The Gas Phase Exchange Reaction between HBr and Br2

Jacobson, Homer

doi:10.1063/1.1747832

Cited by 2 publications

(1 citation statement)

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“…Jacobson [16] working at a total pressure of 1 mm observed a half time of about 0.5 sec for the exchange Brt + HBr* + BrBr* + HBr. This observation implies a rate constant of about 10,000 l./mole-sec if the reaction is homogeneous, but he observed acceleration by glass wool.…”

Section: Effects Of Different Halogensmentioning

confidence: 99%

Reactions of halogens with hydrogen halides. Studies in the Cl₂ + HBr system

Wen

Noyes

1974

Int J of Chemical Kinetics

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The following net processes occur in a system containing chlorine and hydrogen bromide :(1)These reactions have been followed spectrophotometrically in a gas phase stopped flow apparatus. The first two reactions are strongly surface catalyzed on untreated glass or quartz, but are much slower if the cell surface has been covered with silicone and photochlorinated. Rates in such systems are first order in each reactant, and comparable limiting rate constants have been obtained in cells with different methods of preparing the surfaces and with different surface-to-volume ratios. These experimental rate constants must be equal to or greater than those of the homogeneous bimolecular reactions. Then limiting rate constants at 35°C in liters per mole per second are kl 5 0.8, kz 2 15, and k3 5 0.04. Reactions of HI with (212, Br2, and IC1 are all much faster than reaction (2).These observations and those of other diatomic molecule reactions can be rationalized if halogen and hydrogen halide molecules react through a transition state in which the hydrogen atom is near the center of a triangle of three halogen atoms.

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Section: Effects Of Different Halogensmentioning

confidence: 99%

Reactions of halogens with hydrogen halides. Studies in the Cl₂ + HBr system

Wen

Noyes

1974

Int J of Chemical Kinetics

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Chemical Kinetics of Atomic Bromine from Nuclear Isomeric Transition

Hamill

Young

1952

The Journal of Chemical Physics

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Chemical evidence indicates that the nuclear isomeric transition of Br80 is completely converted. Although isomeric transition always produces C–Br bond rupture in CH3Br(g) it often fails to rupture HBr(g). Other results are consistent with the interpretation that daughter Br80 particles, following bond rupture, usually become free, thermal atoms. Their kinetic behavior with C2H4–HBr mixtures corresponds to the analogous Br79(n, γ)Br80 kinetics (R. R. Williams and W. H. Hamill, J. Chem. Phys. 18, 783 (1950)). Using daughter Br80 it is shown that bromine addition at the C=C double bond does not involve the Br3 complex. The HBr82–Br2 exchange was found to be complete in two minutes.

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The Gas Phase Exchange Reaction between HBr and Br2

Cited by 2 publications

References 4 publications

Reactions of halogens with hydrogen halides. Studies in the Cl₂ + HBr system

Reactions of halogens with hydrogen halides. Studies in the Cl₂ + HBr system

Chemical Kinetics of Atomic Bromine from Nuclear Isomeric Transition

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The Gas Phase Exchange Reaction between HBr and Br2

Cited by 2 publications

References 4 publications

Reactions of halogens with hydrogen halides. Studies in the Cl2 + HBr system

Reactions of halogens with hydrogen halides. Studies in the Cl2 + HBr system

Chemical Kinetics of Atomic Bromine from Nuclear Isomeric Transition

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Product

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Reactions of halogens with hydrogen halides. Studies in the Cl₂ + HBr system

Reactions of halogens with hydrogen halides. Studies in the Cl₂ + HBr system