• Platinum;
  • Palladium;
  • Copper;
  • P-N ligand;
  • Crystal structure


The reactions of pyrimidine-phosphine ligand N-[(diphenylphosphino)methyl]-2-pyrimidinamine (L) with various metal salts of PtII, PdII and CuI provide three new halide metal complexes, Pt2Cl4(μ-L)2·2CH2Cl2 (1), Pd2Cl4(μ-L)2 (2), and [Cu2(μ-I)2L2]n (3). Single crystal X-ray diffraction studies show that complexes 1 and 2 display a similar bimetallic twelve-membered ring structure, while complex 3 consists of one-dimensional polymeric chains, which are further connected into a 2-D supramolecular framework through hydrogen bonds. In the binuclear complexes 1 and 2, the ligand L serves as a bridge with the N and P as coordination atoms, but in the polymeric complex 3, both bridging and chelating modes are adopted by the ligand. The spectroscopic properties of complexes 1-3 as well as L have been investigated, in which complex 3 exhibits intense photoluminescence originating from intraligand charge transfer (ILCT) π[RIGHTWARDS ARROW]π* and metal-to-ligand charge-transfer (MLCT) excited states both in acetonitrile solution and solid state, respectively.