1
|
Bourgalais J, Mercier X, Al-Mogren MM, Hochlaf M. Accurate Prediction of Adiabatic Ionization Energies for PAHs and Substituted Analogues. J Phys Chem A 2023; 127:8447-8458. [PMID: 37773010 DOI: 10.1021/acs.jpca.3c04088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/30/2023]
Abstract
The accurate calculation of adiabatic ionization energies (AIEs) for polycyclic aromatic hydrocarbons (PAHs) and their substituted analogues is essential for understanding their electronic properties, reactivity, stability, and environmental/health implications. This study demonstrates that the M06-2X density functional theory method excels in predicting the AIEs of polycyclic aromatic hydrocarbons and related molecules, rivaling the (R)CCSD(T)-F12 method in terms of accuracy. These findings suggest that M06-2X, coupled with an appropriate basis set, represents a reliable and efficient method for studying polycyclic aromatic hydrocarbons and related molecules, aligning well with the experimental techniques. The set of molecules examined in this work encompasses numerous polycyclic aromatic hydrocarbons from m/z 67 up to m/z 1,176, containing heteroatoms that may be found in biofuels or nucleic acid bases, making the results highly relevant for photoionization experiments and mass spectrometry. For coronene-derivative molecular species with the C6n2H6n chemical formula, we give an expression to predict their AIEs (AIE (n) = 4.359 + 4.8743n-0.72057, in eV) upon extending the π-aromatic cloud until reaching graphene. In the long term, the application of this method is anticipated to contribute to a deeper understanding of the relationships between PAHs and graphene, guiding research in materials science and electronic applications and serving as a valuable tool for validating theoretical calculation methods.
Collapse
Affiliation(s)
| | | | - Muneerah Mogren Al-Mogren
- Department of Chemistry, College of Sciences, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Majdi Hochlaf
- Université Gustave Eiffel, COSYS/IMSE, 77454 Champs sur Marne, France
| |
Collapse
|
2
|
Laamiri K, Garcia GA, Nahon L, Ben Houria A, Feifel R, Hochlaf M. Threshold photoelectron spectroscopy of 9-methyladenine: theory and experiment. Phys Chem Chem Phys 2021; 24:3523-3531. [PMID: 34676858 DOI: 10.1039/d1cp03729c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
We present a combined experimental and theoretical study of single-photon ionization of 9-methyladenine (9MA) in the gas phase. In addition to tautomerism, several rotamers due to the rotation of the methyl group may exist. Computations show, however, that solely one rotamer contributes because of low population in the molecular beam and/or unfavorable Franck-Condon factors upon ionization. Experimentally, we used VUV radiation available at the DESIRS beamline of the synchrotron radiation facility SOLEIL to record the threshold photoelectron spectrum of this molecule between 8 and 11 eV. This spectrum consists of a well-resolved band assigned mainly to vibronic levels of the D0 cationic state, plus a contribution from the D1 state, and two large bands corresponding to the D1, D2 and D3 electronically excited states. The adiabatic ionization energy of 9MA is measured at 8.097 ± 0.005 eV in close agreement with the computed value using the explicitly correlated coupled cluster approach including core valence, scalar relativistic and zero-point vibrational energy corrections. This work sheds light on the complex pattern of the lowest doublet electronic states of 9MA+. The comparison to canonical adenine reveals that methylation induces further electronic structure complication that may be important to understand the effects of ionizing radiation and the charge distribution in these biological entities at different time scales.
Collapse
Affiliation(s)
- K Laamiri
- Université Gustave Eiffel, COSYS/LISIS, 5 Bd Descartes 77454, Champs-sur-Marne, France. .,Laboratoire de Spectroscopie Atomique, Moléculaire et Applications - LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - G A Garcia
- Synchrotron SOLEIL, L'orme des Merisiers, Saint-Aubin - BP 48 - 91192 Gif-sur-Yvette Cedex, France
| | - L Nahon
- Synchrotron SOLEIL, L'orme des Merisiers, Saint-Aubin - BP 48 - 91192 Gif-sur-Yvette Cedex, France
| | - A Ben Houria
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications - LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - R Feifel
- University of Gothenburg, Department of Physics, 412 58 Gothenburg, Sweden
| | - M Hochlaf
- Université Gustave Eiffel, COSYS/LISIS, 5 Bd Descartes 77454, Champs-sur-Marne, France.
| |
Collapse
|
3
|
Bourgalais J, Gouid Z, Herbinet O, Garcia GA, Arnoux P, Wang Z, Tran LS, Vanhove G, Hochlaf M, Nahon L, Battin-Leclerc F. Isomer-sensitive characterization of low temperature oxidation reaction products by coupling a jet-stirred reactor to an electron/ion coincidence spectrometer: case of n-pentane. Phys Chem Chem Phys 2020; 22:1222-1241. [DOI: 10.1039/c9cp04992d] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using a tunable vacuum ultraviolet synchrotron beam line and first principle computations, a jet-stirred reactor was coupled for the first time to a photoionization mass spectrometer using electron/ion coincidence imaging.
Collapse
Affiliation(s)
- Jérémy Bourgalais
- LATMOS/IPSL
- UVSQ Université Paris-Saclay
- Sorbonne Université
- CNRS
- Guyancourt
| | - Zied Gouid
- Université Gustave Eiffel
- COSYS/LISIS
- Champs sur Marne
- France
| | - Olivier Herbinet
- CNRS
- Université de Lorraine
- Laboratoire Réactions et Génie des Procédés
- UPR 3349
- Nancy F-54000
| | - Gustavo A. Garcia
- Synchrotron SOLEIL
- L’Orme des Merisiers
- 91192 Gif-sur-Yvette Cedex
- France
| | | | - Zhandong Wang
- National Synchrotron Radiation Laboratory
- University of Science and Technology of China
- Hefei
- People's Republic of China
| | - Luc-Sy Tran
- Physicochimie des Processus de Combustion et de l’Atmosphère (PC2A)
- UMR 8522 CNRS
- Université de Lille
- F-59000 Lille
- France
| | - Guillaume Vanhove
- Physicochimie des Processus de Combustion et de l’Atmosphère (PC2A)
- UMR 8522 CNRS
- Université de Lille
- F-59000 Lille
- France
| | - Majdi Hochlaf
- Université Gustave Eiffel
- COSYS/LISIS
- Champs sur Marne
- France
| | - Laurent Nahon
- Synchrotron SOLEIL
- L’Orme des Merisiers
- 91192 Gif-sur-Yvette Cedex
- France
| | | |
Collapse
|
4
|
Gouid Z, Röder A, Cunha de Miranda BK, Gaveau MA, Briant M, Soep B, Mestdagh JM, Hochlaf M, Poisson L. Energetics and ionization dynamics of two diarylketone molecules: benzophenone and fluorenone. Phys Chem Chem Phys 2019; 21:14453-14464. [PMID: 31210192 DOI: 10.1039/c9cp02385b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Single photon ionization and subsequent unimolecular ion decomposition were studied on jet-cooled benzophenone and fluorenone separately, using VUV synchrotron radiation in a photoion/photoelectron coincidence setup. Slow PhotoElectron Spectra (SPES) were recorded in coincidence with either the parent or the fragment ions for hν < 12.5 eV. Dissociative ionization is observed for benzophenone only. The full interpretation of the measurements, including the identification of the neutral and ionic species when dissociative ionization is at play, benefits from high level ab initio computations for determining the equilibrium structures and the energetics of the neutral and ionized molecules and of their fragments. Electronically excited states of the parent molecular ions were calculated also. From this analysis, an accurate experimental determination of the energetics of the benzophenone and fluorenone ions and of their fragmentation channels is available: adiabatic ionization energies of benzophenone at 8.923 ± 0.005 eV and of fluorenone at 8.356 ± 0.007 eV; and appearance energies of benzophenone fragment ions at 11.04 ± 0.02 eV (loss of C6H5), 11.28 ± 0.02 eV (loss of H) and 11.45 ± 0.02 eV (loss of CO). The corresponding fragmentation mechanisms are explored, showing likely concerted bonds rearrangement. Possible pre-ionizing fragmentation is discussed in light of the spectra presented. The structural rigidity of fluorenone diarylketone seems to be the origin of the inhibition of the fragmentation of its cation.
Collapse
Affiliation(s)
- Zied Gouid
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France.
| | - Anja Röder
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France. and Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | | | - Marc-André Gaveau
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France.
| | - Marc Briant
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France.
| | - Benoît Soep
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France.
| | - Jean-Michel Mestdagh
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France.
| | - Majdi Hochlaf
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France.
| | - Lionel Poisson
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France.
| |
Collapse
|
5
|
Derbali I, Hrodmarsson HR, Gouid Z, Schwell M, Gazeau MC, Guillemin JC, Hochlaf M, Alikhani ME, Zins EL. Photoionization and dissociative photoionization of propynal in the gas phase: theory and experiment. Phys Chem Chem Phys 2019; 21:14053-14062. [PMID: 30652173 DOI: 10.1039/c8cp06751a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Propynal (HCCCHO) is a complex organic compound (COM) of astrochemical and astrobiological interest. We present a combined theoretical and experimental investigation on the single photon ionization of gas-phase propynal, in the 10 to 15.75 eV energy range. Fragmentation pathways of the resulting cation were investigated both theoretically and experimentally. The adiabatic ionization energy (AIE) has been measured to be AIEexp = 10.715 ± 0.005 eV using tunable VUV synchrotron radiation coupled with a double imaging photoelectron photoion coincidence (i2PEPICO) spectrometer. In the energy range under study, three fragments formed by dissociative photoionization were identified experimentally: HC3O+, HCO+ and C2H2+, and their respective appearance energies (AE) were found to be AE = 11.26 ± 0.03, 13.4 ± 0.3 and 11.15 ± 0.03 eV, respectively. Using explicitly correlated coupled cluster calculations and after inclusion of the zero point vibrational energy, core-valence and scalar relativistic effects, the AIE is calculated to be AIEcalc = 10.717 eV, in excellent agreement with the experimental finding. The appearance energies of the fragments were calculated using a similar methodological approach. To further interpret the observed vibrational structure, anharmonic frequencies were calculated for the fundamental electronic state of the propynal cation. Moreover, MRCI calculations were carried out to understand the population of excited states of the cationic species. This combined experimental and theoretical study will help to understand the presence and chemical evolution of propynal in the external parts of interstellar clouds where it has been observed.
Collapse
Affiliation(s)
- Imene Derbali
- MONARIS UMR 8233 CNRS, Sorbonne Université, 4 place Jussieu, 75252 Paris Cedex 5, France.
| | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Gomez Pinheiro GE, Ihmels H, Dohmen C. Mild Synthesis of Fluorosolvatochromic and Acidochromic 3-Hydroxy-4-pyridylisoquinoline Derivatives from Easily Available Substrates. J Org Chem 2019; 84:3011-3016. [PMID: 30701977 DOI: 10.1021/acs.joc.8b03272] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The reaction of sodium cyanate with benzo[ b]quinolizinium substrates at room temperature gave 3-hydroxy-4-pyridyl-isoquinoline derivatives in good yields. Presumably, the overall reaction proceeds through an ANRORC-type sequence, that is, addition of the nucleophile, ring opening, and ring closure. Preliminary photophysical investigation of the parent compound revealed a pronounced sensitivity of its emission properties toward solvent effects and the pH of the medium.
Collapse
Affiliation(s)
- Gabriel E Gomez Pinheiro
- Department of Chemistry and Biology, and Center of Micro and Nanochemistry and Engineering , University of Siegen , Adolf-Reichwein-Str. 2 , 57068 Siegen , Germany
| | - Heiko Ihmels
- Department of Chemistry and Biology, and Center of Micro and Nanochemistry and Engineering , University of Siegen , Adolf-Reichwein-Str. 2 , 57068 Siegen , Germany
| | - Christoph Dohmen
- Department of Chemistry and Biology, and Center of Micro and Nanochemistry and Engineering , University of Siegen , Adolf-Reichwein-Str. 2 , 57068 Siegen , Germany
| |
Collapse
|
7
|
Bellili A, Gouid Z, Gazeau MC, Bénilan Y, Fray N, Guillemin JC, Hochlaf M, Schwell M. Single photon ionization of methyl isocyanide and the subsequent unimolecular decomposition of its cation: experiment and theory. Phys Chem Chem Phys 2019; 21:26017-26026. [DOI: 10.1039/c9cp04310a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Methyl isocyanide, CH3NC, is a key compound in astrochemistry and astrobiology.
Collapse
Affiliation(s)
- A. Bellili
- Université Paris-Est
- Laboratoire Modélisation et Simulation Multi Echelle
- MSME UMR 8208 CNRS
- 77454 Marne-la-Vallée
- France
| | - Z. Gouid
- Université Paris-Est
- Laboratoire Modélisation et Simulation Multi Echelle
- MSME UMR 8208 CNRS
- 77454 Marne-la-Vallée
- France
| | - M. C. Gazeau
- Laboratoire Interuniversitaire des Systèmes Atmosphériques
- LISA
- UMR CNRS 7583
- Université Paris-Est-Créteil
- Université de Paris
| | - Y. Bénilan
- Laboratoire Interuniversitaire des Systèmes Atmosphériques
- LISA
- UMR CNRS 7583
- Université Paris-Est-Créteil
- Université de Paris
| | - N. Fray
- Laboratoire Interuniversitaire des Systèmes Atmosphériques
- LISA
- UMR CNRS 7583
- Université Paris-Est-Créteil
- Université de Paris
| | - J. C. Guillemin
- Univ Rennes
- Ecole Nationale Supérieure de Chimie de Rennes
- CNRS
- ISCR UMR6226
- F-35000 Rennes
| | - M. Hochlaf
- Université Paris-Est
- Laboratoire Modélisation et Simulation Multi Echelle
- MSME UMR 8208 CNRS
- 77454 Marne-la-Vallée
- France
| | - M. Schwell
- Laboratoire Interuniversitaire des Systèmes Atmosphériques
- LISA
- UMR CNRS 7583
- Université Paris-Est-Créteil
- Université de Paris
| |
Collapse
|
8
|
Zhao HY, Lau KC, Garcia GA, Nahon L, Carniato S, Poisson L, Schwell M, Al-Mogren MM, Hochlaf M. Unveiling the complex vibronic structure of the canonical adenine cation. Phys Chem Chem Phys 2018; 20:20756-20765. [PMID: 29989120 DOI: 10.1039/c8cp02930j] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Adenine, a DNA base, exists as several tautomers and isomers that are closely lying in energy and that may form a mixture upon vaporization of solid adenine. Indeed, it is challenging to bring adenine into the gas phase, especially as a unique tautomer. The experimental conditions were tuned to prepare a jet-cooled canonical adenine (9H-adenine). This isolated DNA base was ionized by single VUV photons from a synchrotron beamline and the corresponding slow photoelectron spectrum was compared to ab initio computations of the neutral and ionic species. We report the vibronic structure of the X+ 2A'' (D0), A+ 2A' (D1) and B+ 2A'' (D2) electronic states of the 9H adenine cation, from the adiabatic ionization energy (AIE) up to AIE + 1.8 eV. Accurate AIEs are derived for the 9H-adenine (X[combining tilde] 1A') + hν → 9H-adenine+ (X+ 2A'', A+ 2A', B+ 2A'') + e- transitions. Close to the AIE, we fully assign the rich vibronic structure solely to the 9H-adenine (X 1A') + hν → 9H-adenine+ (X+ 2A'') transition. Importantly, we show that the lowest cationic electronic states of canonical adenine are coupled vibronically. The present findings are important for understanding the effects of ionizing radiation and the charge distribution on this elementary building block of life, at ultrafast, short, and long timescales.
Collapse
Affiliation(s)
- Hong Yan Zhao
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Xiao B, Li YC, Yu XF, Cheng JB. Protic vs Aprotic Solvent Effect on Proton Transfer in 3-Hydroxyisoquinoline: A Theoretical Study. J Phys Chem A 2015; 119:11882-90. [DOI: 10.1021/acs.jpca.5b10180] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bo Xiao
- The
Laboratory of Theoretical and Computational Chemistry, School of Chemistry
and Chemical Engineering, Yantai University, Yantai 264005, China
| | - Yan-chun Li
- Institute
of Theoretical Chemistry, Jilin University, Changchun 130021, China
| | - Xue-fang Yu
- The
Laboratory of Theoretical and Computational Chemistry, School of Chemistry
and Chemical Engineering, Yantai University, Yantai 264005, China
| | - Jian-bo Cheng
- The
Laboratory of Theoretical and Computational Chemistry, School of Chemistry
and Chemical Engineering, Yantai University, Yantai 264005, China
| |
Collapse
|
10
|
Hochlaf M, Pan Y, Lau KC, Majdi Y, Poisson L, Garcia GA, Nahon L, Al Mogren MM, Schwell M. Vibrationally resolved photoelectron spectroscopy of electronic excited states of DNA bases: application to the ã state of thymine cation. J Phys Chem A 2015; 119:1146-53. [PMID: 25611856 DOI: 10.1021/acs.jpca.5b00466] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
For fully understanding the light-molecule interaction dynamics at short time scales, recent theoretical and experimental studies proved the importance of accurate characterizations not only of the ground (D0) but also of the electronic excited states (e.g., D1) of molecules. While ground state investigations are currently straightforward, those of electronic excited states are not. Here, we characterized the à electronic state of ionic thymine (T(+)) DNA base using explicitly correlated coupled cluster ab initio methods and state-of-the-art synchrotron-based electron/ion coincidence techniques. The experimental spectrum is composed of rich and long vibrational progressions corresponding to the population of the low frequency modes of T(+)(Ã). This work challenges previous numerous works carried out on DNA bases using common synchrotron and VUV-based photoelectron spectroscopies. We provide hence a powerful theoretical and experimental framework to study the electronic structure of ionized DNA bases that could be generalized to other medium-sized biologically relevant systems.
Collapse
Affiliation(s)
- Majdi Hochlaf
- Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Université Paris-Est , 5 bd Descartes, 77454 Marne-la-Vallée, France
| | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Majdi Y, Hochlaf M, Pan Y, Lau KC, Poisson L, Garcia GA, Nahon L, Al-Mogren MM, Schwell M. Theoretical and Experimental Photoelectron Spectroscopy Characterization of the Ground State of Thymine Cation. J Phys Chem A 2015; 119:5951-8. [DOI: 10.1021/jp510716c] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Youssef Majdi
- Laboratoire de Spectroscopie Atomique,
Moléculaire et Applications (LSAMA), Université de Tunis El Manar, Tunis, Tunisia
| | - Majdi Hochlaf
- Laboratoire
Modélisation et Simulation
Multi Echelle, MSME UMR 8208 CNRS, Université Paris-Est, 5 bd Descartes, 77454 Marne-la-Vallée, France
| | - Yi Pan
- Department of Biology and
Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Kai-Chung Lau
- Department of Biology and
Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Lionel Poisson
- Laboratoire Francis
Perrin, CNRS URA 2453, CEA, IRAMIS, Laboratoire
Interactions
Dynamique et Lasers, Bât 522, F-91191 Gif/Yvette, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’orme des Merisiers, Saint-Aubin, BP 48 91192 Gif-sur-Yvette Cedex France
| | - Laurent Nahon
- Synchrotron SOLEIL, L’orme des Merisiers, Saint-Aubin, BP 48 91192 Gif-sur-Yvette Cedex France
| | - Muneerah Mogren Al-Mogren
- Chemistry Department, Faculty of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Kingdom of Saudi Arabia
| | - Martin Schwell
- Laboratoire Interuniversitaire
des Systèmes
Atmosphériques (LISA), UMR 7583 CNRS, Universités Paris-Est Créteil et Paris Diderot, Institut Pierre et Simon Laplace, 61 Avenue du
Général de Gaulle, 94010 Créteil, France
| |
Collapse
|
12
|
Bellili A, Schwell M, Bénilan Y, Fray N, Gazeau MC, Mogren Al-Mogren M, Guillemin JC, Poisson L, Hochlaf M. VUV photoionization and dissociative photoionization of the prebiotic molecule acetyl cyanide: theory and experiment. J Chem Phys 2014; 141:134311. [PMID: 25296810 DOI: 10.1063/1.4896987] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The present combined theoretical and experimental investigation concerns the single photoionization of gas-phase acetyl cyanide and the fragmentation pathways of the resulting cation. Acetyl cyanide (AC) is inspired from both the chemistry of cyanoacetylene and the Strecker reaction which are thought to be at the origin of medium sized prebiotic molecules in the interstellar medium. AC can be formed by reaction from cyanoacetylene and water but also from acetaldehyde and HCN or the corresponding radicals. In view of the interpretation of vacuum ultraviolet (VUV) experimental data obtained using synchrotron radiation, we explored the ground potential energy surface (PES) of acetyl cyanide and of its cation using standard and recently implemented explicitly correlated methodologies. Our PES covers the regions of tautomerism (between keto and enol forms) and of the lowest fragmentation channels. This allowed us to deduce accurate thermochemical data for this astrobiologically relevant molecule. Unimolecular decomposition of the AC cation turns out to be very complex. The implications for the evolution of prebiotic molecules under VUV irradiation are discussed.
Collapse
Affiliation(s)
- A Bellili
- Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Université Paris-Est, 5 bd Descartes, 77454 Marne-la-Vallée, France
| | - M Schwell
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR 7583 CNRS, Institut Pierre et Simon Laplace, Universités Paris-Est Créteil et Paris Diderot, 61 Avenue du Général de Gaulle, 94010 Créteil, France
| | - Y Bénilan
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR 7583 CNRS, Institut Pierre et Simon Laplace, Universités Paris-Est Créteil et Paris Diderot, 61 Avenue du Général de Gaulle, 94010 Créteil, France
| | - N Fray
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR 7583 CNRS, Institut Pierre et Simon Laplace, Universités Paris-Est Créteil et Paris Diderot, 61 Avenue du Général de Gaulle, 94010 Créteil, France
| | - M-C Gazeau
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR 7583 CNRS, Institut Pierre et Simon Laplace, Universités Paris-Est Créteil et Paris Diderot, 61 Avenue du Général de Gaulle, 94010 Créteil, France
| | - M Mogren Al-Mogren
- Chemistry Department, Faculty of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Kingdom of Saudi Arabia
| | - J-C Guillemin
- Institut des Sciences Chimiques de Rennes, Ecole Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, Allée de Beaulieu, CS 50837, 35708 Rennes Cedex 7, France
| | - L Poisson
- Laboratoire Francis Perrin, CNRS URA 2453, CEA, IRAMIS, Laboratoire Interactions Dynamique et Lasers, Bât 522, F-91191 Gif/Yvette, France
| | - M Hochlaf
- Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Université Paris-Est, 5 bd Descartes, 77454 Marne-la-Vallée, France
| |
Collapse
|
13
|
Joshi NK, Arora P, Pant S, Joshi HC. Slow excited state phototautomerization in 3-hydroxyisoquinoline. Photochem Photobiol Sci 2014; 13:929-38. [PMID: 24727943 DOI: 10.1039/c3pp50356a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the present work we report the spectral and photophysical properties of 3-hydroxyisoquinoline in various protic/aprotic solvents. Our steady state and time resolved fluorescence data indicates that in the monomer form of 3HIQ phototautomerization can take place in the excited state through excited state intramolecular proton, while as per earlier suggestions phototautomerization in 3HIQ occurs in dimer or complex (in the presence of acetic acid) form. Moreover, we find rather slow tautomerization (occurring on the nanosecond scale). It is found that proton transfer occurs both in the ground as well as excited states and is controlled by the polarity of the solvent.
Collapse
Affiliation(s)
- Neeraj Kumar Joshi
- Photophysics Laboratory, Department of Physics, DSB Campus, Kumaun University, Nainital 263002, Uttarakhand, India
| | | | | | | |
Collapse
|
14
|
Substituent effects on vibrational and electronic excitation spectra of pyridone tautomers and ions: The case of the cyano group. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.06.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
15
|
Schwell M, Hochlaf M. Photoionization Spectroscopy of Nucleobases and Analogues in the Gas Phase Using Synchrotron Radiation as Excitation Light Source. Top Curr Chem (Cham) 2014; 355:155-208. [DOI: 10.1007/128_2014_550] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
|
16
|
Touboul D, Gaie-Levrel F, Garcia GA, Nahon L, Poisson L, Schwell M, Hochlaf M. VUV photoionization of gas phase adenine and cytosine: A comparison between oven and aerosol vaporization. J Chem Phys 2013; 138:094203. [DOI: 10.1063/1.4793734] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|