
%0 Journal Article
%A McAllister, T 
%T Possible heterocyclic ions in the reaction zones of flames with added nitrogen or sulfur
%J Australian Journal of Chemistry
%D 1984/03/01
%V 37
%N 3
%P 511-516
%K 
%R https://doi.org/10.1071/CH9840511
%U https://www.publish.csiro.au/paper/CH9840511 
%X Ions of m/z 80 and 94 are observed in the reaction zone of a C6H6/N2O/H2 flame, by flame ionization/mass spectroscopy. These are confirmed, by deuteration, as protonated pyridine and aniline. These ions are also detected in the reaction zone of a CH4/N2O flame, along with ions of m/z 44, 56, 68 and 72, which, it is proposed, are formed by protonation of the heterocyclic species aziridine, dihydroazete, pyrrole and pyrrolidine. This series of N-containing ions is in keeping with the postulate that HCN is formed in flames of hydrocarbons and N-compounds, and that the associated CN radicals undergo addition and hydrogenation reactions. Cyano compounds are not, however, detected, because their proton affinities tend to be lower than that of NH3. In a C6H2/CS2/H2 flame, a series of S-containing ions are observed, beginning at m/z 97, for which the thiopyrylium structure is proposed. The detection of this stable aromatic species is in contrast to the absence of protonated thiophene. It is postulated that the active S-containing species in this flame is CS. 
