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Pino GA, Oldani AN, Marceca E, Fujii M, Ishiuchi SI, Miyazaki M, Broquier M, Dedonder C, Jouvet C. Excited state hydrogen transfer dynamics in substituted phenols and their complexes with ammonia: ππ∗-πσ∗ energy gap propensity and ortho-substitution effect. J Chem Phys 2010; 133:124313. [DOI: 10.1063/1.3480396] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Affiliation(s)
- M. Esboui
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Département de Physique, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia, Laboratoire de Photophysique Moléculaire du CNRS et Centre laser de l’Université Paris-Sud (CLUPS), Université Paris-Sud 11, 91405 Orsay, France, and Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - C. Jouvet
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Département de Physique, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia, Laboratoire de Photophysique Moléculaire du CNRS et Centre laser de l’Université Paris-Sud (CLUPS), Université Paris-Sud 11, 91405 Orsay, France, and Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - C. Dedonder
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Département de Physique, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia, Laboratoire de Photophysique Moléculaire du CNRS et Centre laser de l’Université Paris-Sud (CLUPS), Université Paris-Sud 11, 91405 Orsay, France, and Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - T. Ebata
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Département de Physique, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia, Laboratoire de Photophysique Moléculaire du CNRS et Centre laser de l’Université Paris-Sud (CLUPS), Université Paris-Sud 11, 91405 Orsay, France, and Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
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Carrera A, Nielsen IB, Carçabal P, Dedonder C, Broquier M, Jouvet C, Domcke W, Sobolewski AL. Biradicalic excited states of zwitterionic phenol-ammonia clusters. J Chem Phys 2009; 130:024302. [PMID: 19154023 DOI: 10.1063/1.3054292] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Phenol-ammonia clusters with more than five ammonia molecules are proton transferred species in the ground state. In the present work, the excited states of these zwitterionic clusters have been studied experimentally with two-color pump probe methods on the nanosecond time scale and by ab initio electronic-structure calculations. The experiments reveal the existence of a long-lived excited electronic state with a lifetime in the 50-100 ns range, much longer than the excited state lifetime of bare phenol and small clusters of phenol with ammonia. The ab initio calculations indicate that this long-lived excited state corresponds to a biradicalic system, consisting of a phenoxy radical that is hydrogen bonded to a hydrogenated ammonia cluster. The biradical is formed from the locally excited state of the phenolate anion via an electron transfer process, which neutralizes the charge separation of the ground state zwitterion.
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Affiliation(s)
- A Carrera
- University of Buenos Aires, Ciudad Universitaria, 3er piso, Pab. II, 1428 Buenos Aires, Argentina
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Grégoire G, Jouvet C, Dedonder C, Sobolewski A. On the role of dissociative πσ* states in the photochemistry of protonated tryptamine and tryptophan: An ab initio study. Chem Phys 2006. [DOI: 10.1016/j.chemphys.2005.11.005] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Antoine R, Broyer M, Chamot-Rooke J, Dedonder C, Desfrançois C, Dugourd P, Grégoire G, Jouvet C, Onidas D, Poulain P, Tabarin T, van der Rest G. Comparison of the fragmentation pattern induced by collisions, laser excitation and electron capture. Influence of the initial excitation. Rapid Commun Mass Spectrom 2006; 20:1648-52. [PMID: 16637002 DOI: 10.1002/rcm.2489] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Collision-induced dissociation, laser-induced dissociation and electron-capture dissociation are compared on a singly and doubly protonated pentapeptide. The dissociation spectrum depends on the excitation mechanism and on the charge state of the peptide. The comparison of these results with the conformations obtained from Monte Carlo simulations suggests that the de-excitation mechanism following a laser or an electron-capture excitation is related to the initial geometry of the peptide.
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Affiliation(s)
- R Antoine
- Laboratoire de Spectrométrie Ionique et Moléculaire, UMR 5579 (Université Lyon I et CNRS), 43 Bd du 11 Novembre 1918, 69622 Villeurbanne cedex, France
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