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Villani L, Mohire NR, Robertson EG. When Phenyl and Cyclopropyl Rings Meet: Spectroscopic Shifts and Conformational Questions. J Phys Chem A 2023; 127:7557-7567. [PMID: 37650854 DOI: 10.1021/acs.jpca.3c04314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
The electronic and vibrational spectra of cyclopropylbenzene (CPB) and 1,3-bromocyclopropylbenzene (BrCPB) in the gas phase were investigated using quantum chemical calculations in combination with resonance-enhanced multi-photon ionization REMPI techniques including 1c-R2PI, UV-UV holeburning, and IR-UV ion depletion in the CH stretch region. The electronic spectra revealed the presence of a single conformer for both species, with the absence of any perpendicular conformer attributed to low computed barriers to conformer interconversion. Assignment of CPB to the bisected conformer was made through interpreting distinctive CH stretch bands in the IR-UV spectrum in conjunction with quantum chemical calculations. A local anharmonic model based on DFT calculations was adapted to reproduce the cyclopropyl CH stretch spectrum successfully. It was not feasible to definitively assign which bisected conformer of BrCPB was observed using vibrational information alone due to the close similarity of their predicted IR spectra. However, conformational sensitivity of the S1 ← S0 transition dipole moment (TDM) alignments leads to simulated rotational contours that display stark differences, which prompted assignment to the "B1" bisecting conformer with the cyclopropyl ring directed away from the bromine atom. The absence of the energetically comparable "B2" conformer is unexpected. The analysis of the convolution of aromatic and aliphatic modes serves as a basis for assignment in constrained aliphatic systems.
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Affiliation(s)
- Luigi Villani
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Nishit R Mohire
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Evan G Robertson
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
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Bruckhuisen J, Chawananon S, Kleiner I, Roucou A, Dhont G, Bracquart C, Asselin P, Cuisset A. Millimeter-Wave Spectroscopy of Methylfuran Isomers: Local vs. Global Treatments of the Internal Rotation. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27113591. [PMID: 35684523 PMCID: PMC9182110 DOI: 10.3390/molecules27113591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 05/22/2022] [Accepted: 05/25/2022] [Indexed: 11/22/2022]
Abstract
Methylfurans are methylated aromatic heterocyclic volatile organic compounds and primary or secondary pollutants in the atmosphere due to their capability to form secondary organic aerosols in presence of atmospheric oxidants. There is therefore a significant interest to monitor these molecules in the gas phase. High resolution spectroscopic studies of methylated furan compounds are generally limited to pure rotational spectroscopy in the vibrational ground state. This lack of results might be explained by the difficulties arisen from the internal rotation of the methyl group inducing non-trivial patterns in the rotational spectra. In this study, we discuss the benefits to assign the mm-wave rotational-torsional spectra of methylfuran with the global approach of the BELGI-Cs code compared to local approaches such as XIAM and ERHAM. The global approach reproduces the observed rotational lines of 2-methylfuran and 3-methylfuran in the mm-wave region at the experimental accuracy for the ground vt=0 and the first torsional vt=1 states with a unique set of molecular parameters. In addition, the V3 and V6 parameters describing the internal rotation potential barrier may be determined with a high degree of accuracy with the global approach. Finally, a discussion with other heterocyclic compounds enables the study of the influence of the electronic environment on the hindered rotation of the methyl group.
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Affiliation(s)
- Jonas Bruckhuisen
- LPCA, Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, UR4493, F-59140 Dunkerque, France; (J.B.); (A.R.); (G.D.); (C.B.)
| | - Sathapana Chawananon
- CNRS, MONARIS, UMR8233, Sorbonne gé, 4 Pl Jussieu, F-75005 Paris, France; (S.C.); (P.A.)
| | - Isabelle Kleiner
- CNRS UMR 7583, Laboratoire Interuniversitaire des Systèmes Atmosphériques, Université Paris Cité and Université Paris Est Créteil, F-75013 Paris, France;
| | - Anthony Roucou
- LPCA, Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, UR4493, F-59140 Dunkerque, France; (J.B.); (A.R.); (G.D.); (C.B.)
| | - Guillaume Dhont
- LPCA, Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, UR4493, F-59140 Dunkerque, France; (J.B.); (A.R.); (G.D.); (C.B.)
| | - Colwyn Bracquart
- LPCA, Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, UR4493, F-59140 Dunkerque, France; (J.B.); (A.R.); (G.D.); (C.B.)
| | - Pierre Asselin
- CNRS, MONARIS, UMR8233, Sorbonne gé, 4 Pl Jussieu, F-75005 Paris, France; (S.C.); (P.A.)
| | - Arnaud Cuisset
- LPCA, Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, UR4493, F-59140 Dunkerque, France; (J.B.); (A.R.); (G.D.); (C.B.)
- Correspondence:
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Bruckhuisen J, Dhont G, Roucou A, Jabri A, Bayoudh H, Tran TT, Goubet M, Martin-Drumel MA, Cuisset A. Intramolecular H-Bond Dynamics of Catechol Investigated by THz High-Resolution Spectroscopy of Its Low-Frequency Modes. Molecules 2021; 26:molecules26123645. [PMID: 34203730 PMCID: PMC8232127 DOI: 10.3390/molecules26123645] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 06/07/2021] [Accepted: 06/10/2021] [Indexed: 11/16/2022] Open
Abstract
Catechol is an oxygenated aromatic volatile organic compound and a biogenic precursor of secondary organic aerosols. Monitoring this compound in the gas phase is desirable due to its appreciable reactivity with tropospheric ozone. From a molecular point of view, this molecule is attractive since the two adjacent hydroxy groups can interchangeably act as donor and acceptor in an intramolecular hydrogen bonding due to the tunnelling between two symmetrically equivalent structures. Using synchrotron radiation, we recorded a rotationally-resolved Fourier Transform far-infrared (IR) spectrum of the torsional modes of the free and bonded -OH groups forming the intramolecular hydrogen bond. Additionally, the room temperature, pure rotational spectrum was measured in the 70–220 GHz frequency range using a millimeter-wave spectrometer. The assignment of these molecular transitions was assisted by anharmonic high-level quantum-chemical calculations. In particular, pure rotational lines belonging to the ground and the four lowest energy, vibrationally excited states were assigned. Splitting due to the tunnelling was resolved for the free -OH torsional state. A global fit combining the far-IR and millimeter-wave data provided the spectroscopic parameters of the low-energy far-IR modes, in particular those characterizing the intramolecular hydrogen bond dynamics.
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Affiliation(s)
- Jonas Bruckhuisen
- UR4493, LPCA, Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, F-59140 Dunkerque, France; (J.B.); (G.D.); (A.R.); (A.J.); (H.B.); (T.T.T.)
| | - Guillaume Dhont
- UR4493, LPCA, Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, F-59140 Dunkerque, France; (J.B.); (G.D.); (A.R.); (A.J.); (H.B.); (T.T.T.)
| | - Anthony Roucou
- UR4493, LPCA, Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, F-59140 Dunkerque, France; (J.B.); (G.D.); (A.R.); (A.J.); (H.B.); (T.T.T.)
| | - Atef Jabri
- UR4493, LPCA, Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, F-59140 Dunkerque, France; (J.B.); (G.D.); (A.R.); (A.J.); (H.B.); (T.T.T.)
| | - Hamdi Bayoudh
- UR4493, LPCA, Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, F-59140 Dunkerque, France; (J.B.); (G.D.); (A.R.); (A.J.); (H.B.); (T.T.T.)
| | - Thi Thanh Tran
- UR4493, LPCA, Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, F-59140 Dunkerque, France; (J.B.); (G.D.); (A.R.); (A.J.); (H.B.); (T.T.T.)
| | - Manuel Goubet
- UMR8523—PhLAM—Physique des Lasers Atomes et Molécules, Université de Lille, CNRS, F-59000 Lille, France;
| | | | - Arnaud Cuisset
- UR4493, LPCA, Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, F-59140 Dunkerque, France; (J.B.); (G.D.); (A.R.); (A.J.); (H.B.); (T.T.T.)
- Correspondence:
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Roucou A, Goubet M, Kleiner I, Bteich S, Cuisset A. Large Amplitude Torsions in Nitrotoluene Isomers Studied by Rotational Spectroscopy and Quantum Chemistry Calculations. Chemphyschem 2020; 21:2523-2538. [PMID: 32857456 DOI: 10.1002/cphc.202000591] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 08/27/2020] [Indexed: 11/12/2022]
Abstract
Rotational spectra of ortho-nitrotoluene (2-NT) and para-nitrotoluene (4-NT) have been recorded at low and room temperatures using a supersonic jet Fourier Transform microwave (MW) spectrometer and a millimeter-wave frequency multiplier chain, respectively. Supported by quantum chemistry calculations, the spectral analysis of pure rotation lines in the vibrational ground state has allowed to characterise the rotational energy, the hyperfine structure due to the 14 N nucleus and the internal rotation splittings arising from the methyl group. For 2-NT, an anisotropic internal rotation of coupled -CH3 and -NO2 torsional motions was identified by quantum chemistry calculations and discussed from the results of the MW analysis. The study of the internal rotation splittings in the spectra of three NT isomers allowed to characterise the internal rotation potentials of the methyl group and to compare them with other mono-substituted toluene derivatives in order to study the isomeric influence on the internal rotation barrier.
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Affiliation(s)
- Anthony Roucou
- Université du Littoral Côte d'Opale, UR 4493, LPCA, Laboratoire de Physico-Chimie de l'Atmosphère, F-59140, Dunkerque, France.,Institut de la Matière Condensée et des Nanosciences (IMCN), Université catholique de Louvain, Chemin du Cyclotron 2, 1348, Louvain-la-Neuve, Belgium
| | - Manuel Goubet
- Univ. Lille, CNRS, UMR8523 - PhLAM - Physique des Lasers Atomes et Molécules, F-59000, Lille, France
| | - Isabelle Kleiner
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), CNRS UMR 7583, Université Paris-Est Créteil & Université de Paris, Institut Pierre Simon Laplace (IPSL), 61 avenue du Général de Gaulle, F-94010, Créteil cedex, France
| | - Sabath Bteich
- Université du Littoral Côte d'Opale, UR 4493, LPCA, Laboratoire de Physico-Chimie de l'Atmosphère, F-59140, Dunkerque, France
| | - Arnaud Cuisset
- Université du Littoral Côte d'Opale, UR 4493, LPCA, Laboratoire de Physico-Chimie de l'Atmosphère, F-59140, Dunkerque, France
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Asselin P, Bruckhuisen J, Roucou A, Goubet M, Martin-Drumel MA, Jabri A, Belkhodja Y, Soulard P, Georges R, Cuisset A. Jet-cooled rovibrational spectroscopy of methoxyphenols using two complementary FTIR and QCL based spectrometers. J Chem Phys 2019; 151:194302. [PMID: 31757131 DOI: 10.1063/1.5128196] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Methoxyphenols (MPs) are a significant component of biomass burning emissions which mainly exists in our atmosphere in the gas phase where they contribute to the formation of secondary organic aerosols (SOAs). Rovibrational spectroscopy is a promising tool to monitor atmospheric MPs and infer their role in SOA formation. In this study, we bring a new perspective on the rovibrational analysis of MP isomers by taking advantage of two complementary devices combining jet-cooled environments and absorption spectroscopy: the Jet-AILES and the SPIRALES setups. Based on Q-branch frequency positions measured in the Jet-AILES Fourier-transform infrared (FTIR) spectra and guided by quantum chemistry calculations, we propose an extended vibrational and conformational analysis of the different MP isomers in their fingerprint region. Some modes such as far-IR out-of-plane -OH bending or mid-IR in-plane -CH bending allow us to assign individually all the stable conformers. Finally, using the SPIRALES setup with three different external cavity quantum cascade laser sources centered on the 930-990 cm-1 and the 1580-1690 cm-1 ranges, it was possible to proceed to the rovibrational analysis of the ν18 ring in-plane bending mode of the MP meta isomer providing a set of reliable excited state parameters, which confirms the correct assignment of two conformers. Interestingly, the observation of broad Q-branches without visible P- and R-branches in the region of the C-C ring stretching bands was interpreted as being probably due to a vibrational perturbation. These results highlight the complementarity of broadband FTIR and narrowband laser spectroscopic techniques to reveal the vibrational conformational signatures of atmospheric compounds over a large infrared spectral range.
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Affiliation(s)
- P Asselin
- Laboratoire MONARIS, UMR-CNRS 8233, Sciences Sorbonne Université, Paris, France and Université Pierre et Marie Curie, 75252 Paris, France
| | - J Bruckhuisen
- Laboratoire MONARIS, UMR-CNRS 8233, Sciences Sorbonne Université, Paris, France and Université Pierre et Marie Curie, 75252 Paris, France
| | - A Roucou
- Laboratoire de Physico-Chimie de l'Atmosphère, EA-4493, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
| | - M Goubet
- Université de Lille, CNRS, UMR8523 PhLAM Physique des Lasers Atomes et Molécules, F-59000 Lille, France
| | - M-A Martin-Drumel
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - A Jabri
- Laboratoire MONARIS, UMR-CNRS 8233, Sciences Sorbonne Université, Paris, France and Université Pierre et Marie Curie, 75252 Paris, France
| | - Y Belkhodja
- Laboratoire MONARIS, UMR-CNRS 8233, Sciences Sorbonne Université, Paris, France and Université Pierre et Marie Curie, 75252 Paris, France
| | - P Soulard
- Laboratoire MONARIS, UMR-CNRS 8233, Sciences Sorbonne Université, Paris, France and Université Pierre et Marie Curie, 75252 Paris, France
| | - R Georges
- Université de Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France
| | - A Cuisset
- Laboratoire de Physico-Chimie de l'Atmosphère, EA-4493, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
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Hakiri R, Derbel N, Stahl W, Mouhib H. Large Amplitude Motions in Fruit Flavors: The Case of Alkyl Butyrates. Chemphyschem 2019; 21:20-25. [DOI: 10.1002/cphc.201900727] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 09/03/2019] [Indexed: 11/08/2022]
Affiliation(s)
- Rihab Hakiri
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Département de Physique, Faculté des Sciences de Tunis –University of Tunis El Manar 2092 Manar II, Tunis Tunisia
- Université Paris-Est Marne-la-ValléeLaboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes 77454 Marne-la-Vallée France
| | - Najoua Derbel
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Département de Physique, Faculté des Sciences de Tunis –University of Tunis El Manar 2092 Manar II, Tunis Tunisia
| | - Wolfgang Stahl
- RWTH Aachen University Landoltweg 2 52056 Aachen Germany
| | - Halima Mouhib
- Université Paris-Est Marne-la-ValléeLaboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes 77454 Marne-la-Vallée France
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