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Aroule O, Jarraya M, Zins EL, Hochlaf M. Probing microhydration-induced effects on carbonyl compounds. Phys Chem Chem Phys 2024; 26:22230-22239. [PMID: 39129488 DOI: 10.1039/d4cp01035c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/13/2024]
Abstract
Characterizing the microhydration of organic molecules is a crucial step in understanding many phenomena relevant to atmospheric, biological, and industrial applications. However, its precise experimental and theoretical description remains a challenge. For four organic solutes containing a CO bond, and included in the recent HyDRA challenge [T. L. Fischer, M. Bödecker, A. Zehnacker-Rentien, R. A. Mata and M. A. Suhm, Phys. Chem. Chem. Phys., 2022, 24, 11442-11454.], we performed a detailed study of different monohydrate isomers and their properties; these were cyclooctanone (CON), 1,3-dimethyl-2-imidazolidinon (DMI), methyl lactate (MLA), and 2,2,2-trifluoroacetophenone (TPH) molecules. As reported in the literature, the O-H elongation shift of the water molecule appears to be a good candidate for characterizing complexation-induced effects. We also show that CO elongation shift and UV-vis spectroscopy can be successfully used for these purposes. Besides, we present a comparative analysis of the strengths of non-covalent interactions within these monohydrated complexes based on interpretative tools of quantum chemistry, including topological analysis of electron density (ρ), topological analysis of electron pairing function, and analysis of the core-valence bifurcation index (CVBI), which exhibits a close linear dependency on ρ. Accordingly, a classification of intermolecular water-solute interactions is proposed.
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Affiliation(s)
- Olivier Aroule
- MONARIS UMR 8233 CNRS, Sorbonne Université, 4 place Jussieu, 75252 Paris Cedex 5, France.
| | - Mahmoud Jarraya
- Université Gustave Eiffel, COSYS/IMSE, 5 Bd Descartes 77454, Champs sur Marne, France.
| | - Emilie-Laure Zins
- MONARIS UMR 8233 CNRS, Sorbonne Université, 4 place Jussieu, 75252 Paris Cedex 5, France.
| | - Majdi Hochlaf
- Université Gustave Eiffel, COSYS/IMSE, 5 Bd Descartes 77454, Champs sur Marne, France.
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2
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Golec B, Sałdyka M, Mielke Z. Photo-Induced Reactions between Glyoxal and Hydroxylamine in Cryogenic Matrices. Molecules 2022; 27:molecules27154797. [PMID: 35956748 PMCID: PMC9369962 DOI: 10.3390/molecules27154797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 07/21/2022] [Accepted: 07/24/2022] [Indexed: 11/16/2022] Open
Abstract
In this paper, the photochemistry of glyoxal−hydroxylamine (Gly−HA) complexes is studied using FTIR matrix isolation spectroscopy and ab initio calculations. The irradiation of the Gly−HA complexes with the filtered output of a mercury lamp (λ > 370 nm) leads to their photoconversion to hydroxyketene−hydroxylamine complexes and the formation of hydroxy(hydroxyamino)acetaldehyde with a hemiaminal structure. The first product is the result of a double hydrogen exchange reaction between the aldehyde group of Gly and the amino or hydroxyl group of HA. The second product is formed as a result of the addition of the nitrogen atom of HA to the carbon atom of one aldehyde group of Gly, followed by the migration of the hydrogen atom from the amino group of hydroxylamine to the oxygen atom of the carbonyl group of glyoxal. The identification of the products is confirmed by deuterium substitution and by MP2 calculations of the structures and vibrational spectra of the identified species.
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Affiliation(s)
- Barbara Golec
- Institute of Physical Chemistry, Polish Academy of Sciences, 01-224 Warsaw, Poland
- Correspondence: (B.G.); (M.S.); Tel.: +48-22-343-3410 (B.G.)
| | - Magdalena Sałdyka
- Faculty of Chemistry, University of Wroclaw, 50-383 Wrocław, Poland;
- Correspondence: (B.G.); (M.S.); Tel.: +48-22-343-3410 (B.G.)
| | - Zofia Mielke
- Faculty of Chemistry, University of Wroclaw, 50-383 Wrocław, Poland;
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3
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Wan N, Jiang J, Wang H, Chen P, Fan H, Wang W, Hua L, Li H. Sensitive detection of glyoxal by cluster-mediated CH2Br2+ chemical ionization time-of-flight mass spectrometry. Anal Chim Acta 2022; 1206:339612. [DOI: 10.1016/j.aca.2022.339612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 01/05/2022] [Accepted: 02/14/2022] [Indexed: 11/01/2022]
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4
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Photoinduced double proton transfer in the glyoxal-methanol complex along T1 reaction path – a quantum chemical topological study. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129426] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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5
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Complexes of Formaldehyde and α-Dicarbonyls with Hydroxylamine: FTIR Matrix Isolation and Theoretical Study. Molecules 2021; 26:molecules26041144. [PMID: 33672783 PMCID: PMC7924657 DOI: 10.3390/molecules26041144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 02/16/2021] [Accepted: 02/18/2021] [Indexed: 11/29/2022] Open
Abstract
The interactions of formaldehyde (FA), glyoxal (Gly) and methylglyoxal (MGly) with hydroxylamine (HA) isolated in solid argon and nitrogen were studied using FTIR spectroscopy and ab initio methods. The spectra analysis indicates the formation of two types of hydrogen-bonded complexes between carbonyl and hydroxylamine in the studied matrices. The cyclic planar complexes are stabilized by O–H⋯O(C), and C–H⋯N interactions and the nonplanar complexes are stabilized by O–H⋯O(C) bond. Formaldehyde was found to form with hydroxylamine, the cyclic planar complex and methylglyoxal, the nonplanar one in both argon and nitrogen matrices. In turn, glyoxal forms with hydroxylamine the most stable nonplanar complex in solid argon, whereas in solid nitrogen, both types of the complex are formed.
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6
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Photoinduced Double Proton Transfer in the Glyoxal-Methanol Complex Revisited: The Role of the Excited States. J Chem Theory Comput 2020; 16:3273-3286. [PMID: 32275423 DOI: 10.1021/acs.jctc.0c00007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Under irradiation in the visible range, the glyoxal-methanol complex in a cryogenic argon matrix undergoes a double proton transfer (DPT) reaction through which the glyoxal molecule isomerizes into hydroxyketene. In this work, we employ electronic structure simulations in order to shed more light on the underlying mechanism. Rewardingly, we find that the lowest singlet excited state (S1) of the complex acts as a gateway to two previously unknown isomerization pathways, of which one takes place entirely in the singlet manifold and the other also involves the lowest triplet state (T1). Both of these pathways are fully compatible with the available experimental data, implying that either or both are operative under experimental conditions. In either pathway, the methanol molecule acts as a proton shuttle between the proton-donating and proton-accepting sites of glyoxal, resulting in a dramatic lowering of the potential energy barrier to isomerization with respect to the case of isolated glyoxal. The occurrence of DPT in the singlet manifold is demonstrated directly with the use of nonadiabatic molecular dynamics simulations at the spin-flip time-dependent density functional theory level.
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7
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Gordon BP, Moore FG, Scatena LF, Richmond GL. On the Rise: Experimental and Computational Vibrational Sum Frequency Spectroscopy Studies of Pyruvic Acid and Its Surface-Active Oligomer Species at the Air–Water Interface. J Phys Chem A 2019; 123:10609-10619. [DOI: 10.1021/acs.jpca.9b08854] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Brittany P. Gordon
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Frederick G. Moore
- Department of Physics, Whitman College, Walla Walla, Washington 99362, United States
| | - Lawrence F. Scatena
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Geraldine L. Richmond
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
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8
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Gordon BP, Moore FG, Scatena LF, Valley NA, Wren SN, Richmond GL. Model Behavior: Characterization of Hydroxyacetone at the Air-Water Interface Using Experimental and Computational Vibrational Sum Frequency Spectroscopy. J Phys Chem A 2018; 122:3837-3849. [PMID: 29608301 DOI: 10.1021/acs.jpca.8b01193] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Small atmospheric aldehydes and ketones are known to play a significant role in the formation of secondary organic aerosols (SOA). However, many of them are difficult to experimentally isolate, as they tend to form hydration and oligomer species. Hydroxyacetone (HA) is unusual in this class as it contributes to SOA while existing predominantly in its unhydrated monomeric form. This allows HA to serve as a valuable model system for similar secondary organic carbonyls. In this paper the surface behavior of HA at the air-water interface has been investigated using vibrational sum frequency (VSF) spectroscopy and Wilhelmy plate surface tensiometry in combination with computational molecular dynamics simulations and density functional theory calculations. The experimental results demonstrate that HA has a high degree of surface activity and is ordered at the interface. Furthermore, oriented water is observed at the interface, even at high HA concentrations. Spectral features also reveal the presence of both cis and trans HA conformers at the interface, in differing orientations. Molecular dynamics results indicate conformer dependent shifts in HA orientation between the subsurface (∼5 Å deep) and surface. Together, these results provide a picture of a highly dynamic, but statistically ordered, interface composed of multiple HA conformers with solvated water. These results have implications for HA's behavior in aqueous particles, which may affect its role in the atmosphere and SOA formation.
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Affiliation(s)
- Brittany P Gordon
- Department of Chemistry , University of Oregon , 1253 University of Oregon , Eugene , Oregon 97403 , United States
| | - Frederick G Moore
- Department of Physics , Whitman College , Walla Walla , Washington 99362 , United States
| | - Lawrence F Scatena
- Department of Chemistry , University of Oregon , 1253 University of Oregon , Eugene , Oregon 97403 , United States
| | - Nicholas A Valley
- Department of Chemistry , University of Oregon , 1253 University of Oregon , Eugene , Oregon 97403 , United States.,Department of Science and Mathematics , California Northstate University College of Health Sciences , Rancho Cordova , California 95670 , United States
| | - Sumi N Wren
- Department of Chemistry , University of Oregon , 1253 University of Oregon , Eugene , Oregon 97403 , United States.,Department of Air Quality Process Research , Environment and Climate Change Canada (ECCC) , Toronto , Ontario M3H 5T4 , Canada
| | - Geraldine L Richmond
- Department of Chemistry , University of Oregon , 1253 University of Oregon , Eugene , Oregon 97403 , United States
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9
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Dargent D, Madebène B, Soulard P, Tremblay B, Zins EL, Alikhani ME, Asselin P. Conformational Landscape of the 1/1 Diacetyl/Water Complex Investigated by Infrared Spectroscopy and ab Initio Calculations. J Phys Chem A 2017; 121:88-97. [PMID: 27959532 DOI: 10.1021/acs.jpca.6b10492] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The complexes of diacetyl with water have been studied experimentally by Fourier transform infrared (FTIR) spectroscopy coupled to solid neon matrix and supersonic jet, and anharmonic ab initio calculations. The vibrational analysis of neon matrix spectra over the 100-7500 cm-1 infrared range confirms the existence of two nearly isoenergetic one-to-one (1/1) diacetyl-water S1 and S2 isomers already evidenced in a previous argon matrix study. A third form (S3) predicted slightly less stable ( J. Mol. Mod. 2015 , 21 , 214 ) is not observed. The correct agreement obtained between neon matrix and anharmonic calculated vibrational frequencies is exploited in several cases to derive band assignments for the vibrational modes of a specific isomer. Thereafter, theoretical xij anharmonic coupling constants are used for the attribution of combination bands and overtones relative to the 1/1 dimer. Finally, the most stable isomer of the one-to-two (1/2) diacetyl-water complex is identified in the OH stretching region of water on the grounds of comparison of experimental and calculated vibrational shifts between water dimer and the three most stable 1/2 isomers.
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Affiliation(s)
- D Dargent
- Sorbonne Universités, UPMC Université Paris 06, UMR 8233, MONARIS , F-75005, Paris, France.,CNRS, UMR 8233, MONARIS , F-75005, Paris, France
| | - B Madebène
- Sorbonne Universités, UPMC Université Paris 06, UMR 8233, MONARIS , F-75005, Paris, France.,CNRS, UMR 8233, MONARIS , F-75005, Paris, France
| | - P Soulard
- Sorbonne Universités, UPMC Université Paris 06, UMR 8233, MONARIS , F-75005, Paris, France.,CNRS, UMR 8233, MONARIS , F-75005, Paris, France
| | - B Tremblay
- Sorbonne Universités, UPMC Université Paris 06, UMR 8233, MONARIS , F-75005, Paris, France.,CNRS, UMR 8233, MONARIS , F-75005, Paris, France
| | - E L Zins
- Sorbonne Universités, UPMC Université Paris 06, UMR 8233, MONARIS , F-75005, Paris, France.,CNRS, UMR 8233, MONARIS , F-75005, Paris, France
| | - M E Alikhani
- Sorbonne Universités, UPMC Université Paris 06, UMR 8233, MONARIS , F-75005, Paris, France.,CNRS, UMR 8233, MONARIS , F-75005, Paris, France
| | - P Asselin
- Sorbonne Universités, UPMC Université Paris 06, UMR 8233, MONARIS , F-75005, Paris, France.,CNRS, UMR 8233, MONARIS , F-75005, Paris, France
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10
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Porterfield JP, Baraban JH, Troy TP, Ahmed M, McCarthy MC, Morgan KM, Daily JW, Nguyen TL, Stanton JF, Ellison GB. Pyrolysis of the Simplest Carbohydrate, Glycolaldehyde (CHO−CH2OH), and Glyoxal in a Heated Microreactor. J Phys Chem A 2016; 120:2161-72. [DOI: 10.1021/acs.jpca.6b00652] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Tyler P. Troy
- Chemical
Sciences Division, Lawrence Berkeley National Laboratories, Berkeley, California 94720, United States
| | - Musahid Ahmed
- Chemical
Sciences Division, Lawrence Berkeley National Laboratories, Berkeley, California 94720, United States
| | - Michael C. McCarthy
- Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, United States
| | - Kathleen M. Morgan
- Department
of Chemistry, Xavier University of Louisiana, New Orleans, Louisiana 70125-1098, United States
| | | | - Thanh Lam Nguyen
- Department
of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - John F. Stanton
- Department
of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
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11
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Energy, structure and topological characterization of the isomers of the 1/2 diacetyl/water complex. Theor Chem Acc 2016. [DOI: 10.1007/s00214-015-1793-5] [Citation(s) in RCA: 3] [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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12
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Dargent D, Zins EL, Madebène B, Alikhani ME. Topological insights into the 1/1 diacetyl/water complex gained using a new methodological approach. J Mol Model 2015. [PMID: 26224601 DOI: 10.1007/s00894-015-2751-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The 1/1 diacetyl/water complex is of atmospheric relevance. Previous experimental and theoretical studies have focused on two isomeric forms, and geometry optimizations were carried out on them. Herein, we propose a six-step methodological approach based on topological properties to search for and characterize all of the isomeric forms of the 1/1 noncovalent diacetyl/water complex: (1) a molecular electrostatic potential (MESP) study to get an overview of the V min and V max regions on the molecular surfaces of the separate molecules (diacetyl and water); (2) a topological (QTAIM and ELF) study allowing thorough characterization of the electron densities (QTAIM) and irreducible ELF basins of the separate molecules; (3) full optimization of the predicted structures based on the interaction between complementary reaction sites; (4) energetic characterization based on a symmetry-adapted perturbation theory (SAPT) analysis; (5) topological characterization of the optimized complexes; (6) analysis of the complexes in terms of orbital overlaps (natural bond orbitals, NBO analysis). Using this approach, in addition to achieving the topological characterization of the two isomeric forms already reported, a third possible isomer was identified and characterized. Graphical Abstract Topological tools to study monohydrated complexes.
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Affiliation(s)
- D Dargent
- Sorbonne Universités, UPMC Univ. Paris 06, MONARIS, UMR 8233, Université Pierre et Marie Curie, Pr. M. Esmaïl Alikhani CC 49, 4 place Jussieu, 75252, Paris, France
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13
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Wren SN, Gordon BP, Valley NA, McWilliams LE, Richmond GL. Hydration, Orientation, and Conformation of Methylglyoxal at the Air–Water Interface. J Phys Chem A 2015; 119:6391-403. [DOI: 10.1021/acs.jpca.5b03555] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sumi N. Wren
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - Brittany P. Gordon
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - Nicholas A. Valley
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - Laura E. McWilliams
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
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14
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Karpfen A. On the potential energy surfaces of dimers formed between trans-glyoxal, trans-acrolein and formaldehyde. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.03.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Hazra MK, Francisco JS, Sinha A. Hydrolysis of Glyoxal in Water-Restricted Environments: Formation of Organic Aerosol Precursors through Formic Acid Catalysis. J Phys Chem A 2014; 118:4095-105. [DOI: 10.1021/jp502126m] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Montu K. Hazra
- Chemical
Sciences Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India
| | - Joseph S. Francisco
- Department
of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, United States
| | - Amitabha Sinha
- Department
of Chemistry and Biochemistry, University of California—San Diego, La Jolla, California 92093-0314, United States
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16
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Grzechnik K, Mielke Z. Structure and photochemistry of nitrous acid–methanethiol complexes in solid argon. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.03.043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Profeta LTM, Sams RL, Johnson TJ, Williams SD. Quantitative infrared intensity studies of vapor-phase glyoxal, methylglyoxal, and 2,3-butanedione (diacetyl) with vibrational assignments. J Phys Chem A 2011; 115:9886-900. [PMID: 21755958 DOI: 10.1021/jp204532x] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Glyoxal, methylglyoxal, and 2,3-butanedione (diacetyl) are all known biomass burning effluents and suspected aerosol precursors. Pressure-broadened quantitative infrared spectra of glyoxal, methylglyoxal, and diacetyl vapors covering the 520-6500 cm(-1) range are reported at 0.112 cm(-1) resolution, each with a composite spectrum derived from a minimum of 10 different sample pressures for the compound, representing some of the first quantitative intensity data for these analytes. Many vibrational assignments for methylglyoxal are reported for the first time, as are some near-IR and far-IR bands of glyoxal and diacetyl. To complete the vibrational assignments, the far-infrared spectra (25-600 cm(-1)) of all three vapors are also reported, those of methylglyoxal for the first time. Density functional theory and ab initio MP2 theory are used to help assign vibrational modes. Potential bands for atmospheric monitoring are discussed.
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Affiliation(s)
- Luisa T M Profeta
- Pacific Northwest National Laboratory, Richland, Washington 99354, United States
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18
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Affiliation(s)
- Veronica Vaida
- Department of Chemistry and Biochemistry, CIRES, University of Colorado, Boulder, Colorado 80309-0215, USA
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20
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Sennikov PG, Ignatov SK, Schrems O. Identification of the products of partial hydrolysis of silicon tetrafluoride by matrix isolation IR spectroscopy. RUSS J INORG CHEM+ 2010. [DOI: 10.1134/s0036023610030198] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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21
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Karpfen A, Kryachko ES. The dimers of glyoxal and acrolein with H2O and HF: Negative intramolecular coupling and blue-shifted C–H stretch. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.02.054] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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22
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Favero LB, Caminati W. Hydrated complexes of atmospheric interest: rotational spectrum of diacetyl-water. J Phys Chem A 2009; 113:14308-11. [PMID: 20028157 DOI: 10.1021/jp903022x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The rotational spectrum of the molecular complex diacetyl-water has been measured by pulsed jet Fourier transform microwave (FTMW) spectroscopy. The water molecule acts as an electrofore and induces a dipole moment when combined with nonpolar diacetyl. Only one conformer has been observed, corresponding to the global minimum. Its shape is unambiguously established: the water moiety is linked asymmetrically to the organic molecule; it behaves as a proton donor to one of its oxygen atoms and interferes with the internal rotation of adjacent methyl group through a C-H...O interaction. Each rotational transition appears as a quintuplet, due to the internal rotation of the two methyl groups, which are nonequivalent in the adduct. From the analysis of the observed splittings, the V(3) barriers to the internal rotation of the two methyl groups have been determined to be 3.81(2) and 4.11(2) kJ/mol, respectively.
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Affiliation(s)
- Laura B Favero
- Istituto per lo Studio dei Materiali Nanostrutturati (Sezione di Bologna), Consiglio Nazionale delle Ricerche, Via Gobetti 101, I-40129 Bologna, Italy
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23
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Mucha M, Mielke Z. Photochemistry of the glyoxal–hydrogen peroxide complexes in solid argon: Formation of 2-hydroxy-2-hydroperoxyethanal. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.09.082] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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24
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Mucha M, Mielke Z. Structure and photochemistry of the methanol complexes with methylglyoxal and diacetyl: FTIR matrix isolation and theoretical study. Chem Phys 2009. [DOI: 10.1016/j.chemphys.2009.05.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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25
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Mielke Z, Mucha M, Bil A, Golec B, Coussan S, Roubin P. Photo-induced hydrogen exchange reaction between methanol and glyoxal: formation of hydroxyketene. Chemphyschem 2009; 9:1774-80. [PMID: 18613199 DOI: 10.1002/cphc.200800249] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We study the structure and photochemistry of the glyoxal-methanol system (G-MeOH) by means of FTIR matrix isolation spectroscopy and ab initio calculations. The FTIR spectra show that the non-hydrogen-bonded complex, G-MeOH-1, is present in an inert environment of solid argon. MP2/aug-cc-pVDZ calculations indicate that G-MeOH-1 is the most stable complex among the five optimized structures. The interaction energy partitioned according to the symmetry-adapted perturbation theory (SAPT) scheme demonstrates that the dispersion energy gives a larger contribution to the stabilization of a non-hydrogen-bonded G-MeOH-1 complex than compared to the hydrogen-bonded ones. The irradiation of G-MeOH-1 with the filtered output of a mercury lamp (lambda>370 nm) leads to its photo-conversion into the hydroxyketene-methanol complex HK-MeOH-1. The identity of HK-MeOH-1 is confirmed by both FTIR spectroscopy and MP2/aug-cc-pVDZ calculations. An experiment with deuterated methanol (CH(3)OD) evidences that hydroxyketene is formed in a photo-induced hydrogen exchange reaction between glyoxal and methanol. The pathway for the photo-conversion of G-MeOH-1 to HK-MeOH-1 is studied by a coupled-cluster method [CR-CC(2,3)]. The calculations confirm our experimental findings that the reaction proceeds via hydrogen atom exchange between the OH group of methanol and CH group of glyoxal.
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Affiliation(s)
- Zofia Mielke
- Faculty of Chemistry, Wrocław University, Joliot-Curie 14, 50-383 Wrocław, Poland
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