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Platinum(II), palladium(II) and nickel(II) complexes with N-allyl-N¢-pyrimidin-2-ylthiourea were synthesized in 1:1 and 1:2 [metal:ligand] stoichiometric ratios and characterized by elemental analyses, molar conductivities, magnetic susceptibilities and by i.r., u.v.-vis., 1 H-and 13 C-n.m.r. and mass spectra. The 1 H-and 13 C-n.m.r. chemical shifts reveal coordination of one pyrimidine-N and sulphur atoms to Pt II and Pd II . The i.r. spectra indicate that the ligand behaves as a neutral monodentate towards Ni II ; coordinates via a pyrimidine-N and as a bidendate towards Pd II and Pt II coordinates via thione-S and a pyrimidine-N. The magnetic moments and electronic spectral data suggest a square-planar geometry for Pt II and Pd II complexes, a mixture of square-planar and tetrahedral geometries for the tetracoordinate Ni II complex and octahedral for the six-coordinate one. The E.I. mass spectra of the complexes showed some isotope ion peaks of [M] + and fragments containing metals; assignments of fragments containing metal ions were supported by the appearance of their peaks among isotope clusters.

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Four of the coordination compounds of the general formula, [M(DPPP)(APY)(H2O) Cl2].xH2O, where M = Ni(II), Cu(II), Mn(II), and Fe(II) and x = 0, 1, or 2 molecules of H2O, DPPP = 1,3-bis(diphenylphosphino)propane, and APY = 2-aminopyridine, have been prepared and characterized. The structure of the complexes has been confirmed by elemental analysis, FT-IR, and UV-Vis spectral data. Thermal analysis (thermogravimetry, derivative thermogravimetry, and differential thermal studies) has been used to study the thermal decomposition stages. Biological activity of all synthesized complexes was tested against five bacterial strains and three fungal strains. Bacteria and fungi strains are common contaminants of the environment in Saudi Arabia, some of which are frequently reported from contaminated water, soil, and food.