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Published February 19, 2021 | Supplemental Material + Accepted Version + Submitted
Journal Article Open

Hydrazine Formation via Coupling of a Nickel(III)–NH₂ Radical

Abstract

M(NHₓ) intermediates involved in N−N bond formation are central to ammonia oxidation (AO) catalysis, an enabling technology to ultimately exploit ammonia (NH₃) as an alternative fuel source. While homocoupling of a terminal amide species (M‐NH₂) to form hydrazine (N₂H₄) has been proposed, well‐defined examples are without precedent. Herein, we discuss the generation and electronic structure of a NiIII‐NH₂ species that undergoes bimolecular coupling to generate a Ni^(II)₂(N₂H₄) complex. This hydrazine adduct can be further oxidized to a structurally unusual Ni₂(N₂H₂) species; this releases N₂ in the presence of NH₃, thus establishing a synthetic cycle for Ni‐mediated AO. Distribution of the redox load for H₂N‐NH₂ formation via NH₂ coupling between two metal centers presents an attractive strategy for AO catalysis using Earth‐abundant, late first‐row metals.

Additional Information

© 2020 Wiley‐VCH GmbH. Issue Online: 12 February 2021; Version of Record online: 23 December 2020; Accepted manuscript online: 05 November 2020; Manuscript received: 04 October 2020. The authors acknowledge Dr. Michael Takase and Lawrence Henling for assistance with X‐ray crystallography. This work was supported by the National Institutes of Health (General Medical Sciences, grant GM070757) and an NSF‐GRFP to N.X.G. The Caltech EPR facility is supported by the Dow Next Generation Educator Fund. The X‐Ray Crystallography Facility in the Beckman Institute at Caltech has been supported by a Dow Next Generation Instrumentation Grant. The authors declare no conflict of interest.

Attached Files

Accepted Version - nihms-1646007.pdf

Submitted - NiNH2-ChemRxiv.pdf

Supplemental Material - anie202013119-sup-0001-misc_information.cif

Supplemental Material - anie202013119-sup-0001-misc_information.pdf

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Additional details

Created:
August 22, 2023
Modified:
October 23, 2023