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Tama Saragi R, Li W, Juanes M, Enríquez L, Pinacho R, Rubio JE, Lesarri A. Rotational Spectroscopy and Conformational Flexibility of 2-Phenylethanethiol: The Dominant S-H⋅⋅⋅π Intramolecular Hydrogen Bond. Chemphyschem 2024; 25:e202300799. [PMID: 38282167 DOI: 10.1002/cphc.202300799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 01/19/2024] [Accepted: 01/23/2024] [Indexed: 01/30/2024]
Abstract
We present a rotational-computational investigation of the aromatic mercaptan 2-phenylethanethiol, addressing its potential energy surface, conformational equilibrium, internal dynamics and intramolecular interactions. The experiment used broadband chirped-pulse Fourier transform microwave spectroscopy in a supersonic jet expansion, recording the rotational spectrum in the 2-8 GHz frequency region. Two different conformers were detected in the spectrum. The most intense transitions correspond to a skew (gauche-gauche) conformation, identified as the global minimum. The spectra of ten different isotopologues were assigned for this species, leading to accurate effective and substitution structures. The weaker spectrum presents small tunnelling doublings caused by the torsional motion of the thiol group, which are only compatible with an antiperiplanar skeleton and a gauche thiol. The larger stability of the global minimum is attributed to an intramolecular S-H⋅⋅⋅π weak hydrogen bond. A comparison of the intramolecular interactions in the title molecule and 2-phenylethanol, similarly stabilized by a O-H⋅⋅⋅π hydrogen bond, shows the different strength of these interactions. Density functional (B3LYP-D3, B2PLYP-D3) and ab initio (MP2) calculations were conducted for the molecule.
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Affiliation(s)
- Rizalina Tama Saragi
- Departamento de Química Física y Química Inorgánica -, I.U. CINQUIMA, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén 7, 47011, Valladolid, Spain
- Present address: Institut für Ionenphysik und Angewandte Chemie, Universität Innsbruck, Technikerstr. 25/4. OG, 6020, Innsbruck, Austria
| | - Wenqin Li
- Departamento de Química Física y Química Inorgánica -, I.U. CINQUIMA, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén 7, 47011, Valladolid, Spain
| | - Marcos Juanes
- Departamento de Química Física y Química Inorgánica -, I.U. CINQUIMA, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén 7, 47011, Valladolid, Spain
| | - Lourdes Enríquez
- Departamento de Electrónica, ETSIT, Universidad de Valladolid, Paseo de Belén 11, 47011, Valladolid, Spain
| | - Ruth Pinacho
- Departamento de Electrónica, ETSIT, Universidad de Valladolid, Paseo de Belén 11, 47011, Valladolid, Spain
| | - José Emiliano Rubio
- Departamento de Electrónica, ETSIT, Universidad de Valladolid, Paseo de Belén 11, 47011, Valladolid, Spain
| | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica -, I.U. CINQUIMA, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén 7, 47011, Valladolid, Spain
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2
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Rahimi R, Saban N, Bar I. Synergistic Spectroscopic and Computational Characterization Evidencing the Preservation or Flipping of the Hydroxyl Group of 2-Phenylethyl Alcohol upon Single and Double Hydration. J Am Chem Soc 2023; 145:18455-18467. [PMID: 37561882 DOI: 10.1021/jacs.3c04762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
Even apparently simple, obtaining and analyzing observations on molecules and clusters and unambiguously assigning their structures is challenging. We report here the first ionization-loss Raman spectra compared to quantum chemical predictions for establishing the structural preferences of hydrates of the neurotransmitters hydroxy analogue, 2-phenylethyl alcohol (PEAL). The spectra encode two monohydrates and two previously unnoticed dihydrates, consequences of water insertion and sidewise attachment to the O-H group of gauche PEALs, in PEAL-H2O and PEAL-(H2O)2, or the higher-energy gauche-trans PEAL in the latter. The electronic structures retain the stable PEAL or flip its O-H to convert the gauche-trans PEAL conformer to the global minimum-energy dihydrate. We disclose conventional and bifurcated hydrogen bonds and electron steric repulsions by noncovalent interaction analysis and correlations between the experimental O-H stretching vibrational frequencies and the O-H and H···X bond lengths and electron densities, pointing to implications on hydrate forms and our approach virtue.
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Affiliation(s)
- Rami Rahimi
- Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Noga Saban
- Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Ilana Bar
- Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
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3
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Camiruaga A, Saragi RT, Torres-Hernández F, Juanes M, Usabiaga I, Lesarri A, Fernández JA. The evolution towards cyclic structures in the aggregation of aromatic alcohols: the dimer, trimer and tetramer of 2-phenylethanol. Phys Chem Chem Phys 2022; 24:24800-24809. [PMID: 36214363 DOI: 10.1039/d2cp03485a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Gas-phase spectroscopic studies of alcohol clusters offer accurate information on the influence of non-covalent interactions on molecular recognition, and are of paramount importance to model supramolecular and biological chemical processes. Here, we examine the role of the aliphatic side chain in the self-aggregation of aromatic alcohols, using a multi-methodological gas-phase approach which combines microwave spectroscopy and mass-resolved electronic and vibrational laser spectroscopy. Spectroscopic and electronic structure computations were carried out for the dimer, trimer and tetramer of 2-phenylethanol, extending previous investigations on smaller aromatic alcohols. While the conformational flexibility of the ethyl group anticipates a variety of torsional isomers, the intra- and inter-molecular interactions restrict molecular conformations and favour particularly stable isomers. The conformational landscape of the clusters is very shallow and multiple competing isomers were rotationally and/or vibrationally detected, including three dimer species, two trimers and two tetramers. Cluster growth is associated with a tendency to form cyclic hydrogen bond structures.
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Affiliation(s)
- Ander Camiruaga
- Dep. of Physical Chemistry, Fac. of Science and Technology, University of the Basque Country (UPV/EHU), Bo̲ Sarriena S/N, Leioa, 48940, Spain.
| | - Rizalina Tama Saragi
- Dep. of Physical Chemistry and Inorganic Chemistry, Fac. of Sciences - I.U. CINQUIMA, University of Valladolid, Paseo de Belén, 7, 47011, Valladolid, Spain
| | - Fernando Torres-Hernández
- Dep. of Physical Chemistry, Fac. of Science and Technology, University of the Basque Country (UPV/EHU), Bo̲ Sarriena S/N, Leioa, 48940, Spain.
| | - Marcos Juanes
- Dep. of Physical Chemistry and Inorganic Chemistry, Fac. of Sciences - I.U. CINQUIMA, University of Valladolid, Paseo de Belén, 7, 47011, Valladolid, Spain
| | - Imanol Usabiaga
- Dep. of Physical Chemistry, Fac. of Science and Technology, University of the Basque Country (UPV/EHU), Bo̲ Sarriena S/N, Leioa, 48940, Spain.
| | - Alberto Lesarri
- Dep. of Physical Chemistry and Inorganic Chemistry, Fac. of Sciences - I.U. CINQUIMA, University of Valladolid, Paseo de Belén, 7, 47011, Valladolid, Spain
| | - José A Fernández
- Dep. of Physical Chemistry, Fac. of Science and Technology, University of the Basque Country (UPV/EHU), Bo̲ Sarriena S/N, Leioa, 48940, Spain.
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4
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Becucci M, Melandri S. High-Resolution Spectroscopic Studies of Complexes Formed by Medium-Size Organic Molecules. Chem Rev 2016; 116:5014-37. [DOI: 10.1021/acs.chemrev.5b00512] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Maurizio Becucci
- Department
of Chemistry “Ugo Schiff” and European Laboratory for
Nonlinear Spectroscopy, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy
| | - Sonia Melandri
- Department
of Chemistry “Giacomo Ciamician”, University of Bologna, Via Francesco Selmi 2, 40126 Bologna, Italy
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Yu Y, Wang Y, Hu N, Lin K, Zhou X, Liu S. Cβ–H stretching vibration as a new probe for conformation of n-propanol in gaseous and liquid states. Phys Chem Chem Phys 2016; 18:10563-72. [DOI: 10.1039/c6cp00244g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The CH2 symmetric stretching mode at the β-carbon position can be used as a new probe for the five conformations of n-propanol.
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Affiliation(s)
- Yuanqin Yu
- School of Physics and Material Science
- Anhui University
- Hefei
- China
| | - Yuxi Wang
- Hefei National Laboratory for Physical Sciences at the Microscale
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Department of Chemical Physics
- University of Science and Technology of China
- Hefei 230026
| | - Naiyin Hu
- Hefei National Laboratory for Physical Sciences at the Microscale
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Department of Chemical Physics
- University of Science and Technology of China
- Hefei 230026
| | - Ke Lin
- Hefei National Laboratory for Physical Sciences at the Microscale
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Department of Chemical Physics
- University of Science and Technology of China
- Hefei 230026
| | - Xiaoguo Zhou
- Hefei National Laboratory for Physical Sciences at the Microscale
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Department of Chemical Physics
- University of Science and Technology of China
- Hefei 230026
| | - Shilin Liu
- Hefei National Laboratory for Physical Sciences at the Microscale
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Department of Chemical Physics
- University of Science and Technology of China
- Hefei 230026
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Wickrama Arachchilage AP, Feyer V, Plekan O, Iakhnenko M, Prince KC, Wang F. Valence structures of aromatic bioactive compounds: a combined theoretical and experimental study. JOURNAL OF SYNCHROTRON RADIATION 2012; 19:773-781. [PMID: 22898957 DOI: 10.1107/s0909049512026489] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Accepted: 06/11/2012] [Indexed: 06/01/2023]
Abstract
Valence electronic structures of three recently isolated aryl bioactive compounds, namely 2-phenylethanol (2PE), p-hydroxyphenylethanol (HPE) and 4-hydroxybenzaldehyde (HBA), are studied using a combined theoretical and experimental method. Density functional theory-based calculations indicate that the side chains cause electron charge redistribution and therefore influence the aromaticity of the benzene derivatives. The simulated IR spectra further reveal features induced by the side chains. Solvent effects on the IR spectra are simulated using the polarizable continuum model, which exhibits enhancement of the O-H stretch vibrations with significant red-shift of 464 cm(-1) in 2PE. A significant spectral peak splitting of 94 cm(-1) between O(4)-H and O(8)-H of HPE is revealed in an aqueous environment. Experimental measurements for valence binding energy spectra for 2PE, HPE and HBA are presented and analyzed using outer-valence Green function calculations. The experimental (predicted) first ionization energies are measured as 9.19 (8.79), 8.47 (8.27) and 8.97 (8.82) eV for 2PE, HPE and HBA, respectively. The frontier orbitals (highest occupied molecular orbitals, HOMOs, and lowest unoccupied molecular orbitals, LUMOs) have similar atomic orbital characters although the HOMO-LUMO energy gaps are quite different.
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Karaminkov R, Chervenkov S, Delchev V, Neusser HJ. High-Resolution Mass-Selective UV Spectroscopy of Pseudoephedrine: Evidence for Conformer-Specific Fragmentation. J Phys Chem A 2011; 115:9704-13. [DOI: 10.1021/jp201399s] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- R. Karaminkov
- Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany
| | - S. Chervenkov
- Max-Planck-Institut für Quantenoptik, Hans-Kopfermannstrasse 1, 85748 Garching, Germany
| | - V. Delchev
- Department of Physical Chemistry, University of Plovdiv, Tzar Assen Street 24, 4000 Plovdiv, Bulgaria
| | - H. J. Neusser
- Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany
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8
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Mayorkas N, Malka I, Bar I. Ionization-loss stimulated Raman spectroscopy for conformational probing of flexible molecules. Phys Chem Chem Phys 2011; 13:6808-15. [DOI: 10.1039/c0cp02334e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Karaminkov R, Chervenkov S, Neusser HJ. Water binding sites in 2-para- and 2-ortho-fluorophenylethanol: A high-resolution UV experiment and ab initio calculations. J Chem Phys 2010; 133:194301. [DOI: 10.1063/1.3497653] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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10
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Karaminkov R, Chervenkov S, Neusser HJ. Mass-Analyzed Threshold Ionization Spectroscopy of Ortho Fluorinated 2-Phenylethanol: Identification of an Additional Gauche Conformer. J Phys Chem A 2010; 114:11263-8. [DOI: 10.1021/jp103941d] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- R. Karaminkov
- Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstr. 4, 85748 Garching, Germany
| | - S. Chervenkov
- Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstr. 4, 85748 Garching, Germany
| | - H. J. Neusser
- Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstr. 4, 85748 Garching, Germany
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11
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Georgiev S, Karaminkov R, Chervenkov S, Delchev V, Neusser HJ. Mass-Analyzed Threshold Ionization Spectroscopy of 2-Phenylethanol: Probing of Conformational Changes Caused by Ionization. J Phys Chem A 2009; 113:12328-36. [DOI: 10.1021/jp908045k] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- S. Georgiev
- Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany
| | - R. Karaminkov
- Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany
| | - S. Chervenkov
- Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany
| | - V. Delchev
- Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany
| | - H. J. Neusser
- Physikalische und Theoretische Chemie, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany
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12
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Karaminkov R, Chervenkov S, Neusser HJ, Ramanathan V, Chakraborty T. Competition between π and σ hydrogen bonds and conformational probing of 2-orthofluorophenylethanol by low-and high-resolution electronic spectroscopy. J Chem Phys 2009; 130:034301. [DOI: 10.1063/1.3058483] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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13
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Karaminkov R, Chervenkov S, Neusser HJ. Mass analysed threshold ionisation spectroscopy of flexible 2-para-fluorophenylethanol conformers with and without an intramolecular OH⋯π bond. Phys Chem Chem Phys 2009; 11:2249-55. [DOI: 10.1039/b817519e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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14
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Karaminkov R, Chervenkov S, Neusser HJ. Fluorine substitution and nonconventional OH⋯π intramolecular bond: high-resolution UV spectroscopy and ab initio calculations of 2-(p-fluorophenyl)ethanol. Phys Chem Chem Phys 2008; 10:2852-9. [DOI: 10.1039/b718974e] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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