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Reduction of nitric oxide by hydroxylamine. 1. Kinetics and mechanism

Journal Article · · Inorg. Chem.; (United States)
DOI:https://doi.org/10.1021/ic00231a029· OSTI ID:5456712

The reaction of nitric oxide with hydroxylamine conforms to the rate law -dP/sub NO//dt = k/sub 2/(NH/sub 2/O/sup -/)P/sub NO/ in the pH range 7.29-13.14, confirming the rate-determining abstraction of an N-bound H atom by NO. Measured kinetic quantities: k/sub 2/ = 6.68 x 10/sup -3/ M/sup -1/ s/sup -1/ at 25/sup 0/C; ..delta.. H double dagger = 29.6 kJ mol/sup -1/; ..delta.. S double dagger = -189 J K/sup -1/ mol/sup -1/. Thermodynamic values have been obtained for the pK/sub a/ of NH/sub 2/OH at several temperatures; ..delta.. H of dissociation = 55.29 kJ mol/sup -1/. The presence of trace amounts of O/sub 2/ in the NO-NH/sub 2/OH reaction system catalyzes the reaction and leads to a reduced molar product ratio n/sub N/sub 2/O/, effects that are ascribed at least in part to reactive N/sub 2/O/sub 3/. The difference in reactivity between the NO/sup -/ intermediate formed in this reaction and that produced in trioxodinitrate decomposition is discussed.

Research Organization:
State Univ. of New York, Stony Brook
OSTI ID:
5456712
Journal Information:
Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 25:11; ISSN INOCA
Country of Publication:
United States
Language:
English