Influence of the N atom and its position on electron photodetachment of deprotonated indole and azaindole

Jennifer A. Noble, Ernesto Marceca, Claude Dedonder, Christophe Jouvet

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Electron photodetachment of cold deprotonated indole and azaindole anions has been studied by use of a mass-selective photofragmentation spectrometer capable of negative ion and neutral particle detection. The electron affinities of the indolyl radical and the 5-, 6- A nd 7-azaindolyl radicals have been measured with an uncertainty of less than 0.002 eV. The presence of the nitrogen atom in the six-membered ring of the azaindolide anions stabilises the electron by 0.3 to 0.4 eV, i.e. about 10-15%, compared to the indolide anion. No fragmentation was observed in either the anionic or radical forms of the species studied. The appearance of dipole-bound states in the spectra of deprotonated 6- A nd 7-azaindole anions allowed us to analyse the vibrational structure of the neutral 6- A nd 7-azaindolyl radicals produced following photodetachment. Although no dipole-bound states were clearly identified for deprotonated indole or 5-azaindole, the shape of the photodetachment threshold suggests the presence of a very weakly dipole-bound state or dipole resonance, which cannot be resolved with our laser resolution.

Original languageEnglish
Pages (from-to)27290-27299
Number of pages10
JournalPhysical Chemistry Chemical Physics
Issue number46
StatePublished - Dec 14 2020
Externally publishedYes


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