Kinetics of the C₆H₅ + NO association reaction

The rate constants for the C₆H₅ + NO → C₆H₅NO reaction have been measured with the cavity-ring-down method between 298 and 500 K to be k = 10^-11.35±0.06 exp[(+433 ± 111)/T] cm³/s. The effect of pressure was examined at 388 K by sextupling of the total pressure from 20 to 120 Torr, with no significant increase in the measured rate constants within the scatter of the data. This is consistent with the k/k^∞ ratio predicted for 388 K using the known literature value of k^∞ for the unimolecular decomposition of nitrosobenzene. Our result for C₆H₅ + NO compares reasonably with the values for other R^· + NO association reactions.