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Direct kinetic parameters for the reaction of Br atoms with neopentane
Author(s) -
Imrik K.,
Dóbé S.,
Bérces T.
Publication year - 2000
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/1097-4601(20010101)33:1<49::aid-kin6>3.0.co;2-t
Subject(s) - chemistry , neopentane , kinetic energy , arrhenius equation , activation energy , flash photolysis , thermodynamics , analytical chemistry (journal) , kinetics , reaction rate constant , organic chemistry , molecule , physics , quantum mechanics
Laser flash photolysis coupled with resonance fluorescence detection of Br atoms was employed to investigate the temperature dependence of the reaction Br + neo ‐C 5 H 12 (1) between 688 and 775 K. The following Arrhenius preexponential factor and activation energy were determined (±1 σ): A 1 = (6.89 ± 2.27) 10 14 cm 3 mol −1 s −1 and E A ,1 = 57.61 ± 2.05 kJ mol − − 1 The only other kinetic parameters reported for the reaction of Br atoms with neo ‐C 5 H 12 were obtained from competitive kinetic experiments relative to Br + C 2 H 6 . Comparison with our direct results is hampered by uncertainties in the kinetic data for the reference reaction that may need reinvestigation. The standard enthalpy of formation for the neo ‐C 5 H 11 radical was estimated to be 34.7 and 41.6 kJ mol −1 , depending on the value of the activation energy assumed for the reverse reaction neo ‐C 5 H 11 + HBr (−1). © 2000 John Wiley & Sons, Inc. Int J Chem Kinet 33: 49–55, 2001