The Temperature Dependence of the Forward-Backward Reactions of the Addition of OH to Benzene, Aniline and Nitrobenzene

Summary

The temperature dependence of the reaction of OH with benzene, aniline and nitrobenzene has been investigated using the flash photolysis/ resonance fluorescence technique. The Solution of the according system of differential equations allows us to calculate the rate constants for the addition of OH to benzene (k(T) = (2.3+/−0.4) · 10⁻¹² exp(−(190+/−60)/T) cm³s⁻¹), aniline (k(T) = 1.7 · 10⁻¹¹ exp((440+/−40/T) cm³s⁻¹) and nitrobenzene (k(T) = (6+/−2) · 10 ⁻¹³ exp(−(560+/30)/T)cm³s⁻¹), the unimolecular decay of the adducts benzene OH (k(T) = 3.4 · 10¹² exp(−8200+/−700)/T) s⁻¹) and aniline-OH (k(T) = 6 · 10¹¹ exp(−(8400+/1100)/T) s⁻¹) back to the reactants and a further reaction path of the adduct aniline-OH not leading back to the reactants (k(T) = 8 · 10¹⁰ exp(−(7400+/−1100)/T) s⁻¹). The bond dissociation energies of OH to benzene and aniline in the adducts have been determined.