1
|
Ben Nasr F, Alata I, Scuderi D, Lepère V, Brenner V, Jaïdane NE, Zehnacker A. Effects of complexation with sulfuric acid on the photodissociation of protonated Cinchona alkaloids in the gas phase. Phys Chem Chem Phys 2019; 21:15439-15451. [PMID: 31257399 DOI: 10.1039/c9cp01518c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect of complexation with sulfuric acid on the photo-dissociation of protonated Cinchona alkaloids, namely cinchonidine (Cd), quinine (Qn) and quinidine (Qd), is studied by combining laser spectroscopy with quantum chemical calculations. The protonated complexes are structurally characterized in a room-temperature ion trap by means of infra-red multiple photon dissociation (IRMPD) spectroscopy in the fingerprint and the ν(XH) (X = C, N, O) stretch regions. Comparison with density functional theory calculations including dispersion (DFT-D) unambiguously shows that the complex consists of a doubly protonated Cinchona alkaloid strongly bound to a bisulfate HSO4- anion, which bridges the two protonated sites of the Cinchona alkaloid. UV excitation of the complex does not induce loss of specific photo fragments, in contrast to the protonated monomer or dimer, for which photo-specific fragments were observed. Indeed the UV-induced fragmentation pattern is identical to that observed in collision-induced dissociation experiments. Analysis of the nature of the first electronic transitions at the second order approximate coupled-cluster level (CC2) explains the difference in the behavior of the complex relative to the monomer or dimer towards UV excitation.
Collapse
Affiliation(s)
- Feriel Ben Nasr
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France. and Laboratoire de Spectroscopie Atomique, Moléculaire et Applications (LSAMA) Université de Tunis El Manar, LSAMA, Tunis 1060, Tunisia
| | - Ivan Alata
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France.
| | - Debora Scuderi
- Univ. Paris-Sud, Laboratoire de Chimie Physique, UMR 8000, and CNRS, Orsay, F-91405, France
| | - Valeria Lepère
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France.
| | | | - Nejm-Eddine Jaïdane
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications (LSAMA) Université de Tunis El Manar, LSAMA, Tunis 1060, Tunisia
| | - Anne Zehnacker
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France.
| |
Collapse
|
2
|
Bouchet A, Klyne J, Ishiuchi SI, Dopfer O, Fujii M, Zehnacker A. Stereochemistry-dependent structure of hydrogen-bonded protonated dimers: the case of 1-amino-2-indanol. Phys Chem Chem Phys 2018; 20:12430-12443. [DOI: 10.1039/c8cp00787j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Stereochemistry effects on the structure of molecular aggregates are studied in the prototypical 1-amino-2-indanol. Conformer-selective IR-UV double resonance spectroscopy reveals how stereochemistry shapes its dimers.
Collapse
Affiliation(s)
- Aude Bouchet
- Laboratory for Chemistry and Life Science
- Institute of Innovative Research
- Tokyo Institute of Technology
- Yokohama
- Japan
| | - Johanna Klyne
- Institut für Optik und Atomare Physik
- Technische Universität Berlin
- Berlin
- Germany
| | - Shun-ichi Ishiuchi
- Laboratory for Chemistry and Life Science
- Institute of Innovative Research
- Tokyo Institute of Technology
- Yokohama
- Japan
| | - Otto Dopfer
- Institut für Optik und Atomare Physik
- Technische Universität Berlin
- Berlin
- Germany
| | - Masaaki Fujii
- Laboratory for Chemistry and Life Science
- Institute of Innovative Research
- Tokyo Institute of Technology
- Yokohama
- Japan
| | - Anne Zehnacker
- Institut des Sciences Moléculaires d’Orsay (ISMO)
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- F-91405 Orsay
| |
Collapse
|
3
|
Kumar S, Lucas B, Fayeton J, Scuderi D, Alata I, Broquier M, Barbu-Debus KL, Lepère V, Zehnacker A. Photofragmentation mechanisms in protonated chiral cinchona alkaloids. Phys Chem Chem Phys 2016; 18:22668-77. [DOI: 10.1039/c6cp04041a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Photo-fragmentation of protonated alkaloids results in C8–C9 cleavage accompanied or not by hydrogen migration, with a stereochemistry-dependent branching ratio.
Collapse
Affiliation(s)
- Sunil Kumar
- Institut des Sciences Moléculaires d'Orsay (ISMO)
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- France
| | - Bruno Lucas
- Institut des Sciences Moléculaires d'Orsay (ISMO)
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- France
| | - Jacqueline Fayeton
- Institut des Sciences Moléculaires d'Orsay (ISMO)
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- France
| | - Debora Scuderi
- Univ. Paris-Sud
- Laboratoire de Chimie Physique
- UMR8000, and CNRS
- Orsay
- France
| | - Ivan Alata
- Institut des Sciences Moléculaires d'Orsay (ISMO)
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- France
| | - Michel Broquier
- Institut des Sciences Moléculaires d'Orsay (ISMO)
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- France
| | - Katia Le Barbu-Debus
- Institut des Sciences Moléculaires d'Orsay (ISMO)
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- France
| | - Valeria Lepère
- Institut des Sciences Moléculaires d'Orsay (ISMO)
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- France
| | - Anne Zehnacker
- Institut des Sciences Moléculaires d'Orsay (ISMO)
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- France
| |
Collapse
|