Rate Constant for the Reaction of O(3P) with Pyridine from 323 to 473 K

Article abstract of DOI:10.1021/j150642a033

Reactive mixtures O(³P) plus pyridine were produced and studied in our fast-flow discharge apparatus.Several chemiluminescent radiations were identified as the electronic transitions CH(A²Δ-X²Π), OH(AΣ⁺-X²Π), and CN(B²Σ⁺-X²Σ⁺) and their band intensities recorded as a function of the pyridine concentration.By using pseudo-first-order conditions we measured the rate constant for the initial reaction via the chemiluminescent detection of oxygen atoms with NO.Over the temperature range of 323-473 K the measured rate constants are well represented by the Arrhenius expression: k/(cm³ mol^-1 s^-1) = <(2.9 +/- 0.3) X 10¹²> exp<-(2500 +/- 300)/RT>.A comparison with the analogous O + benzene reaction is made including some comments on the electrophilic attack of both aromatic rings by the oxygen atom.