The photolysis of hydroxylamine in aqueous solution

D. Behar, D. Shapira, A. Treinin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The photolysis of NH2OH in aqueous solution at 2139 Å can be closely represented by the overall reaction 3NH2OH → NH3 + N2 + 3H2O, with some H2 also produced. Flash photolysis and pulse radiolysis of hydroxylamine solutions have proved that NHOH is an intermediate in the photolysis, and the properties of this radical were investigated. The effect of ethanol on the yields of NHOH and the final products strongly suggest that the major primary process is NH2OH hv → NH2 + OH. A minor parallel process leads to the production of H2. The photolysis of NH3OH+ was also investigated. At pH ∼2 the major nitrogen-containing products are NH3 and N2O. This change is related to transformation of the hydroxylamino radical to its acidic form (pK = 4.0 ± 0.1). Additional information is presented on the reactions of hydroxylamine with OH, H, and eaq-. The rate constants derived: k(eaq- + NH2OH) = 6.6 × 103 M-1 sec-1, k(eaq- + NH3OH+) = 1.0 × 1010 M-1 sec-1.

Original languageEnglish
Pages (from-to)180-186
Number of pages7
JournalJournal of Physical Chemistry
Volume76
Issue number2
DOIs
StatePublished - 1972

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