Rates of Reaction of Propyl Radicals with Molecular Oxygen

Article abstract of DOI:10.1021/j150656a033

The rates of reaction of 1-propyl and 2-propyl radicals with O2 have been measured in the gas phase at romm temperature.The rate constants are k₁(1-C3H7+O2) = (5.5 +/-0.9)E-12 cm³ molecule^-1 s^-1 and K₂(2-C3H7+O2) = (14.1+/-2.4)E-12 cm³ molecule^-1 s^-1.Limited pressure studies suggest that both of these reactions are at or near their high-pressure limits at pressures of a few torr.The logarithms of these and previously measured rate constants show an excellent correlation with the ionization potential of the alkyl radical (Figure 2).Adiabatic channel model calculations have been carried out for these reactions with various long-range potential functions.It is concluded that some mixing of the charge-transfer surface (R⁺ + O2^-) into the neutral surface (R + O2) is responsible for the correlation of log (k) with ionization potential.