14696-98-1Relevant articles and documents
Heterogeneous reaction of gaseous ozone with aqueous iodide in the presence of aqueous organic species
Hayase, Sayaka,Yabushita, Akihiro,Kawasaki, Masahiro,Enami, Shinichi,Hoffmann, Michael R.,Colussi, Agustin J.
, p. 6016 - 6021 (2010)
The fast reaction of gaseous ozone, O3(g), with aqueous iodide, I-(aq), was found to be affected by environmentally relevant cosolutes in experiments using cavity ring-down spectroscopy (CRDS) and electrospray ionization mass spectrometry (ESIMS) for the detection of gaseous and interfacial products, respectively. Iodine, I2(g), and iodine monoxide radical, IO(g), product yields were suppressed in the presence of a few millimolar phenol (pKa = 10.0), p-methoxyphenol (10.2), or p-cresol (10.3) at pH 3 but unaffected by salicylic acid (pKa2 = 13.6), tert-butanol, n-butanol, or malonic acid. We infer that reactive anionic phenolates inhibit I2(g) and IO(g) emissions by competing with I -(aq) for O3(g) at the air/water interface. ESIMS product analysis supports this mechanism. Atmospheric implications are discussed.
Direct emission of I2 molecule and IO radical from the heterogeneous reactions of gaseous ozone with aqueous potassium iodide solution
Sakamoto, Yosuke,Yabushita, Akihiro,Kawasaki, Masahiro,Enami, Shinichi
, p. 7707 - 7713 (2009)
Recent studies indicated that gaseous halogens mediate key tropospheric chemical processes. The inclusion of halogen-ozone chemistry in atmospheric box models actually closes the ～50% gap between estimated and measured ozone losses in the marine boundary
Formation of iodine monoxide radical from the reaction of CH2I with O2
Enami, Shinichi,Ueda, Junya,Goto, Masashi,Nakano, Yukio,Aloisio, Simone,Hashimoto, Satoshi,Kawasaki, Masahiro
, p. 6347 - 6350 (2004)
The rate constants of IO radical formation from the reaction of CH 2I with O2 were determined in the pressure range of 5-80 Torr with N2 diluent at 278-313 K, using cavity ring-down spectroscopy. The room temperature rate
An experimental and theoretical study of the reactions OIO + NO and OIO + OH
Plane,Joseph,Allan,Ashworth,Francisco
, p. 93 - 100 (2008/10/09)
The kinetics of the reaction OIO + NO were studied by pulsed laser photolysis/time-resolved 'cavity ring-down spectroscopy, yielding k(235-320 K) = 7.6+4.0-3.1 × 10-13 exp[(607±128)/T] cm 3 molecule-1 s-1. Quantum calculations on the OIO + NO potential-energy surface show that the reactants form a weakly bound OIONO intermediate, which then dissociates to the products IO + NO2. Rice-Ramsberger-Kassel-Markus (RRKM) calculations on this surface are in good accord with the experimental result. The most stable potential product, IONO2, cannot form because of the significant rearrangement of OIONO that would be required. The reaction OIO + OH was then investigated by quantum calculations of the relevant stationary points on its potential-energy surface. The very stable HOIO2 molecule can form by direct recombination, but the bimolecular reaction channels to HO2 + IO and HOI + O 2 are closed because of significant energy barriers. RRKM calculations of the HOIO2 recombination rate coefficient yield k rec.0 = 1.5 × 10-27 (T/300 K)-3.93 cm6 molecule-2 s-1, krec.∞ = 5.5 × 10-10 exp(46/T) cm3 molecule-1 s-1, and Fc = 0.30. The rate coefficients of both reactions are fast enough around 290 K and 1 atm pressure for these reactions to play a potentially important role in the gas phase and aerosol chemistry in the marine boundary layer of the atmosphere.
Inorganic Gas-Phase Reactions of the Nitrate Radical: I2 + NO3 and I + NO3
Chambers, R. M.,Heard, A. C.,Wayne, R. P.
, p. 3321 - 3331 (2007/10/02)
A low-pressure discharge-flow technique, with various optical detection methods, has been used to determine, for the first time, bimolecular rate coefficients for the reactions between I2 and NO3, k1 = (1.5 +/- 0.5) * 1E-12 cm3 molecule-1 s-1, and I and NO3, k2 = (4.5 +/- 1.9) * 1E-10 cm3 molecule-1 s-1.No temperature dependence over the range 292-423 K, or pressure dependence from 1.2 to 4.7 Torr, was observed for the reaction I2 + NO3.A heterogeneous generation of I atoms was observed in the I + NO3 reaction system which was interpreted as evidence for the reaction of IO at the surface of the flow reactor to form a higher oxide of iodine and iodine atoms.The rate coefficient for reaction of IO at the walls to form I was found to be 25-45 s-1.An upper limit for the heat of formation of IONO2 of 21 +/- 3 kJ mol-1 was also derived.
