Tautomerism and electronic spectroscopy of protonated 1- and 2-aminonaphthalene

Jennifer A. Noble, Michel Broquier, Gilles Grégoire, Satchin Soorkia, Gustavo Pino, Ernesto Marceca, Claude Dedonder-Lardeux, Christophe Jouvet

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10 Scopus citations


Experimental and theoretical investigations of the excited states of protonated 1- and 2-aminonaphthalene are presented. The electronic spectra are obtained by laser induced photofragmentation of the ions captured in a cold ion trap. Using ab initio calculations, the electronic spectra can be assigned to different tautomers which have the proton on the amino group or on the naphthalene moiety. It is shown that the tautomer distribution can be varied by changing the electrospray source conditions, favoring either the most stable form in solution (amino protonation) or that in the gas phase (aromatic ring protonation). Calculations for larger amino-polyaromatics predict that these systems should behave as "proton sponges" i.e. have a proton affinity larger than 11 eV.

Original languageEnglish
Pages (from-to)6134-6145
Number of pages12
JournalPhysical Chemistry Chemical Physics
Issue number9
StatePublished - 2018
Externally publishedYes


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