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Smart SE, Scrape PG, Butler LJ, Mazziotti DA. Using reduced density matrix techniques to capture static and dynamic correlation in the energy landscape for the decomposition of the CH2CH2ONO radical and support a non-IRC pathway. J Chem Phys 2018; 149:024302. [DOI: 10.1063/1.5024512] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Affiliation(s)
- Scott E. Smart
- The James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, USA
| | - Preston G. Scrape
- The James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, USA
| | - Laurie J. Butler
- The James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, USA
| | - David A. Mazziotti
- The James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, USA
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Scrape PG, Roberts TD, Lee SH, Butler LJ. Dissociation Pathways of the CH2CH2ONO Radical: NO2 + Ethene, NO + Oxirane, and a Non-Intrinsic Reaction Coordinate HNO + Vinoxy Pathway. J Phys Chem A 2016; 120:4973-87. [PMID: 27124098 DOI: 10.1021/acs.jpca.5b12669] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We first characterize the dissociation pathways of BrCH2CH2ONO, a substituted alkyl nitrite, upon photoexcitation at 193 nm under collision-free conditions, in a crossed laser-molecular beam scattering apparatus using vacuum ultraviolet photoionization detection. Three primary photodissociation pathways occur: photoelimination of HNO, leading to the products HNO + BrCH2CHO; C-Br bond photofission, leading to Br + CH2CH2ONO; and O-NO bond photofission, leading to NO + BrCH2CH2O. The data show that alkyl nitrites can eliminate HNO via a unimolecular mechanism in addition to the commonly accepted bulk disproportionation mechanism. Some of the products from the primary photodissociation pathways are highly vibrationally excited, so we then probe the product branching from the unimolecular dissociation of these unstable intermediates. Notably, the vibrationally excited CH2CH2ONO radicals undergo two channels predicted by statistical transition-state theory, and an additional non-intrinsic reaction coordinate channel, HNO elimination. CH2CH2ONO is formed with high rotational energy; by employing rotational models based on conservation of angular momentum, we predict, and verify experimentally, the kinetic energies of stable CH2CH2ONO radicals and the angular distribution of dissociation products. The major dissociation pathway of CH2CH2ONO is NO2 + ethene, and some of the NO2 is formed with sufficient internal energy to undergo further photodissociation. Nascent BrCH2CHO and CH2Br are also photodissociated upon absorption of a second 193 nm photon; we derive the kinetic energy release of these dissociations based on our data, noting similarities to the analogous photodissociation of ClCH2CHO and CH2Cl.
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Affiliation(s)
- Preston G Scrape
- The James Franck Institute and Department of Chemistry, The University of Chicago , Chicago, Illinois 60637, United States
| | - Trevor D Roberts
- The James Franck Institute and Department of Chemistry, The University of Chicago , Chicago, Illinois 60637, United States
| | - Shih-Huang Lee
- National Synchrotron Radiation Research Center , Hsinchu 30076, Taiwan, Republic of China
| | - Laurie J Butler
- The James Franck Institute and Department of Chemistry, The University of Chicago , Chicago, Illinois 60637, United States
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McLaughlin RP, O'Sullivan D, Sodeau JR. Cold-surface photochemistry of primary and tertiary alkyl nitrites. J Phys Chem A 2012; 116:6759-70. [PMID: 22606955 DOI: 10.1021/jp303228p] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reflection-absorption infrared spectroscopy (RAIRS) is used to explore the photochemistry of primary and tertiary alkyl nitrites deposited on a gold surface. The primary alkyl nitrites examined for this study were n-butyl, isobutyl, and isopentyl nitrite. These compounds showed qualitatively similar spectra to those observed in previous condensed-phase measurements. The photolysis of the primary nitrites involved the initial formation of an alkoxy radical and NO, followed by production of nitroxyl (HNO) and an aldehydic species. In addition, the formation of nitrous oxide, identified from its distinctive transition near 2230 cm(-1), was observed to form from the self-reaction of nitroxyl. The reaction rates for cis and trans conformer decay, as tracked through their intense N═O stretching modes, were found to be significantly different, potentially due to a structural bias that favors HNO formation for the initial trans conformer photoproducts over recombination. Tert-butyl nitrite demonstrates only the trans conformer in the RAIRS spectra prior to photolysis; however, recombination of the initial NO and RO(•) photoproducts was observed to produce the cis conformer in the photolyzed samples. The primary photoproducts from tert-butyl nitrite can also react to form acetone and nitrosomethane, but the absence of HNO prohibits the formation of N(2)O that was observed for the primary alkyl nitrites. Additionally, the RAIRS spectrum of isobutyl nitrite co-deposited with water was measured to examine the photolysis of this species on a water-ice surface. No change in the identity of the photoproducts was observed in this experiment, and minimal frequency shifting (1-3 cm(-1)) of the vibrational modes occurred. In addition to being a known atmospheric source of NO and various aldehydes, our results point to cold surface processing of alkyl nitrites as a potential environmental source of nitrous oxide.
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Affiliation(s)
- Ryan P McLaughlin
- Department of Chemistry, Center for Research in Atmospheric Chemistry, University College Cork, Cork, Ireland.
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McLaughlin RP, Donald WA, Jitjai D, Zhang Y. Vibrational analysis of n-butyl, isobutyl, sec-butyl and tert-butyl nitrite. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2007; 67:178-87. [PMID: 16945579 DOI: 10.1016/j.saa.2006.06.042] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2006] [Revised: 06/28/2006] [Accepted: 06/29/2006] [Indexed: 05/11/2023]
Abstract
Raman and infrared spectra of n-butyl, isobutyl, sec-butyl and tert-butyl nitrite are reported. Density functional theory and Møeller-Plesset calculations with 6-31G* and 6-311G* basis sets were used to determine ground state molecular geometries and vibrational frequencies of these compounds. Calculations and spectral data of these molecules were used to perform partial vibrational mode assignments for the observed transitions. In agreement with previous investigations of alkyl nitrites, cis and trans rotational conformers of n-butyl, isobutyl and sec-butyl nitrite were observed in the gas phase infrared spectra and the condensed phase Raman and infrared spectra. Among the several predicted geometries of these compounds, the cis-trans geometry (cis with respect to the C-O-N=O dihedral angle and trans with respect to the C-C-O-N dihedral) was calculated to be the most stable conformer of n-butyl and isobutyl nitrite, while the cis-gauche conformer was found to be the most stable geometry of sec-butyl nitrite. The cis-type structures of these three molecules are favored due to formation of a pseudo hydrogen bond between the nitrite group and the alpha-carbon hydrogen atoms. Hindrance with the alkyl moiety, however, causes the trans conformer (trans with respect to the C-O-N=O dihedral) of tert-butyl nitrite to lie lower than its cis conformer, a result that was supported by our spectroscopic measurements. The characteristic N=O stretch frequency for the trans conformers of all the compounds examined was observed to decrease with increasing branching at the alpha-carbon, while the same mode for the cis conformers shows no change among the primary and secondary nitrites. Evidence is also provided that suggests that the relative number of cis conformers to trans conformers decreases as the alpha-carbon branching increases.
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Affiliation(s)
- Ryan P McLaughlin
- Department of Chemistry, 901 12th Avenue, P.O. Box 222000, Seattle University, Seattle, WA 98122-1090, USA.
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Wang X, Wang Y, Lv C, Kubo M, Miyamoto A. Investigation of the photo-dissociation reactions for alkyl nitrite by quantum chemical molecular dynamics program “Colors-Excite”. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2006.10.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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6
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Buck U. Photodissociation of Hydrogen Halide Molecules in Different Cluster Environments. J Phys Chem A 2002. [DOI: 10.1021/jp0208079] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Udo Buck
- Max-Planck-Institut für Strömungsforschung, Bunsenstrasse 10, D-37073 Göttingen, Germany
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Kim SK, White JM, Agrawal PM, Thompson DL. Photodissociation of methyl nitrite on Ag(111): Simulation. J Chem Phys 2001. [DOI: 10.1063/1.1407000] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Zhao W, Kim C, White JM, Kim SK. Photodissociation Dynamics of tert-Butyl Nitrite on Ag(111): Characterization of Translationally and Internally Excited NO Fragments. J Phys Chem A 2001. [DOI: 10.1021/jp003101s] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- W. Zhao
- Department of Chemistry & Biochemistry, Center for Materials Chemistry, University of Texas at Austin, Austin, Texas 78712-1167
| | - C. Kim
- Department of Chemistry & Biochemistry, Center for Materials Chemistry, University of Texas at Austin, Austin, Texas 78712-1167
| | - J. M. White
- Department of Chemistry & Biochemistry, Center for Materials Chemistry, University of Texas at Austin, Austin, Texas 78712-1167
| | - S. K. Kim
- Department of Chemistry, Sungkyunkwan University, Suwon, 440-746, Korea
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Fieberg JE, White JM. Photodissociation of methyl nitrite on Ag(111): Nitric oxide ejection dynamics. J Chem Phys 2000. [DOI: 10.1063/1.1287713] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Charlebois JP, DeLeon RL, Garvey JF. Chemical Reactivity of [(NO)n(ROH)m]+ Cluster Ions. J Phys Chem A 2000. [DOI: 10.1021/jp001594v] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Jay P. Charlebois
- Department of Chemistry, Natural Science & Mathematics Building, State University of New York at Buffalo, Buffalo, New York, 14260-3000
| | - Robert L. DeLeon
- Department of Chemistry, Natural Science & Mathematics Building, State University of New York at Buffalo, Buffalo, New York, 14260-3000
| | - James F. Garvey
- Department of Chemistry, Natural Science & Mathematics Building, State University of New York at Buffalo, Buffalo, New York, 14260-3000
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Makarov VI, Quiñones E. Photobleaching of the SO2 transition caused by optically pumping the state. J Photochem Photobiol A Chem 2000. [DOI: 10.1016/s1010-6030(00)00269-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Furlan A. Photodissociation of an alkyl nitrite at a liquid surface: flight-time distributions of NO and HNO. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)00692-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Fieberg JE, White J. Dynamics of NO produced by photodissociation of t-butyl nitrite on Ag(111). Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)00418-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Conde C, Maul C, Quiñones E. State-Resolved Photofragmentation of [ClNO]n van der Waals Clusters in a Supersonic Jet. J Phys Chem A 1999. [DOI: 10.1021/jp9840127] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Carlos Conde
- Department of Chemistry, University of Puerto Rico, P.O. Box 23346, San Juan, Puerto Rico 00931-3346
| | - Christof Maul
- Department of Chemistry, University of Puerto Rico, P.O. Box 23346, San Juan, Puerto Rico 00931-3346
| | - Edwin Quiñones
- Department of Chemistry, University of Puerto Rico, P.O. Box 23346, San Juan, Puerto Rico 00931-3346
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Kreher CJ, Carter RT, Huber JR. Photodissociation of OClO and Ar/OClO and H2O/OClO clusters studied by the resonance enhanced multiphoton ionization-time of flight method. J Chem Phys 1999. [DOI: 10.1063/1.478196] [Citation(s) in RCA: 15] [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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Jenniskens HG, Philippe L, Kadodwala M, Kleyn AW. The Wavelength Dependence of tert-Butyl Nitrite Surface Photochemistry. J Phys Chem B 1998. [DOI: 10.1021/jp980325q] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hans G. Jenniskens
- FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, Netherlands
| | - Laurent Philippe
- FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, Netherlands
| | - Malcolm Kadodwala
- FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, Netherlands
| | - Aart W. Kleyn
- FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, Netherlands
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Fenner K, Furlan A, Huber JR. Photofragmentation of OClO Clusters in a Supersonic Jet at 360 and 275 nm. J Phys Chem A 1997. [DOI: 10.1021/jp9710289] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kathrin Fenner
- Physikalisch-Chemisches Institut, der Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Alan Furlan
- Physikalisch-Chemisches Institut, der Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - J. Robert Huber
- Physikalisch-Chemisches Institut, der Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
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