Design and Synthesis of Nitrogen Containing Heterocyclic Ligands and the Formation of Coordination Complexes and Networks

Date of Graduation

Summer 2003


Master of Science in Chemistry


Chemistry and Biochemistry

Committee Chair

Eric Bosch


The desire to construct three-dimensional solids with predictable structure is driven by the correlation between structure and function. The use of non-covalent interactions to self-assemble small molecular components is one potential way to construct functional solids. Potential applications range from magnetic, electronic and non-linear optical materials to catalysts and synthetic zeolites. The self-assembly of organic ligands and metal cations is a powerful means to form one-, two- and three-dimensional coordination networks. We are specifically interested in the design and synthesis of nitrogen containing heterocyclic ligands with the intentions of forming one-dimensional ordered ligand:metal crystalline solids. In this study an array of 2,6- and 2,3-diarylpyrazine ligands have been synthesized and mixed with a variety of silver(I) salts producing discrete ligand:metal complexes as well as more complex polymeric networks. The ligand 1.2-bis(2'-pyrazineethynyl)pyrazine was designed to form ordered bimetallic networks by size selection between metal cations. A bimetallic network was achieved with small silver(I) cations and larger dicopper(II) tetraacetate moieties. Discrete 1:1 ligand:silver and 2:2 ligand:copper complexes were also produced. When an additional equivalent of silver(I) cations was mixed with the ligand a 1:2 ligand:silver polymer formed.

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