Structural and Electronic Studies of Binuclear and Tetranuclear Coordination Complexes Containing Nickel and Cobalt
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A number of compounds containing binuclear cationic coordination complexes and containing tetrafluoroborate anions were synthesized. These compounds were characterized using infrared spectroscopy and electronic absorption spectroscopy in the UV-Visible range, showing the syntheses to have been successful and reproducible. In all cases, the two metal atoms were binucleated by the planar Robson macrocycle, and in all cases, tetrafluoroborate served as the anion, however, the number of tetrafluoroborate anions depended on the charge of the corresponding cationic coordination complex. Variation among compounds came from the identity of the two metal atoms, being nickel for three of the compounds and cobalt for one, and also the identity of the axial ligands, being either pyridine, 7-azaindolate, or diphenyl acetate. Vapor diffusion recrystallization was performed on a number of compounds with the intention of growing crystals of sufficient quality for X-ray Crystallography, however, these efforts were unsuccessful. In addition, crystallographic data from years of previous work by several students on this project were compiled and analyzed in order to elucidate trends and coalesce work on the project.