Exotic Protonated Species Produced by UV-Induced Photofragmentation of a Protonated Dimer: Metastable Protonated Cinchonidine.
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.
Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ Paris-Sud, Université Paris Saclay , F-91405 Orsay, France.
Ivan
I
Alata
Laboratoire de Chimie Physique (LCP), CNRS, Univ Paris-Sud, Université Paris Saclay, F-91405 Orsay, France.
Debora
D
Scuderi
Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ Paris-Sud, Université Paris Saclay , F-91405 Orsay, France.
Valeria
V
Lepere
Laboratoire de Chimie Physique (LCP), CNRS, Univ Paris-Sud, Université Paris Saclay, F-91405 Orsay, France.
Vincent
V
Steinmetz
Laboratoire de Chimie Physique (LCP), CNRS, Univ Paris-Sud, Université Paris Saclay, F-91405 Orsay, France.
Fabrice
F
Gobert
Laboratoire de Chimie Physique (LCP), CNRS, Univ Paris-Sud, Université Paris Saclay, F-91405 Orsay, France.
Loïc
L
Thiao-Layel
Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ Paris-Sud, Université Paris Saclay , F-91405 Orsay, France.
Katia
K
Le Barbu-Debus
Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ Paris-Sud, Université Paris Saclay , F-91405 Orsay, France.
Anne
A
Zehnacker-Rentien
D002930:Cinchona Alkaloids / Q000737:chemistry* / Q000528:radiation effects; D019281:Dimerization; D015394:Molecular Structure; D011522:Protons; D011789:Quantum Theory; D021241:Spectrometry, Mass, Electrospray Ionization; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D014466:Ultraviolet Rays
D002930:Cinchona Alkaloids; D011522:Protons; C041622:cinchonidine