1
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Roque JPL, Nunes CM, Viegas LP, Pereira NAM, Pinho E Melo TMVD, Schreiner PR, Fausto R. Switching on H-Tunneling through Conformational Control. J Am Chem Soc 2021; 143:8266-8271. [PMID: 34048232 DOI: 10.1021/jacs.1c04329] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
H-tunneling is a ubiquitous phenomenon, relevant to fields from biochemistry to materials science, but harnessing it for mastering the manipulation of chemical structures still remains nearly illusory. Here, we demonstrate how to switch on H-tunneling by conformational control using external radiation. This is outlined with a triplet 2-hydroxyphenylnitrene generated in an N2 matrix at 10 K by UV-irradiation of an azide precursor. The anti-orientation of the nitrene's OH moiety was converted to syn by selective vibrational excitation at the 2ν(OH) frequency, thereby moving the H atom closer to the vicinal nitrene center. This triggers spontaneous H-tunneling to a singlet 6-imino-2,4-cyclohexadienone. Computations reveal that such fast H-tunneling occurs through crossing the triplet-to-singlet potential energy surfaces. Our experimental realization provides an exciting novel strategy to attain control over tunneling, opening new avenues for directing chemical transformations.
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Affiliation(s)
- José P L Roque
- University of Coimbra, CQC, Department of Chemistry, 3004-535 Coimbra, Portugal
| | - Cláudio M Nunes
- University of Coimbra, CQC, Department of Chemistry, 3004-535 Coimbra, Portugal
| | - Luís P Viegas
- University of Coimbra, CQC, Department of Chemistry, 3004-535 Coimbra, Portugal
| | - Nelson A M Pereira
- University of Coimbra, CQC, Department of Chemistry, 3004-535 Coimbra, Portugal
| | | | - Peter R Schreiner
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
| | - Rui Fausto
- University of Coimbra, CQC, Department of Chemistry, 3004-535 Coimbra, Portugal
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2
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Nunes CM, Reva I, Fausto R. Conformational isomerizations triggered by vibrational excitation of second stretching overtones. Phys Chem Chem Phys 2019; 21:24993-25001. [PMID: 31710324 DOI: 10.1039/c9cp05070a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Vibrational excitation using frequency-tunable IR laser light has been developed as a powerful tool for selective manipulation of molecular conformations. In this methodology, vibrational excitation has been typically applied to the first stretching overtones (∼80 kJ mol-1) but also to the fundamental modes (∼40 kJ mol-1). Here, we demonstrate that selective conformational isomerizations are also achieved using excitation to second stretching overtones (∼120 kJ mol-1). The extremely weak absorptions of the second stretching overtones of molecules isolated in low-temperature matrices were measured for the first time; here using three prototype molecules: hydroxyacetone (HA), glycolic acid (GAc) and glycolamide (GAm). Benchmarking of computed anharmonic IR spectra showed that the B3LYP/SNSD method provides the best agreement with experimental frequencies of the ν(OH), 2ν(OH) and 3ν(OH) modes for the studied molecules in argon matrices. Selective irradiation at the 3ν(OH) frequencies (9850-10 500 cm-1) of HA, GAc and GAm monomers in argon matrices at 15 K successfully triggers their conformational isomerization. These results open the door to extend control over conformations separated by higher barriers and to induce other transformations not energetically accessible by excitation to the fundamental or first stretching overtone modes.
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Affiliation(s)
- Cláudio M Nunes
- CQC, Department of Chemistry, University of Coimbra, 3004-535, Coimbra, Portugal.
| | - Igor Reva
- CQC, Department of Chemistry, University of Coimbra, 3004-535, Coimbra, Portugal.
| | - Rui Fausto
- CQC, Department of Chemistry, University of Coimbra, 3004-535, Coimbra, Portugal.
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3
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Góbi S, Nunes CM, Reva I, Tarczay G, Fausto R. S–H rotamerizationviatunneling in a thiol form of thioacetamide. Phys Chem Chem Phys 2019; 21:17063-17071. [DOI: 10.1039/c9cp03417j] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rotamerization of the S–H groupviahydrogen tunneling is reported for the first time.
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Affiliation(s)
- Sándor Góbi
- CQC
- Department of Chemistry
- University of Coimbra
- Coimbra
- Portugal
| | | | - Igor Reva
- CQC
- Department of Chemistry
- University of Coimbra
- Coimbra
- Portugal
| | - György Tarczay
- Laboratory of Molecular Spectroscopy
- Institute of Chemistry
- ELTE Eötvös Loránd University
- H-1518 Budapest
- Hungary
| | - Rui Fausto
- CQC
- Department of Chemistry
- University of Coimbra
- Coimbra
- Portugal
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4
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Góbi S, Reva I, Csonka IP, M. Nunes C, Tarczay G, Fausto R. Selective conformational control by excitation of NH imino vibrational antennas. Phys Chem Chem Phys 2019; 21:24935-24949. [DOI: 10.1039/c9cp05370k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We provide experimental evidence for the occurrence of selective and reversible conformational control over the SH group by vibrational excitation of remote NH groups. Using an imino group that acts as a molecular antenna has no precedents.
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Affiliation(s)
- Sándor Góbi
- CQC
- Department of Chemistry
- University of Coimbra
- Coimbra
- Portugal
| | - Igor Reva
- CQC
- Department of Chemistry
- University of Coimbra
- Coimbra
- Portugal
| | - István Pál Csonka
- MTA-ELTE Lendület Laboratory Astrochemistry Research Group
- Institute of Chemistry
- ELTE Eötvös Loránd University
- H–1518 Budapest
- Hungary
| | | | - György Tarczay
- MTA-ELTE Lendület Laboratory Astrochemistry Research Group
- Institute of Chemistry
- ELTE Eötvös Loránd University
- H–1518 Budapest
- Hungary
| | - Rui Fausto
- CQC
- Department of Chemistry
- University of Coimbra
- Coimbra
- Portugal
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5
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Schreiner PR. Tunneling Control of Chemical Reactions: The Third Reactivity Paradigm. J Am Chem Soc 2017; 139:15276-15283. [DOI: 10.1021/jacs.7b06035] [Citation(s) in RCA: 116] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Peter R. Schreiner
- Institute of Organic Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
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6
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Ryazantsev SV, Feldman VI, Khriachtchev L. Conformational Switching of HOCO Radical: Selective Vibrational Excitation and Hydrogen-Atom Tunneling. J Am Chem Soc 2017. [DOI: 10.1021/jacs.7b02605] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sergey V. Ryazantsev
- Department
of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki FIN-00014, Finland
| | - Vladimir I. Feldman
- Department
of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Leonid Khriachtchev
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki FIN-00014, Finland
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7
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Kovács B, Kuş N, Tarczay G, Fausto R. Experimental Evidence of Long-Range Intramolecular Vibrational Energy Redistribution through Eight Covalent Bonds: NIR Irradiation Induced Conformational Transformation of E-Glutaconic Acid. J Phys Chem A 2017; 121:3392-3400. [PMID: 28423274 DOI: 10.1021/acs.jpca.7b00615] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Long-range intramolecular vibrational energy redistribution (IVR) driven conformational changes were investigated in a matrix-isolated open-chain, asymmetrical dicarboxylic acid, E-glutaconic acid. Although the analysis was challenging due to the presence of multiple backbone conformers and short lifetimes of the prepared higher energy cis conformers, it was shown that the selective excitation of the O-H stretching overtone of one of the carboxylic groups can induce the conformational change (trans to cis) of the other carboxylic group, located at the other end of the E-glutaconic acid molecule. This is a direct proof that the IVR process can act through eight covalent bonds in a flexible molecule before the excess energy completely dissipates into the matrix. The lifetime of the prepared higher energy conformers (averaged over the different backbones) was measured to be 12 s.
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Affiliation(s)
- Benjámin Kovács
- Institute of Chemistry, Eötvös University , PO Box 32, H-1518 Budapest 112, Hungary
| | - Nihal Kuş
- CQC, Department of Chemistry, University of Coimbra , 3004-535 Coimbra, Portugal.,Department of Physics, Anadolu University , TR-26470 Eskişehir, Turkey
| | - György Tarczay
- Institute of Chemistry, Eötvös University , PO Box 32, H-1518 Budapest 112, Hungary
| | - Rui Fausto
- CQC, Department of Chemistry, University of Coimbra , 3004-535 Coimbra, Portugal
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8
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Tew DP, Mizukami W. Ab Initio Vibrational Spectroscopy of cis- and trans-Formic Acid from a Global Potential Energy Surface. J Phys Chem A 2016; 120:9815-9828. [DOI: 10.1021/acs.jpca.6b09952] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- David P. Tew
- School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K
| | - Wataru Mizukami
- School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K
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9
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Schreiner PR, Wagner JP, Reisenauer HP, Gerbig D, Ley D, Sarka J, Császár AG, Vaughn A, Allen WD. Domino Tunneling. J Am Chem Soc 2015; 137:7828-34. [DOI: 10.1021/jacs.5b03322] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Peter R. Schreiner
- Institute
of Organic Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany
| | - J. Philipp Wagner
- Institute
of Organic Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany
| | - Hans Peter Reisenauer
- Institute
of Organic Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany
| | - Dennis Gerbig
- Institute
of Organic Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany
| | - David Ley
- Institute
of Organic Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany
| | - János Sarka
- Laboratory
of Molecular Structure and Dynamics, Institute of Chemistry, Eötvös University, PO Box 32, Budapest 112, Hungary, H-1518
- MTA-ELTE
Complex Chemical Systems Research Group, Eötvös University, Budapest, Pázmány Péter
Sétány 1/A, Hungary, H-1117
| | - Attila G. Császár
- Laboratory
of Molecular Structure and Dynamics, Institute of Chemistry, Eötvös University, PO Box 32, Budapest 112, Hungary, H-1518
- MTA-ELTE
Complex Chemical Systems Research Group, Eötvös University, Budapest, Pázmány Péter
Sétány 1/A, Hungary, H-1117
| | - Alexander Vaughn
- Center
for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Wesley D. Allen
- Center
for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, United States
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10
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UV-light induced conformational changes of 2-pyridinecarboxylic acid in low-temperature argon matrices. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2015.01.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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11
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Khriachtchev L. Matrix-isolation studies of noncovalent interactions: more sophisticated approaches. J Phys Chem A 2015; 119:2735-46. [PMID: 25679775 DOI: 10.1021/jp512005h] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Noncovalent interactions are crucial for many physical, chemical, and biological phenomena. Matrix isolation is a powerful method to study noncovalent interactions, including hydrogen-bonded species, and it has been extensively used in this field. However, there are difficult situations, such as in the case of species that are impossible to prepare in the gas phase. In this article, we describe some advanced approaches allowing studies of complexes that are problematic for the traditional methods. Photolysis of a suitable precursor in a matrix can lead to a large concentration of 1:1 complexes, which are otherwise very difficult to prepare (e.g., the H2O···O complex). Photolysis of species combined with annealing can lead to complexes of molecules with mobile atoms (e.g., the same H2O···O complex). Simultaneous photolysis of two species combined with annealing can produce complexes of radicals via reactions of the photogenerated complexes with mobile atoms (e.g., the H2O···HCO complex). Interaction of noble-gas (Ng) hydrides with other species is another topic (e.g., the N2···HArF complex) and very large blue shifts of the H-Ng stretching modes are normally observed for these systems. Complexes and dimers of the higher-energy conformer of formic acid have been prepared by using selective vibrational excitation of the ground-state conformer. The higher-energy conformer of formic acid can be efficiently stabilized in the complexes with strong hydrogen bonding. We also consider some problematic cases when the changes in the vibrational frequencies of the 1:1 complexes are very small (e.g., the phenol···Xe complex) and when the complex formation is prevented by strong solvation in the matrix (e.g., species in solid xenon).
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Affiliation(s)
- Leonid Khriachtchev
- Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
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12
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Kuş N, Fausto R. Near-infrared and ultraviolet induced isomerization of crotonic acid in N2 and Xe cryomatrices: First observation of two high-energy trans C–O conformers and mechanistic insights. J Chem Phys 2014; 141:234310. [DOI: 10.1063/1.4903841] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Nihal Kuş
- CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
- Department of Physics, Anadolu University, 26470 Eskişehir, Turkey
| | - Rui Fausto
- CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
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13
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Reva I, M Nunes C, Biczysko M, Fausto R. Conformational switching in pyruvic acid isolated in Ar and N₂ matrixes: spectroscopic analysis, anharmonic simulation, and tunneling. J Phys Chem A 2014; 119:2614-27. [PMID: 25332047 DOI: 10.1021/jp509578c] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Monomers of pyruvic acid (PA) isolated in cryogenic argon and nitrogen matrixes were characterized by mid- and near-infrared spectroscopy. Interpretation of the experiments was aided by fully anharmonic calculations of the fundamental modes, overtones, and combinations up to two quanta, including their infrared intensities. The initially dominating PA conformer (Tc) has a cis CCOH arrangement and is stabilized by a strong intramolecular H-bond. Selective near-infrared excitation of Tc at the first OH overtone (6630 cm(-1) in Ar, 6643 cm(-1) in N2) induced a large scale conformational conversion to the higher-energy conformer (Tt) with trans CCOH arrangement. Tt was then converted back to Tc by selective NIR irradiation at the first Tt OH overtone (6940 cm(-1) in Ar, 6894 cm(-1) in N2). In N2 matrix, the Tt form was stabilized due to interaction between the OH group and the matrix molecules. This stabilization manifested itself in the absence of Tt → Tc relaxation and in a considerable change of the vibrational Tt signature upon going from argon to nitrogen matrix. In argon, the Tt form spontaneously decayed back to Tc in the dark (characteristic lifetime +16 h). In the presence of broad-band near-infrared light, the Tt → Tc relaxation speed considerably increased. The decay mechanisms are discussed.
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Affiliation(s)
- Igor Reva
- †CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Cláudio M Nunes
- †CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Malgorzata Biczysko
- ‡Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy.,§Consiglio Nazionale delle Ricerche, Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR), UOS di Pisa, Area della Ricerca CNR, Via G. Moruzzi 1, I-56124 Pisa, Italy
| | - Rui Fausto
- †CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
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14
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Gerbig D, Schreiner PR. Hydrogen-Tunneling in Biologically Relevant Small Molecules: The Rotamerizations of α-Ketocarboxylic Acids. J Phys Chem B 2014; 119:693-703. [DOI: 10.1021/jp503633m] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Dennis Gerbig
- Institute of Organic Chemistry, Justus-Liebig-University, Heinrich-Buff-Ring 58, 35392 Giessen, Germany
| | - Peter R. Schreiner
- Institute of Organic Chemistry, Justus-Liebig-University, Heinrich-Buff-Ring 58, 35392 Giessen, Germany
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15
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Bazsó G, Magyarfalvi G, Tarczay G. Tunneling Lifetime of the ttc/VIp Conformer of Glycine in Low-Temperature Matrices. J Phys Chem A 2012; 116:10539-47. [DOI: 10.1021/jp3076436] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gábor Bazsó
- Laboratory of Molecular
Spectroscopy, Institute of
Chemistry, Eötvös University, P.O. Box 32, H-1518, Budapest 112, Hungary
| | - Gábor Magyarfalvi
- Laboratory of Molecular
Spectroscopy, Institute of
Chemistry, Eötvös University, P.O. Box 32, H-1518, Budapest 112, Hungary
| | - György Tarczay
- Laboratory of Molecular
Spectroscopy, Institute of
Chemistry, Eötvös University, P.O. Box 32, H-1518, Budapest 112, Hungary
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16
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Cao Q, Melavuori M, Lundell J, Räsänen M, Khriachtchev L. Matrix-isolation and ab initio study of the complex between formic acid and xenon. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.05.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Bazsó G, Góbi S, Tarczay G. Near-Infrared Radiation Induced Conformational Change and Hydrogen Atom Tunneling of 2-Chloropropionic Acid in Low-Temperature Ar Matrix. J Phys Chem A 2012; 116:4823-32. [DOI: 10.1021/jp212597y] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gábor Bazsó
- Laboratory of Molecular
Spectroscopy, Institute of
Chemistry, Eötvös University, PO Box 32, H-1518, Budapest 112, Hungary
| | - Sándor Góbi
- Laboratory of Molecular
Spectroscopy, Institute of
Chemistry, Eötvös University, PO Box 32, H-1518, Budapest 112, Hungary
| | - György Tarczay
- Laboratory of Molecular
Spectroscopy, Institute of
Chemistry, Eötvös University, PO Box 32, H-1518, Budapest 112, Hungary
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18
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Kuş N, Sharma A, Reva I, Lapinski L, Fausto R. Using heavy atom rare gas matrix to control the reactivity of 4-methoxybenzaldehyde: A comparison with benzaldehyde. J Chem Phys 2012; 136:144509. [DOI: 10.1063/1.3701734] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Marushkevich K, Khriachtchev L, Räsänen M, Melavuori M, Lundell J. Dimers of the Higher-Energy Conformer of Formic Acid: Experimental Observation. J Phys Chem A 2012; 116:2101-8. [DOI: 10.1021/jp209714e] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Leonid Khriachtchev
- Department of Chemistry, University of Helsinki, P.O. Box 55,
FIN-00014 Finland
| | - Markku Räsänen
- Department of Chemistry, University of Helsinki, P.O. Box 55,
FIN-00014 Finland
| | - Mia Melavuori
- Department of Chemistry, University of Helsinki, P.O. Box 55,
FIN-00014 Finland
| | - Jan Lundell
- Department of Chemistry, University of Jyväskylä, PL 35, FIN-40014 Finland
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20
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Maçôas EMS, Khriachtchev L, Pettersson M, Fausto R, Räsänen M. Rotational isomerization of small carboxylic acids isolated in argon matrices: tunnelling and quantum yields for the photoinduced processes. Phys Chem Chem Phys 2009; 7:743-9. [PMID: 19791357 DOI: 10.1039/b416641h] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The quantum yields for internal rotation around the C-O bond induced by excitation of the first overtone of the hydroxyl stretching mode in formic, acetic, and propionic acids isolated in solid Ar are comparatively discussed. The tunnelling kinetics for isomerization from the higher energy arrangement of the carboxylic group (cis) to the lower energy arrangement (trans) in this series of compounds is also analysed. Finally, the quantum yield for the C(alpha)-C isomerization in propionic acid was investigated and, in contrast with the C-O isomerization, shown to be probably sensitive to the local matrix morphology.
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Affiliation(s)
- Ermelinda M S Maçôas
- Laboratory of Physical Chemistry, University of Helsinki, PO Box 55, FIN-00014 Helsinki, Finland
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21
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Domanskaya A, Marushkevich K, Khriachtchev L, Räsänen M. Spectroscopic study ofcis-to-transtunneling reaction of HCOOD in rare gas matrices. J Chem Phys 2009; 130:154509. [DOI: 10.1063/1.3115642] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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22
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Maçôas EMS, Myllyperkiö P, Kunttu H, Pettersson M. Vibrational Relaxation of Matrix-Isolated Carboxylic Acid Dimers and Monomers. J Phys Chem A 2009; 113:7227-34. [DOI: 10.1021/jp8099384] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Ermelinda M. S. Maçôas
- Nanoscience Center, Department of Chemistry, P.O. Box 35, University of Jyväskylä, FI-40014 Finland
| | - Pasi Myllyperkiö
- Nanoscience Center, Department of Chemistry, P.O. Box 35, University of Jyväskylä, FI-40014 Finland
| | - Henrik Kunttu
- Nanoscience Center, Department of Chemistry, P.O. Box 35, University of Jyväskylä, FI-40014 Finland
| | - Mika Pettersson
- Nanoscience Center, Department of Chemistry, P.O. Box 35, University of Jyväskylä, FI-40014 Finland
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23
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Lignell A, Khriachtchev L. Intermolecular interactions involving noble-gas hydrides: Where the blue shift of vibrational frequency is a normal effect. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2008.07.010] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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24
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Olbert-Majkut A, Ahokas J, Lundell J, Pettersson M. Investigating isomerization reactions in solid state by using simultaneous high overtone pumping and Raman detection. J Chem Phys 2008; 129:041101. [DOI: 10.1063/1.2955985] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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25
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Sharma A, Reva I, Fausto R. Matrix-Isolation Study and Ab Initio Calculations of the Structure and Spectra of Hydroxyacetone. J Phys Chem A 2008; 112:5935-46. [DOI: 10.1021/jp8012909] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Archna Sharma
- Department of Chemistry, University of Coimbra, P-3004-535 Coimbra, Portugal
| | - Igor Reva
- Department of Chemistry, University of Coimbra, P-3004-535 Coimbra, Portugal
| | - Rui Fausto
- Department of Chemistry, University of Coimbra, P-3004-535 Coimbra, Portugal
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The role of intermolecular vibrations and reorganization of a reaction system in tunneling reactions with H atom transfer. A Debye model for the medium. Russ Chem Bull 2008. [DOI: 10.1007/s11172-008-0138-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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27
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Khriachtchev L. Rotational isomers of small molecules in noble-gas solids: From monomers to hydrogen-bonded complexes. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2007.10.011] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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28
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Olbert-Majkut A, Reva ID, Fausto R. Selective IR-induced isomerization of 1,2-dichloropropane isolated in xenon matrix. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.03.032] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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29
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Marushkevich K, Khriachtchev L, Räsänen M. High-energy conformer of formic acid in solid neon: Giant difference between the proton tunneling rates ofcismonomer andtrans-cisdimer. J Chem Phys 2007; 126:241102. [PMID: 17614528 DOI: 10.1063/1.2752152] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
We study the conformational reorganization of formic acid (FA) in solid neon and report the higher-energy cis-FA monomer and one form of the trans-cis FA dimers. They were prepared by selective vibrational excitation of the trans-FA monomer and trans-trans dimer. The proton tunneling decay of cis-FA monomer is surprisingly very fast in solid neon, two orders of magnitude faster than in solid argon. It was also found that the stability of the trans-cis dimer against proton tunneling is enormously enhanced in solid neon compared to the monomer (by a factor of approximately 300). These results are discussed in terms of matrix solvation and hydrogen bonding.
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Affiliation(s)
- Kseniya Marushkevich
- Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland
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Nishino S, Nakata M. Intramolecular hydrogen atom tunneling in 2-chlorobenzoic acid studied by low-temperature matrix-isolation infrared spectroscopy. J Phys Chem A 2007; 111:7041-7. [PMID: 17602541 DOI: 10.1021/jp0717600] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Intramolecular hydrogen atom tunneling in 2-chlorobenzoic acid has been investigated by low-temperature matrix-isolation infrared spectroscopy with the aid of density functional theory calculation. Infrared spectra of two relatively stable syn isomers, SC and ST, were observed in argon and xenon matrixes. When the matrix samples were annealed after deposition, the isomerization from ST to SC occurred around the benzene-carboxyl bond. Two less stable anti isomers, AT, which has an OH...Cl intramolecular hydrogen bond, and AC, which has no OH...Cl bond, were produced from SC and ST upon UV irradiation. When the matrix samples were kept in the dark after UV irradiation, AT and AC changed to ST and SC, respectively, by spontaneous isomerization around the C-O axis in the carboxyl group. The rate constants of isomerization, AT --> ST, in a Xe matrix were estimated from the absorbance changes at various matrix temperatures. The rate constants showed a drastic decrease in deuteration of the hydrogen atom of the carboxyl group. The relationship between the rate constants and the matrix temperature did not follow the Arrhenius law. These findings lead to the conclusion that the isomerization of AT --> ST and AC --> SC in low-temperature rare-gas matrixes proceeds through intramolecular hydrogen atom tunneling.
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Affiliation(s)
- Satoshi Nishino
- Graduate School of BASE (Bio-Applications and Systems Engineering), Tokyo University of Agriculture and Technology, Naka-cho, Koganei, Tokyo 184-8588, Japan
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31
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Nagaya M, Nakata M. Dynamics of Intramolecular Hydrogen-Atom Migrations in 2-Hydroxy-3-nitropyridine Studied by Low-Temperature Matrix-Isolation Infrared Spectroscopy and Density Functional Theory Calculation. J Phys Chem A 2007; 111:6256-62. [PMID: 17591760 DOI: 10.1021/jp0726687] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Intramolecular hydrogen-atom migrations in 2-hydroxy-3-nitropyridine have been investigated by low-temperature matrix-isolation infrared (IR) spectroscopy with the aid of density functional theory (DFT) calculation. An IR spectrum measured after deposition was assigned to an enol isomer, the conformation of which is anti in relation to OH versus N in the pyridine ring. When the matrix sample was exposed to UV and visible light (lambda>350 nm), an IR spectrum consistent with a keto product was observed. During the irradiation, an IR spectrum of a transient species, a photoreaction intermediate between anti-enol and keto, was observed, which was assigned to syn-enol. The bands of syn-enol disappeared completely when the irradiation was stopped, while those of the original isomer, anti-enol, reappeared. No reverse isomerization was observable in the corresponding deuterated species. This led to the conclusion that the isomerization from syn to anti occurs through hydrogen-atom tunneling. On the other hand, an aci-nitro form was produced by UV irradiation (lambda=365+/-10 nm) without visible light. The conformation around the aci-nitro group was determined to be cis-cis by comparison with the spectral patterns obtained by the DFT/B3LYP/6-31++G** calculation. The dynamics of the hydrogen-atom migrations between anti- and syn-enols, syn-enol and keto, and anti-enol and aci-nitro are discussed in terms of the potential surfaces obtained by the DFT calculation.
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Affiliation(s)
- Maki Nagaya
- Graduate School of BASE (Bio-Applications and Systems Engineering), Tokyo University of Agriculture and Technology, Naka-cho, Koganei, Tokyo 184-8588, Japan
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Marushkevich K, Khriachtchev L, Räsänen M. High-energy conformer of formic acid in solid hydrogen: conformational change promoted by host excitation. Phys Chem Chem Phys 2007; 9:5748-51. [DOI: 10.1039/b712647f] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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34
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Isoniemi E, Khriachtchev L, Makkonen M, Räsänen M. UV Photolysis Products of Propiolic Acid in Noble-Gas Solids. J Phys Chem A 2006; 110:11479-87. [PMID: 17020260 DOI: 10.1021/jp062080k] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Photolysis (193 nm) of propiolic acid (HCCCOOH) was studied with Fourier transform infrared spectroscopy in noble-gas (Ar, Kr, and Xe) solid matrixes. The photolysis products were assigned using ab initio quantum chemistry calculations. The novel higher-energy conformer of propiolic acid was efficiently formed upon UV irradiation, and it decayed back to the ground-state conformer on a time scale of approximately 10 min by tunneling of the hydrogen atom through the torsional energy barrier. In addition, the photolysis produced a number of matrix-isolated 1:1 molecular complexes such as HCCH...CO2, HCCOH...CO, and H2O...C3O. The HCCH...CO2 complex dominated among the photolysis products, and the computations suggested a parallel geometry of this complex characterized by an interaction energy of -9.6 kJ/mol. The HCCOH...CO complex also formed efficiently, but its concentration was strongly limited by its light-induced decomposition. In this complex, the most probable geometry was found to feature the interaction of carbon monoxide with the OH group via the carbon atom, and the computational interaction energy was determined to be -18.3 kJ/mol. The formation of the strong H2O...C3O complex (interaction energy -21 kJ/mol) was less efficient, which might be due to the inefficiency of the involved radical reaction.
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Affiliation(s)
- Esa Isoniemi
- Laboratory of Physical Chemistry, P.O. Box 5, University of Helsinki, Helsinki FIN-00014, Finland
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Khriachtchev L, Tanskanen H, Räsänen M. Selective and reversible control of a chemical reaction with narrow-band infrared radiation: HXeCC radical in solid xenon. J Chem Phys 2006; 124:181101. [PMID: 16709089 DOI: 10.1063/1.2201445] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The light-induced H + XeC2 <--> HXeCC reaction is studied in solid Xe, and the full optical control of this reaction is demonstrated. By narrow-band excitation in the IR spectral region, HXeCC radicals can be decomposed to a local metastable configuration and then selectively recovered by resonant excitation of the XeC2 vibrations. The novel recovery process is explained by short-range mobility of the reagents promoted by vibrational energy redistribution near the absorbing XeC2 molecule. This means that a chemical reaction can be selectively promoted in a desired place where the chosen absorber locates. The obtained results make a strong case of solid-state reactive vibrational excitation spectroscopy of weak radiationless transitions.
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Affiliation(s)
- Leonid Khriachtchev
- Laboratory of Physical Chemistry, University of Helsinki, P. O. Box 55, FIN-00014, Helsinki, Finland.
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Maçôas EMS, Khriachtchev L, Pettersson M, Fausto R, Räsänen M. Internal Rotation in Propionic Acid: Near-Infrared-Induced Isomerization in Solid Argon. J Phys Chem A 2005; 109:3617-25. [PMID: 16839027 DOI: 10.1021/jp044070u] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The conformational system of propionic acid (CH3CH2COOH) is studied in solid argon. It is predicted by the ab initio calculations that this molecule has four stable conformers. These four structures are denoted Tt, Tg+/-, Ct, and Cg+/-, and they differ by the arrangement around the C-O and Calpha-C bonds. The ground-state Tt conformer is the only form present at 8 K after deposition of an argon matrix containing propionic acid. For the CH3CH2COOH and CH3CH2COOD isotopologues, narrow-band excitation of the first hydroxyl stretching overtone of the conformational ground state promotes the Calpha-C and C-O internal rotations producing the Tg+/- and Ct conformers, respectively. A subsequent vibrational excitation of the produced Tg+/- form induces its conversion to the Cg+/- conformer by rotation around the C-O bond. In the dark, all of the produced conformers decay to the conformational ground state at different rates. The decay kinetics and its temperature dependence allow the identification of the conformers by IR absorption spectroscopy, which is supported by ab initio calculations of their vibrational spectra. For the CH3CH2COOD isotopologue, the excitation of molecules isolated in different matrix sites results in site-dependent photoisomerization rates for the Calpha-C and C-O internal rotations, which also confirm the identification of the photoproducts.
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Affiliation(s)
- Ermelinda M S Maçôas
- Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland.
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Hydrogen-atom migration and Wolff rearrangement in photolysis of chlorohydroquinone to produce p-benzoquinone and 3-hydroxy-2,4-cyclopentadiene-1-ylidenemethanone. J Photochem Photobiol A Chem 2005. [DOI: 10.1016/j.jphotochem.2004.05.033] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Khriachtchev L, Lignell A, Juselius J, Räsänen M, Savchenko E. Infrared absorption spectrum of matrix-isolated noble-gas hydride molecules: Fingerprints of specific interactions and hindered rotation. J Chem Phys 2005; 122:14510. [PMID: 15638677 DOI: 10.1063/1.1827592] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Noble-gas hydride molecules with the general formula HNgY (Ng denotes noble-gas atom and Y denotes electronegative fragment) are usually prepared in solid noble gases. In many cases, the matrix-isolated HNgY molecules show a characteristic structure of the H-Ng stretching absorption: A close doublet as the main spectral feature and a weaker satellite at higher energy. This characteristic band structure is studied here for matrix-isolated HXeBr and HKrCl molecules. Based on the experimental and theoretical results, we suggest a model explaining the common features of the band structure of the HNgY molecules in noble-gas matrices. In this model, the main doublet bands are attributed to matrix sites where the splitting is caused by specific interactions of the embedded molecule with noble-gas matrix atoms in certain local morphology. The weaker blueshifted band is probably a fingerprint of hindered rotation (libration) of the embedded molecule in the lattice. This librational band has a mirror counterpart at lower energies appearing at higher matrix temperatures. Our present ab initio calculations for the one-to-one Xe...HXeBr complexes and the simulation of hindered rotation in a matrix support this image.
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Affiliation(s)
- Leonid Khriachtchev
- Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland.
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Macoas EMS, Khriachtchev L, Pettersson M, Fausto R, Rasanen M. Rotational isomerism of acetic acid isolated in rare-gas matrices: Effect of medium and isotopic substitution on IR-induced isomerization quantum yield and cis→trans tunneling rate. J Chem Phys 2004; 121:1331-8. [PMID: 15260676 DOI: 10.1063/1.1760733] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Rotational isomerization of acetic acid (CH3COOH) is studied in Ar, Kr, and Xe matrices. The light-induced trans-->cis reaction is promoted using resonant excitation of a number of modes in the 3500-7000 cm(-1) region, and the quantum yields for this process are measured for various acetic acid isotopologues and matrix materials. For excitation of acetic acid at energies above the predicted isomerization energy barrier (> or =4400 cm(-1)), the measured quantum yields are in average 2%-3%, and this is one order of magnitude smaller than the corresponding values known for formic acid (HCOOH). This difference is interpreted in terms of the presence of the methyl group in acetic acid, which enhances energy relaxation channels competing with the rotational isomerization. This picture is supported by the observed large effect of deuteration of the methyl group on the photoisomerization quantum yield. The trans-->cis reaction quantum yields are found to be similar for Ar, Kr, and Xe matrices, suggesting similar energy relaxation processes for this molecule in the various matrices. The IR-induced cis-->trans process, studied for acetic acid deuterated in the hydroxyl group, shows reliably larger quantum yields as compared with the trans-->cis process. For pumping of acetic acid at energies below the predicted isomerization barrier, the trans-->cis reaction quantum yields decrease strongly when the photon energy decreases, and tunneling is the most probable mechanism for this process. For the cis-->trans dark reaction, the observed temperature and medium effects indicate the participation of the lattice phonons in the tunneling-induced process.
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Affiliation(s)
- E M S Macoas
- Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland.
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