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

Abstract : 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.
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Submitted on : Friday, February 16, 2018 - 1:44:48 PM
Last modification on : Saturday, June 25, 2022 - 10:29:35 PM
Long-term archiving on: : Sunday, May 6, 2018 - 5:50:20 AM


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Jennifer Anna Noble, Michel Broquier, Gilles Grégoire, Satchin Soorkia, Gustavo Ariel Pino, et al.. Tautomerism and electronic spectroscopy of protonated 1- and 2-aminonaphthalene.. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2018, 20 (9), pp.6134-6145. ⟨10.1039/C8CP00218E⟩. ⟨hal-01710813⟩



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