Exotic Protonated Species Produced by UV-Induced Photofragmentation of a Protonated Dimer: Metastable Protonated Cinchonidine

The Journal of Physical Chemistry. a
Ivan AlataAnne Zehnacker-Rentien

Abstract

A metastable protonated cinchona alkaloid was produced in the gas phase by UV-induced photodissociation (UVPD) of its protonated dimer in a Paul ion trap. The infrared multiple photon dissociation (IRMPD) spectrum of the molecular ion formed by UVPD was obtained and compared to DFT calculations to characterize its structure. The protonation site obtained thereby is not accessible by classical protonation ways. The protonated monomer directly formed in the ESI source or by collision-induced dissociation (CID) of the dimer undergoes protonation at the most basic alkaloid nitrogen. In contrast, protonation occurs at the quinoline aromatic ring nitrogen in the UVPD-formed monomer.

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Citations

Aug 2, 2016·Physical Chemistry Chemical Physics : PCCP·Sunil KumarAnne Zehnacker
Apr 27, 2018·Physical Chemistry Chemical Physics : PCCP·Aude BouchetAnne Zehnacker
Jul 2, 2019·Physical Chemistry Chemical Physics : PCCP·Feriel Ben NasrAnne Zehnacker

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