Electrochemically reducing carbon dioxide into a fuel source using solar or wind energy can limit the increase of carbon dioxide entering the atmosphere. Manganese N-heterocyclic carbene (NHC) tricarbonyl halide complexes have been shown to electrocatalytically reduce carbon dioxide to carbon monoxide. This work proposes a synthetic method for a new catalyst, Mn(Mebim-pic)(CO)3Br, in lieu of Mn(Mebim-py)(CO)3Br. The aim of this project is to more effectively and efficiently reduce carbon dioxide to carbon monoxide by changing the ligands bound to the manganese center. By introducing a methylene spacer between the pyridine and benzimidazole rings in the Mebim-pic ligand, the change in the bite angle will theoretically increase the reactivity of the catalyst. Currently, the Mebim-py ligand has been produced in moderate yield to be bound to the Mn(CO)3Br fragment. Synthesis of the Mebim-pic ligand is expected shortly. Coordination of Mebim-pic to the manganese center is anticipated by early spring and will be analyzed by NMR and IR spectroscopy.

Manganese N-heterocyclic carbene pyridyl complexes for carbon dioxide reduction

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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