The growing concern of the environmental implications of fossil fuels has driven researchers to explore “carbon-free” fuels to supplement the global energy demands. Dinitrogen (N2) is an inexpensive feedstock for producing valuable chemical fuels, such as hydrazine and ammonia (NH3). Ammonia can serve as an energy vector to generate H2 through NH3 decomposition, or for direct use in ammonia fuel cells. We are developing molecular catalysts for N2 reduction and NH3 oxidation and aim to understand N-H bond energies of M-NxHy intermediates formed during catalysis. Our current research is focused on the use of anionic pincer ligated Group 6 metal complexes, primarily with chromium for N2 and NH3 coordination, activation, and the formation and/or cleavage of N-H bonds. This work will describe the development and interconversion of Cr aryl- or alkylamido and imido complexes and our efforts to prepare Cr complexes to catalyze NH3 oxidation and N2 reduction.

Development of Cr complexes bearing anionic pincer ligands for N2 reduction and NH3 oxidation

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