The temperature dependence of the rate constant for the reaction F+HBr→HF+Br

Rachel Edrei; Avigdor Persky

doi:10.1016/0009-2614(89)87245-8

The temperature dependence of the rate constant for the reaction F+HBr→HF+Br

Rachel Edrei, Avigdor Persky

Department of Chemistry

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Abstract

The ratio of rate constants k_F+HBr/k^F+H² has been determined by a discharge-flow-mass spectrometric technique and was found to be independent of temperature in the range 203 to 298 K. Based on reported results for k_F+H₂ it is concluded that kF_+HBr exhibits an Arrhenius temperature dependence in this temperature range. The present results indicate that the mechanism for the F+HBr reaction is probably a direct hydrogen atom abstraction, rather than one involving the formation of a FBrH complex, as suggested by Würzberg and Houston, who found a marked non-Arrhenius behavior for this reaction. The present results for F+HBr are consistent with our earlier results for the Cl+HBr reaction.

Original language	English
Pages (from-to)	265-270
Number of pages	6
Journal	Chemical Physics Letters
Volume	157
Issue number	3
DOIs	https://doi.org/10.1016/0009-2614(89)87245-8
State	Published - 5 May 1989

Bibliographical note

Funding Information:
This research was supported by the Fund for Basic Research Administered by The Israel Academy of Sciences and Humanities.

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title = "The temperature dependence of the rate constant for the reaction F+HBr→HF+Br",

abstract = "The ratio of rate constants kF+HBr/kF+H2 has been determined by a discharge-flow-mass spectrometric technique and was found to be independent of temperature in the range 203 to 298 K. Based on reported results for kF+H2 it is concluded that kF+HBr exhibits an Arrhenius temperature dependence in this temperature range. The present results indicate that the mechanism for the F+HBr reaction is probably a direct hydrogen atom abstraction, rather than one involving the formation of a FBrH complex, as suggested by W{\"u}rzberg and Houston, who found a marked non-Arrhenius behavior for this reaction. The present results for F+HBr are consistent with our earlier results for the Cl+HBr reaction.",

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T1 - The temperature dependence of the rate constant for the reaction F+HBr→HF+Br

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AU - Persky, Avigdor

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PY - 1989/5/5

Y1 - 1989/5/5

N2 - The ratio of rate constants kF+HBr/kF+H2 has been determined by a discharge-flow-mass spectrometric technique and was found to be independent of temperature in the range 203 to 298 K. Based on reported results for kF+H2 it is concluded that kF+HBr exhibits an Arrhenius temperature dependence in this temperature range. The present results indicate that the mechanism for the F+HBr reaction is probably a direct hydrogen atom abstraction, rather than one involving the formation of a FBrH complex, as suggested by Würzberg and Houston, who found a marked non-Arrhenius behavior for this reaction. The present results for F+HBr are consistent with our earlier results for the Cl+HBr reaction.

AB - The ratio of rate constants kF+HBr/kF+H2 has been determined by a discharge-flow-mass spectrometric technique and was found to be independent of temperature in the range 203 to 298 K. Based on reported results for kF+H2 it is concluded that kF+HBr exhibits an Arrhenius temperature dependence in this temperature range. The present results indicate that the mechanism for the F+HBr reaction is probably a direct hydrogen atom abstraction, rather than one involving the formation of a FBrH complex, as suggested by Würzberg and Houston, who found a marked non-Arrhenius behavior for this reaction. The present results for F+HBr are consistent with our earlier results for the Cl+HBr reaction.

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The temperature dependence of the rate constant for the reaction F+HBr→HF+Br

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