Abstract
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., ^sup 1^H- and ^sup 13^C-n.m.r. and mass spectra. The ^sup 1^H- and ^sup 13^C- n.m.r. chemical shifts reveal coordination of one pyrimidine-N and sulphur atoms to Pt^sup II^ and Pd^sup II^. The i.r. spectra indicate that the ligand behaves as a neutral monodentate towards Ni^sup II^; coordinates via a pyrimidine-N and as a bidendate towards Pd^sup II^ and Pt^sup II^ coordinates via thione-S and a pyrimidine-N. The magnetic moments and electronic spectral data suggest a square-planar geometry for Pt^sup II^ and Pd^sup II^ complexes, a mixture of square-planar and tetrahedral geometries for the tetracoordinate Ni^sup II^ complex and octahedral for the six-coordinate one. The E.I. mass spectra of the complexes showed some isotope ion peaks of [M]^sup +^ and fragments containing metals; assignments of fragments containing metal ions were supported by the appearance of their peaks among isotope clusters.[PUBLICATION ABSTRACT]