Crystal Structures And Properties Of Cu(Ag)X Adducts With Dmpzm

In the past decades, particular attention has been devoted to adducts of copper(I) and silver(I) halides with N-heterocyclic donor ligands because of their rich coordination chemistry, their relations to catalytic activities, electricity, biochemical systems, and photophysical properties. This thesis reported the isolation of five novel Cu(Ag)X adducts of bis(3,5-dimethylpyrazol-l-yl)methane (dmpzm). They are [CuI(dmpzm)]₂ (1), [CuCN(dmpzm)]_n (2), [CuSCN(dmpzm)]_n (3), [Cu(II)Cl(dmpzm)₂]Cl·3H₂O (4) and [Ag(dmpzm)₂]NO₃·H₂O (5), respectively. Adducts 1-5 were characterized by elemental analysis, IR spectrum, thermal analysis and luminescence spectrum. Moreover, their crystal structures were determined by X-ray crystallography. The molecular structure of 1 is a discrete rhomboid dimer with each Cu atom being tetrahedrally coordinated by two N atoms of one dmpzm ligand and two bridging iodide ions. The crystal structure of 2 or 3, consists of one dimensional zigzag chains of CuCN units or helical chains of CuSCN units. The structure of the cation of 4 consists of a [CuN+4Cl]⁺ chromophore, where five-coordinate Cu(II) shows a structure between trigonal bipyramidal and square pyramidal (Ï„=0.51). In the sructure of 5, the silver atom of the [Ag(dmpzm)₂]⁺ cation adopts a strongly distorted tetrahedral coordination geometry. The thermal properties of compounds 1-5 were studied and their decomposition was found to follow different decomposition modes. In addition, the luminescent properties of 1-3 were investigated.