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Absolute rate constants for the reactions between amino and alkyl radicals at 298 K

✍ Scribed by M. Demissy; R. Lesclaux

Publisher: John Wiley and Sons
Year: 1982
Tongue: English
Weight: 606 KB
Volume: 14
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550140102

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✦ Synopsis

Abstract

The absolute rate constants for the reactions of NH~2~ radicals with ethyl, isopropyl, and t‐butyl radicals have been measured at 298 K, using a flash photolysis–laser resonance absorption method. Radicals were generated by flashing ammonia in the presence of an olefin. A new measurement of the NH~2~ extinction coefficient and oscillator strength at 597.73 nm was performed. The decay curves were simulated by adjusting the rate constants of both the reaction of NH~2~ with the alkyl radical and the mutual interactions of alkyl radicals. The results are k(NH~2~ + alkyl) = 2.5 (±0.5), 2.0 (±0.4), and 2.5 (±0.5) × 10^10^ M^−1^·s^−1^ for ethyl, isopropyl, and t‐butyl radicals, respectively. The best simulations were obtained when taking k(alkyl + alkyl) = 1.2, 0.6, and 0.65 × 10^10^M^−1^·s^−1^ for ethyl, isopropyl, and t‐butyl radicals, respectively, in good agreement with literature values.

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