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

Journal Article · · Nature Chemistry
 [1];  [2];  [3];  [4];  [2];  [5];  [6];  [2];  [2];  [3]
  1. Georgetown University, Washington, DC (United States); SLAC
  2. Cornell University, Ithaca, NY (United States)
  3. Georgetown University, Washington, DC (United States); Michigan State University, East Lansing, MI (United States)
  4. Georgetown University, Washington, DC (United States)
  5. Stanford University, CA (United States)
  6. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
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. In this report 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.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
National Institutes of Health (NIH); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1988064
Journal Information:
Nature Chemistry, Journal Name: Nature Chemistry Journal Issue: 11 Vol. 14; ISSN 1755-4330
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

References (22)

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Dioxygen Reactivity with a Ferrocene-Lewis Acid Pairing: Reduction to a Boron Peroxide in the Presence of Tris(pentafluorophenyl)borane journal September 2014
Lewis Acid Coordination Redirects S‐Nitrosothiol Signaling Output journal April 2020
Ecological and toxicological effects of inorganic nitrogen pollution in aquatic ecosystems: A global assessment journal August 2006
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Hyponitrite Radical, a Stable Adduct of Nitric Oxide and Nitroxyl journal December 2003
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NO 2 Activation and Reduction to NO by a Nonheme Fe(NO 2 ) 2 Complex journal July 2014
Complexation of Nitrous Oxide by Frustrated Lewis Pairs journal July 2009
Proton-Coupled Electron Transfer: The Engine of Energy Conversion and Storage journal January 2022
Long-Term γ-Radiolysis Kinetics of NO3 and NO2 Solutions journal April 2011
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Small Molecule Signaling Agents: The Integrated Chemistry and Biochemistry of Nitrogen Oxides, Oxides of Carbon, Dioxygen, Hydrogen Sulfide, and Their Derived Species journal February 2012
Nitrite reduction to nitric oxide by deoxyhemoglobin vasodilates the human circulation journal November 2003
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Redox-coupled proton transfer mechanism in nitrite reductase revealed by femtosecond crystallography journal February 2016
Characterization of the Magnitude and Kinetics of Xanthine Oxidase-catalyzed Nitrite Reduction journal January 2001
Nitrite Reductase Activity of Cytochrome c journal November 2008
A bioinspired iron catalyst for nitrate and perchlorate reduction journal November 2016


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