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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Possible heterocyclic ions in the reaction zones of flames with added nitrogen or sulfur

T McAllister

Australian Journal of Chemistry 37(3) 511 - 516
Published: 1984

Abstract

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.

https://doi.org/10.1071/CH9840511

© CSIRO 1984

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