Synthesis and Characterization of New Binuclear Nickel Complexes
Meeuwenberg, Leah M.
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The reduction of CO2 has been accomplished using many methods in the laboratory. Some of these include the use of bipyridine complexes and semiconducter materials, as well as electrochemical and photochemical means. One NiO "cradle" complex that reduces CO2 in the presence of NaPF6, Ni2(µ2-CNMe)(CNMe)2(dppm)2, was first synthesized by DeLaet. A new class of compounds based on Ni2(µ2-CNMe)(CNMe)2(dppm)2 were made using various substituent groups to replace the methyl on the isocyanide. The synthesis was adapted from a synthesis reported by Gong for the methyl version of this compound. These compounds have nice electrochemistry and IR spectroelectrochemistry. Since the synthesis and electrochemistry of these compounds were so successful, the 1+ oxidation state was isolated for R=t-C4H9. Another compound that reduces CO2is [Ni3(µ3-CNMe)(µ3-I)(dppm)3][I] first synthesized by Ratliff. Since this compound has been made with various isocyanide groups, the next step was to synthesize this compound with a bromide ligand instead of an iodide ligand. This synthesis was successful.