Thermal Decomposition of Benzyl Iodide and of Benzyl Radicals in Shock Waves

Article abstract of DOI:10.1021/j100328a020

The thermal decomposition of benzyl iodide into benzyl radicals + I was studied in shock waves by UV absorption spectroscopy.Rate constants k₁ = 10^14.78 exp(-181 kJ mol^-1/RT) s^-1 for the dissociation, and k₂ = 10^13.70 cm³ mol^-1 s^-1 for the reverse recombination of benzyl radicals and iodine atoms, were derived over the range 750 7 = 10^12.60(T/1000 K)^0.4 cm³ mol^-1 s^-1 was obtained together with a dibenzyl dissociation rate constant of k₈ = 10^14.9 exp(-250 kJ mol^-1/RT) s^-1 (temperature range 900 11 of benzyl radicals were then studied from 1250 up to 1900 K. k₁₁ is represented as the sum k₉ + k₁₀ with k₉ = 10^10.22 exp(-187 kJ mol^-1/RT) s^-1 and k₁₀ = 10^15.30 exp(-349.6 kJ mol^-1/RT) s^-1.The spectroscopic and kinetic properties at high temperatures of benzyl radicals derived from several different precursor molecules agree.