Über die Bildung von Hyponitrit durch Disproportionierung des Hydroxylamins

Nast, R.; Föppl, I.

doi:10.1002/zaac.19502630511

Cited by 25 publications

(12 citation statements)

References 4 publications

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“…2 ], prior to a catalytic disproportionation reaction yielding [Fe II (TPP)(NO)] and excess NH 3 , described as an intramolecular electron transfer or through the reaction of HA with the initially formed bis-coordinated complex [28]. The reaction of HA with Fe III TPP indeed provides a synthetic method for [Fe II (TPP)-(NO)] [17].…”

Section: Discussionmentioning

confidence: 97%

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Disproportionation of hydroxylamine by water-soluble iron(III) porphyrinate compounds

Bari

Amorebieta

Gutiérrez

et al. 2010

Journal of Inorganic Biochemistry

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Section: Discussionmentioning

confidence: 97%

“…The same products are obtained by spontaneous HA disproportionation, a reaction that exhibits a strong dependence with pH, described by Eqs. (2) and (3) [8,28].…”

Section: Discussionmentioning

confidence: 99%

Disproportionation of hydroxylamine by water-soluble iron(III) porphyrinate compounds

Bari

Amorebieta

Gutiérrez

et al. 2010

Journal of Inorganic Biochemistry

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“…As a case in point, hydroxylamine oxidoreductase selectively produces nitric oxide (NO) from hydroxylamine (NH 2 OH) using an Fe active site despite the proclivity of metal-driven NH 2 OH reactions to form ill-defined product mixtures (vide infra). [8][9][10] Moreover, given that the nitrification of excess fixed nitrogen introduced by humanity to terrestrial ecosystems imposes tremendous environmental burden through eutrophication and the atmospheric release of gaseous NO x species (a topic discussed in detail elsewhere), 11 the elucidation of the molecular details of nitrification promises greater control of ecological nitrogen management with refined models of nitrogen flux or the development of cost-effective and environmentally benign nitrification inhibitors.…”

Section: Context and Scalementioning

confidence: 99%

Alternative Bioenergy: Updates to and Challenges in Nitrification Metalloenzymology

Lancaster

Caranto

Majer

et al. 2018

Joule

111

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Biological ammonia (NH 3) oxidation to nitrate (NO 3-)-nitrification-is a critical pathway of the biogeochemical nitrogen cycle. Additional products and by-products of this pathway include nitrite (NO 2-), nitric oxide (NO), nitrous oxide (N 2 O), and nitrogen dioxide (NO 2), several of which are pollutants. How these species are generated during nitrification is not entirely clear, but pathways toward their generation have drawn substantial research effort. The cumulative evidence shows several parallel biological pathways comprising the net nitrification process. Bacteria were long thought to mediate all nitrification transformations; however, archaeal nitrifiers are now recognized. Furthermore, nitrification was thought to require two distinct microbial classes: NH 3 oxidizers to oxidize NH 3 to NO 2-, and NO 2 oxidizers that oxidize NO 2 to NO 3-. Comammox bacteria, which effect complete oxidation of NH 3 to NO 3-, were recently discovered. This Perspective summarizes the current understanding of nitrification biochemistry and highlights exciting opportunities for future research.

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“…Numerous studies have been conducted involving calorimetric and explosion hazard assessments of aqueous HA solutions, − and some reasonable reaction mechanisms have been developed. − HA in the free base form has been shown to decompose at high temperatures according to reactions and , below, which respectively account for five and two-sevenths of the total decomposition. , …”

Section: Introductionmentioning

confidence: 99%

Initial Decomposition Pathways of Aqueous Hydroxylamine Solutions

2017

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This work examined the reaction pathways involved in the initial decomposition of aqueous hydroxylamine solutions via the overall reaction, 2NHOH → NH + HNO + HO, using quantum chemistry calculations incorporating solvent effects. Several possible decomposition mechanisms were identified and investigated: three neutral-neutral bimolecular, two water-catalyzed, one neutral trimolecular, two ion-neutral bimolecular, and one cation-catalyzed. Optimized structures for the reactants, products, and transition states were obtained at the ωB97XD/6-311++G(d,p)/SCRF = (solvent = water) level of theory, and the total electron energies of such structures were calculated at the CBS-QB3 level of theory. The cation-catalyzed reaction 2NHOH + NHOH → NH + HNO + HO + NHOH (maximum energy barrier (ΔE) = 53.6 kJ/mol) and the anion-neutral bimolecular reaction NHOH + NHO → NH + NO + HO (ΔE = 79.0 kJ/mol) were both found to be plausible candidates for the dominant step in the initial decomposition. The results of this study indicate that both acidic and basic conditions can affect the thermal stability of hydroxylamine in water.

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Über die Bildung von Hyponitrit durch Disproportionierung des Hydroxylamins

Cited by 25 publications

References 4 publications

Disproportionation of hydroxylamine by water-soluble iron(III) porphyrinate compounds

Disproportionation of hydroxylamine by water-soluble iron(III) porphyrinate compounds

Alternative Bioenergy: Updates to and Challenges in Nitrification Metalloenzymology

Initial Decomposition Pathways of Aqueous Hydroxylamine Solutions

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