Electronic spectroscopy of protonated 1-aminopyrene in a cold ion trap

Noble Jennifer Anna (1) , Dedonder-Lardeux Claude (2) , Mascetti Joëlle (1) , Jouvet Christophe (2)

1 ISM - Institut des Sciences Moléculaires
2 PIIM - Physique des interactions ioniques et moléculaires

carbon atom of the skeleton and on the amino group. In this work we study the photofragmentation of protonated 1-aminopyrene in a cold ion trap and observe mainly the protonated amino tautomer, leading to fragmentation pathways via loss of H or loss of NH3, Several excited states have been assigned, among which the fourth excited state shows broadened bands indicating a fast decay attributed to the presence of a * charge transfer state by comparison of the experimental results with ab-initio calculations. We show that we can deduce the * transition energy in protonated aromatic amino compounds of increasing size directly from the ionisation potential of the neutral aromatic unsubstituted molecule. Tautomers protonated on a carbon atom of the pyrene skeleton are also weakly observed, and we show that two tautomers protonated on a carbon atom of the aromatic ring can be distinguished by their electronic spectroscopy.

Domains: Physics [physics]; Physics [physics]; Atomic and Molecular Clusters [physics.atm-clus]

Noble Jennifer Anna, Dedonder-Lardeux Claude, Mascetti Joëlle, Jouvet Christophe. Electronic spectroscopy of protonated 1-aminopyrene in a cold ion trap. Chemistry an asian journal, 2017, ⟨10.1002/asia.201700327⟩. ⟨hal-01503852⟩