Organometallic catalysts are promising candidates for reduction of carbon dioxide (CO2) to carbon monoxide (CO), a useful industrial chemical. Tricarbonyl metal diimine complexes have been studied for this purpose and demonstrate the desired reactivity in many cases. 2,2′-bipyridine-based catalysts have been extensively investigated, yet many details of their mechanism(s) of action are poorly understood. The current understanding of these complexes suggests a mechanism which requires CO2 to simultaneously interact with both the metal center and the diimine ligand. Here, a project focusing on installation of steric bulk on a bipyridine analogue, 4,5-diazafluorene, was envisioned as a strategy for probing the proposed mechanism. 4,5-diazafluorene (daf) offers the interesting opportunity to install steric bulk perpendicular to the plane of the aromatic ring system via derivatization of the daf framework at the “9” position. The synthesis of daf-based compounds will be discussed, including details of unexpected reactivity encountered during preparation of the new derivatives of daf.

Unexpected reactivity during synthesis of 4,5-diazafluorene ligands to support new catalysts for co2 reduction

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

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.