Date of Graduation
Master of Science in Chemistry
ligand, NMR titration, complexes, halogen bonding, x-ray structure
Ligand design is a vital component of coordination chemistry, and the use of ligands for complexation of metal cations have been explored for many years. Several metal complexes of silver and palladium have been reported in literature and these complexes have been fully studied. I chose to study silver and palladium, because these metals are precious and are used in several industries such as electronics and jewelry industry and also in catalysis. In addition to economic incentives to recover these metals, it should be noted that these heavy metals often pose both environmental and health hazards. For example, low levels of silver have been found to lead to the death of aquatic animals. Herein, I describe the synthesis of a novel ligand, 4-[(2-imidazylethynyl)]-5-(2- pyridylethynyl) veratrole and its silver(I) and palladium(II) complexes. The ligand was characterized by 1H, 13C NMR, and by elemental analysis. The single X-ray structure of the ligand and the palladium complex were also determined. 1H NMR titration revealed a 1:1 complex formation between the ligand and silver, and the ligand and palladium cations. Long range plans involve the attachment of this ligands to a polymer support for the extraction of these cations from waste. Furthermore, I also described the X-ray structure of three iodoimidazole derivatives; 1-benzyl-2-iodo-1H-imidazole, 1-benzyl-4- iodo-1H-imidazole and 1-benzyl-2-iodo-1H-benzimidazole and the halogen bonds that dominate the intermolecular interactions in each of these three structures.
© Chideraa Iheanyi Nwachukwu
Nwachukwu, Chideraa Iheanyi, "Synthesis and Characterization of a Novel Ligand and Its Silver(I) and Palladium(II) Complexes: An Incidental Discovery of Halogen Bonding in Three Structures of Iodoimidazoles" (2017). MSU Graduate Theses. 3112.