated by three sulfur atoms from two non-equivalently bonded isopropylxanthato anions and by one phosphorus atom from PPh₃ [Ni - S = 2.2282(13), 2.2588(14), and 2.2382(13), respectively, and Ni - P = 2.2023(13) A], in a distorted square-planar geometry. One of the two xanthate ligands is coordinated as a monodentate ligand. The distance between nickel and non-coordinated sulfur atom is 2.816(2) A.