7789-33-5Relevant articles and documents
Slow chain reactions of Br2 and Cl2 with HI: Multiple state analysis and vibrational relaxation of HBr(v = 2) and HCl(v = 1 - 4)
Dolson, David A.,Leone, Stephen R.
, p. 4009 - 4021 (1982)
Two chain reactions of the general form are studied by realtime detection of infrared chemiluminescence from the vibrationally excited HX(v) products.Both are characterized by k2 a flow cell apparatus at 295 K.Observations are made on Δv = -1 fluorescence from individual vibrational levels, and the results are treated with a complete mathematical analysis for the production of multiple vibrational states and their subsequent individual decays.Effects of vibrational cascading on the measurements of k2 are discussed.The chain propagation rate coefficients determined by this technique for k1(X = Br, Cl) and k2(X = Br, Cl) are 8.9(+/- 1.3) * 10-12, 1.4(+/- 0.3) * 10-10, 3.4(+/- 0.8) * 10-13, and 8.5(+/- 1.1) * 10-17 cm3 molecule-1 s-1, respectively.The deactivation rate coefficients for HBr(v = 2) and HCl(v = 1,2,3,4) by HI are 1.7(+/- 0.2) * 10-12, 1.43 (+/- 0.05) * 10-13, 6.3(+/- 0.5) * 10-13, 7.0(+/- 2.4) * 10-13, and 3.2(+/- 0.7 * 10-12 cm3 molecule-1 s-1, respectively.Vibrational deactivation rate cofficients for HCl(v = 1,2,3,4) by Cl2 are 5.2(+/- 0.3) * 10-15, 2.2(+/- 0.3) * 10-14, 4.3(+/- 4.2) * 10-14, and 2.8(+/- 1.5) * 10-13 cm3 molecule-1 s-1, respectively.The vibrational deactivation efficients of HCl(v = 1 - 4) by HI and Cl2 scale approximately as vn, where n = 2.1(+/- 0.2) and 2.8(+/- 0.2), respectively.
Heterogeneous reaction of HOI with sodium halide salts
Moessinger, Juliane C.,Cox, R. Anthony
, p. 5165 - 5177 (2007/10/03)
The interaction of gaseous HOI with crystalline grains of NaCl and sea-salt and thin films of NaBr crystals has been studied in a wall coated tubular flow reactor coupled to a quadrupole mass spectrometer over a concentration range (0.2-8) × 1012 molecules cm-3 at 278 and 298 K. On a fresh surface, the uptake coefficients determined were independent of temperature with γ = 0.034 ± 0.009, γ = 0.016 ± 0.004, and γ = 0.061 ± 0.021 for NaBr, NaCl, and sea-salt, respectively. No increase in reactivity was observed on addition of water vapor between 0 and 23% relative humidity at 278 K. It was also shown that the reactivity of the salt surface decreased with time of exposure to HOI and that steady-state uptake was slower on aged salt surfaces. Products of the reactions released into the gas phase were IBr, ICl, and IBr + ICl for the reaction of HOI on NaBr, NaCl, and sea-salt surfaces, respectively. The atmospheric implications of the results obtained are briefly discussed.
Characterisation of the tetrahalophosphonium cations PBrnI4 - n+ (0 ≤ n ≤ 4) by 31P MAS NMR, IR and Raman spectroscopy and the crystal structures of PI4+AlCl4-, PI4+AlBr4- and PI4+GaI4-
Aubauer,Kaupp,Klapoetke,Noeth,Piotrowski,Schnick,Senker,Suter
, p. 1880 - 1889 (2007/10/03)
The novel tetrahalophosphonium salts PBr4+AsF6-, PI4+AlCl4- and PI4+EBr4- (E = Al, Ga) have been synthesised. A variety of solid complexes containing PBr4+ (e.g. PBr4+AsF6-, PBr4+AlBr4- PBr4+GaBr4-), PI4+ (e.g. PI4+AlCl4-, PI4+AlBr4-, PI4+GaBr4-) or the mixed species PBrnI4 - n+ (0 ≤ n ≤ 4, containing AlBr4-, GaBr4-, AsF6- or SbF6-) have been studied by solid-state 31P MAS NMR and vibrational spectroscopy. The influence of the counter-ion on the chemical shift and the vibrational frequencies are discussed. The crystal structures of PI4+AlCl4-, PI4+AlBr4- and PI4+GaI4- are reported. Evidence for the existence of the hitherto unknown mixed bromoiodophosphonium cations PBr3I+, PBr2I2+ and PBrI3+ has been confirmed by spin-orbit corrected density functional calculations of isotropic 31P chemical shifts for PBrnI4 - n+.
Kinetics of the IO radical. 2. Reaction of IO with BrO
Gilles, Mary K.,Turnipseed, Andrew A.,Burkholder, James B.,Ravishankara,Solomon, Susan
, p. 5526 - 5534 (2007/10/03)
The rate coefficient for the IO + BrO → products (1) reaction was measured using pulsed laser photolysis with a discharge flow tube for radical production and pulsed laser-induced fluorescence and UV absorption for detection of IO and BrO radicals, respectively. Reaction 1 was studied under pseudo-first-order conditions in IO with an excess of BrO between 204 and 388 K at total pressures of 6-15 Torr. The Arrhenius expression obtained for non-iodine atom producing channels is k1a(T) = (2.5 ± 1.0) × 10-11 exp[(260 ± 100)/T] cm3 molecule-1 s-1 independent of pressure. The rate coefficient for the reaction BrO + BrO → products (2) and the UV absorption cross sections of BrO as a function of temperature were also determined as part of this study. The implications of these results to the loss rate of stratospheric ozone are discussed.
