Untersuchung der strahlenchmischen Oxydation von Ammoniak in 0,1 bis 16 molaren wäßrigen Lösungen

Schönherr, Siegfried; Röhl, Klaus F.; Schrader, Richard

doi:10.1002/zaac.19804650127

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…9 The authors suggested that this product is peroxynitrite, Od N-O-O -, which is rather stable at high pH. This is in agreement with earlier findings 11 that γ-irradiation of oxygencontaining aqueous ammonia solutions leads to production of peroxynitrite. The yield was 0.66 µmol J -1 for [NH 3 ] ) 6-15 mol L -1 11 but only 0.10, 0.22, and 0.39 at [NH 3 ] ) 1 × 10 -3 , 1 × 10 -2 , and 1.5 × 10 -1 mol L -1 , respectively.…”

Section: Introductionsupporting

confidence: 83%

“… Reaction 5 is rather complex, as it requires several bonds to be broken and formed simultaneously. Schönherr et al suggested two different stepwise mechanisms for the last reaction, either or An alternate explanation for the formation of peroxynitrite has been proposed involving the decomposition of NH 2 O 2 into NO and H 2 O, possibly through the intermediate formation of HONO - . Peroxynitrite is then produced by for which k 10 = 6.7 × 10 9 L mol -1 s -1 .…”

Section: Introductionmentioning

confidence: 99%

“…Reaction 5 is rather complex, as it requires several bonds to be broken and formed simultaneously. Scho ¨nherr et al 11 suggested two different stepwise mechanisms for the last reaction, either or An alternate explanation for the formation of peroxynitrite has…”

Section: Introductionmentioning

confidence: 99%

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Kinetics and Mechanism of the Reaction of ^•NH₂ with O₂ in Aqueous Solutions

et al. 1998

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The reaction of NH3 with •OH or SO4 •- radicals produces the aminyl radical, •NH2. Pulse radiolysis and laser flash photolysis techniques were utilized to study the formation of this radical, its absorption spectrum, its reaction with O2, and the mechanism of formation of subsequent intermediates and the main final product, peroxynitrite. The rates of formation of •NH2 and its absorption spectrum are in agreement with previous reports. The reaction of •NH2 with O2, however, was observed to take place much more rapidly than reported before and to involve an equilibrium of these reactants with the aminylperoxyl radical, NH2O2 •. The equilibrium is shifted toward completion of the reaction via catalyzed decomposition of this peroxyl radical, and this decomposition affects the observed rate of reaction of •NH2 with O2. The peroxyl radical deprotonates and isomerizes and finally forms NO. In the presence of O2 •-, NO is converted rapidly to peroxynitrite, ONO2 -. This product, which is stable at alkaline pH, was confirmed by γ-radiolysis of aerated ammonia solutions.

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Section: Introductionsupporting

confidence: 83%