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Lewis acid-assisted reduction of nitrite to nitric and nitrous oxides via the elusive nitrite radical dianion

Nature Chemistry volume 14, pages 1265–1269 (2022)Cite this article

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Abstract

Reduction of nitrite anions (NO2−) to nitric oxide (NO), nitrous oxide (N2O) and ultimately dinitrogen (N2) takes place in a variety of environments, including in the soil as part of the biogeochemical nitrogen cycle and in acidified nuclear waste. Nitrite reduction typically takes place within the coordination sphere of a redox-active transition metal. Here we show that Lewis acid coordination can substantially modify the reduction potential of this polyoxoanion to allow for its reduction under non-aqueous conditions (−0.74 V versus NHE). Detailed characterization confirms the formation of the borane-capped radical nitrite dianion (NO22−), which features a N(II) oxidation state. Protonation of the nitrite dianion results in the facile loss of nitric oxide (NO), whereas its reaction with NO results in disproportionation to nitrous oxide (N2O) and nitrite (NO2−). This system connects three redox levels in the global nitrogen cycle and provides fundamental insights into the conversion of NO2− to NO.

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Fig. 1: The role of protons and Lewis acids in nitrite reduction.
Fig. 2: Synthesis and structures of Lewis acid-capped nitrite mono- and dianions.
Fig. 3: Probing the electronic structure of the nitrite dianion by EPR and X-ray absorption spectroscopy, as well as DFT calculations.
Fig. 4: Reactivity of the nitrite dianion.

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Data availability

Crystallographic data for the structures reported in this Article have been deposited at the Cambridge Crystallographic Data Centre, under deposition numbers CCDC 2074366 (1), 2074367 (2), 207468 (3), 2074369 (4), 2074370 (5), 2074371 (6) and 2074372 (7). Copies of the data can be obtained free of charge via https://www.ccdc.cam.ac.uk/structures/. All other data supporting the findings of this study are available within the Article and its Supplementary Information.

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Acknowledgements

This work was supported by the NIH (P41GM103521 to J.H.F., R35GM124908 to K.M.L. and R01GM126205 to T.H.W.). XAS data were obtained at SSRL, which is supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under contract no. DE-AC02-76SF00515. The SSRL Structural Molecular Biology Program is supported by the Department of Energy’s Office of Biological and Environmental Research and by NIH/NIGMS (including P41GM103393). The work at SSRL was also supported by the US Department of Energy Office of Basic Energy Sciences (proposal no. 100487).

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Authors and Affiliations

  1. Department of Chemistry, Georgetown University, Washington, DC, USA

    Valiallah Hosseininasab, Pokhraj Ghosh, Jeffery A. Bertke & Timothy H. Warren

  2. Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, USA

    Ida M. DiMucci, Siddarth Chandrasekharan, Jack H. Freed & Kyle M. Lancaster

  3. Department of Chemistry, Michigan State University, East Lansing, MI, USA

    Pokhraj Ghosh & Timothy H. Warren

  4. Department of Physics, Stanford University, Stanford, CA, USA

    Charles J. Titus

  5. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA, USA

    Dennis Nordlund

Authors
  1. Valiallah Hosseininasab
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Contributions

V.H. and T.H.W. conceived the synthetic approach. V.H. carried out synthetic experiments. V.H. and P.G. performed electrochemical measurements. V.H. and J.A.B. performed crystallographic analysis. I.M.D., C.J.T. and D.N. collected XAS data. K.M.L. and S.C. collected EPR data. I.M.D. and K.M.L. carried out electronic structure calculations and interpreted spectroscopic data. V.H., K.M.L. and T.H.W. wrote the manuscript, with assistance by J.H.F.

Corresponding authors

Correspondence to Kyle M. Lancaster or Timothy H. Warren.

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The authors declare no competing interests.

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Peer review information

Nature Chemistry and the authors thank Rebecca Melen and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.

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Supplementary information

Supplementary Information

Synthesis, characterization and computational details, Figs. 1–42, schemes 1–5 and computational coordinates.

Supplementary Data 1

Crystallographic data for compound 1; CCDC 2074366.

Supplementary Data 2

Crystallographic data for compound 2; CCDC 2074367.

Supplementary Data 3

Crystallographic data for compound 3; CCDC 2074368.

Supplementary Data 4

Crystallographic data for compound 4; CCDC 2074369.

Supplementary Data 5

Crystallographic data for compound 5; CCDC 2074370.

Supplementary Data 6

Crystallographic data for compound 6; CCDC 2074371.

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Hosseininasab, V., DiMucci, I.M., Ghosh, P. et al. Lewis acid-assisted reduction of nitrite to nitric and nitrous oxides via the elusive nitrite radical dianion. Nat. Chem. 14, 1265–1269 (2022). https://doi.org/10.1038/s41557-022-01025-9

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