Exotic Protonated Species Produced by UV-Induced Photofragmentation of a Protonated Dimer: Metastable Protonated Cinchonidine
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- 作者：Ivan Alata ; Debora Scuderi ; Valeria Lepere ; Vincent Steinmetz ; Fabrice Gobert ; Lo茂c Thiao-Layel ; Katia Le Barbu-Debus ; Anne Zehnacker-Rentien
- 刊名：Journal of Physical Chemistry A
- 出版年：2015
- 出版时间：October 1, 2015
- 年：2015
- 卷：119
- 期：39
- 页码：10007-10015
- 全文大小：463K
- ISSN：1520-5215
文摘
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.