Synthesis, Reactivity and Crystal Structures of the Palladium(II) Complexes with the Pyrimidine Containing Ligand: Crystal Structures of [Pd(PPh3)(η1-C4H3N2)(η2-S2CNC4H8)] and [Pd(PPh3)(η1-C4H3N2)(η2-Tp)]

Treatment of Pd(PPh3)4 with 5-bromo-pyrimidine [C4H3N2Br] in dichloromethane at ambient temperature cause the oxidative addition reaction to produce the palladium complex [Pd(PPh3)2(η1-C4H3N2)(Br)], 1, by substituting two triphenylphosphine ligands. In acetonitrile solution of 1 in refluxing temperature for 1 day, it do not undergo displacement of the triphenylphosphine ligand to form the dipalladium complex [Pd(PPh3)Br]2{μ,η2-(η1-C4H3N2)}2, or bromide ligand to form chelating pyrimidine complex [Pd(PPh3)2(η2-C4H3N2)]Br. Complex 1 reacted with bidentate ligand, NH4S2CNC4H8, and tridentate ligand, KTp {Tp = tris(pyrazoyl-1-yl)borate}, to obtain the η2-dithiocarbamate η1-pyrimidine complex [Pd(PPh3)(η1-C4H3N2)(η2-S2CNC4H8)], 4 and η2-Tp η1-pyrimidine complex [Pd(PPh3)(η1-C4H3N2)(η2-Tp)], 5, respectively. Complexes 4 and 5 are characterized by X-ray diffraction analyses.