1
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Li X, Fan W, Wang L, Jiang J, Du Y, Fang W, Trabelsi T, Francisco JS, Yang J, Li J, Zhou M, Zeng X. Direct Observation of HOON Intermediate in the Photochemistry of HONO. J Am Chem Soc 2024; 146:20494-20499. [PMID: 39001838 DOI: 10.1021/jacs.4c06851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/15/2024]
Abstract
The photochemistry of nitrous acid (HONO), encompassing dissociation into OH and NO as well as the reverse association reaction, plays a pivotal role in atmospheric chemistry. Here, we report the direct observation of nitrosyl-O-hydroxide (HOON) in the photochemistry of HONO, employing matrix-isolation IR and UV-vis spectroscopy. Despite a barrier of approximately 30 kJ/mol, HOON undergoes spontaneous rearrangement to the more stable HONO isomer through quantum mechanical tunneling, with a half-life of 28 min at 4 K. Kinetic isotope effects and instanton theory calculations reveal that the tunneling process involves the concerted motion of the NO moiety (65.2%) and the hydrogen atom (32.3%). Our findings underscore the significance of HOON as a key intermediate in the photolytic dissociation-association cycle of HONO at low temperatures.
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Affiliation(s)
- Xiaolong Li
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Wenbin Fan
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Lina Wang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Junjie Jiang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Yanqi Du
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Wei Fang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Tarek Trabelsi
- Department of Earth and Environment Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6243, United States
| | - Joseph S Francisco
- Department of Earth and Environment Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6243, United States
| | - Jiawei Yang
- School of Chemistry and Chemical Engineering and Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 401331, China
| | - Jun Li
- School of Chemistry and Chemical Engineering and Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing 401331, China
| | - Mingfei Zhou
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Xiaoqing Zeng
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
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2
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Li X, Lu B, Jiang J, Wang L, Trabelsi T, Francisco JS, Fang W, Zhou M, Zeng X. Water Complex of Imidogen. J Am Chem Soc 2023; 145:1982-1987. [PMID: 36633923 DOI: 10.1021/jacs.2c12808] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Imidogen (NH) is the simplest nitrogen hydride that plays an important role in combustion and interstellar chemistry, and its combination with H2O is the prototypical amidation reaction of O-H bonds involving a nitrene intermediate. Herein, we report the observation of the elusive water complex of NH, a prereaction complex associated with the amidation reaction in a solid N2 matrix at 10 K. The hydrogen-bonded structure of NH···OH2 (versus HN···HOH) is confirmed via IR spectroscopy with comprehensive isotope labeling (D, 18O, and 15N) and quantum chemical calculations at the UCCSD(T)/aug-cc-pVQZ level of theory. In line with the observed absorption at 350 nm, irradiation of the complex at 365 nm leads to O-H bond insertion, yielding hydroxylamine NH2OH.
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Affiliation(s)
- Xiaolong Li
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, 200433 Shanghai, China
| | - Bo Lu
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, 200433 Shanghai, China
| | - Junjie Jiang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, 200433 Shanghai, China
| | - Lina Wang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, 200433 Shanghai, China
| | - Tarek Trabelsi
- Department of Earth and Environment Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6243, United States
| | - Joseph S Francisco
- Department of Earth and Environment Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6243, United States
| | - Wei Fang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, 200433 Shanghai, China
| | - Mingfei Zhou
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, 200433 Shanghai, China
| | - Xiaoqing Zeng
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, 200433 Shanghai, China
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3
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Lu B, Shao X, Jiang X, Wang L, Xue J, Rauhut G, Tan G, Fang W, Zeng X. Diazophosphane HPN 2. J Am Chem Soc 2022; 144:21853-21857. [PMID: 36445205 DOI: 10.1021/jacs.2c10003] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Diazophosphane HPN2, a heavy analogue of hydrazoic acid (HN3), has been synthesized at low temperature (10 K) through photolytic reactions of molecular nitrogen (N2) with phosphine (PH3) and phosphaketene (HPCO) under irradiations at 193 and 365 nm, respectively. The characterization of HPN2 and its isotopologues DPN2 and HP15N2 by matrix-isolation IR and UV-vis spectroscopy is supported by quantum chemical calculations at the CCSD(T)-F12a/cc-pVTZ-F12 level of theory. Upon irradiation at 266 nm, the P-N bond in HPN2 breaks, whereas its photolysis at 193 nm generates the elusive phosphinyl radical •PN2.
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Affiliation(s)
- Bo Lu
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Xin Shao
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Xin Jiang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Lina Wang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Junfei Xue
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Guntram Rauhut
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Gengwen Tan
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Wei Fang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Xiaoqing Zeng
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, Shanghai 200433, China
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4
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Bhagat V, Schumann J, Bettinger HF. Unusual Nitrene Oxidation Product Formation by Metathesis Involving the Dioxygen O-O and Borylnitrene B-N Bonds. Chemistry 2020; 26:12654-12663. [PMID: 32902001 PMCID: PMC7590100 DOI: 10.1002/chem.202002445] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 06/11/2020] [Indexed: 01/08/2023]
Abstract
The reaction of dioxygen with nitrenes can have significant energy barriers, although both reactants are triplet diradicals and the formation of nitroso-O-oxides is spin-allowed. By means of matrix-isolation infrared spectroscopy in solid argon, nitrogen, and neon, and through high-level computational quantum chemistry, it is shown herein that a 3-nitreno-1,3,2-benzodioxaborole CatBN (Cat=catecholato) reacts with dioxygen under cryogenic conditions thermally at temperatures as low as 7 K to produce two distinct products, an anti-nitroso-O-oxide and a nitritoborane CatBONO. The computed barriers for the formation of nitroso-O-oxide isomers are very low. Whereas anti-nitroso-O-oxide is kinetically trapped, its bisected isomer has a very low barrier for metathesis, yielding the CatBO+NO radicals in a strongly exothermic reaction; these radicals can combine under matrix-isolation conditions to give nitritoborane CatBONO. The trapped isomer, anti-nitroso-O-oxide, can form the nitritoborane CatBONO only after photoexcitation, possibly involving isomerization to the bisected isomer of anti-nitroso-O-oxide.
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Affiliation(s)
- Virinder Bhagat
- Institut für Organische ChemieUniversität TübingenAuf der Morgenstelle 1872076TübingenGermany
| | - Julia Schumann
- Institut für Organische ChemieUniversität TübingenAuf der Morgenstelle 1872076TübingenGermany
| | - Holger F. Bettinger
- Institut für Organische ChemieUniversität TübingenAuf der Morgenstelle 1872076TübingenGermany
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5
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Yusupova AR, Safiullin RL, Khursan SL. Conformational Transformations in Aromatic Nitroso Oxides. J Phys Chem A 2016; 120:5693-705. [PMID: 27356269 DOI: 10.1021/acs.jpca.6b04282] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A systematic theoretical study on conformational transformations of monosubstituted (ortho- and para-) aromatic nitroso oxides R-C6H4NOO was performed. The existence of two rotation axes enables two types of conformational transitions in substituted arylnitroso oxides: trans/cis (rotation around the N-O bond) and syn/anti (rotation around the C-N bond, which is important in ortho isomers). The complete set of conformers was localized for R-C6H4NOO using four selected density functional (M06-L, mPWPW91, OLYP, and HCTH) and augmented polarization basis set of triple splitting. It was found that the activation enthalpy of the trans-cis conformational transition is nearly insensitive to the nature of R and ranges within 58-60 kJ/mol for para isomers. The ortho substituent has an insignificant effect on ΔH(≠)trans→cis: it increases this value by ∼5 kJ/mol in syn isomers and decreases it by ∼3 kJ/mol in anti isomers. On the contrary, the syn-anti conformational barrier is considerably affected by the substituent R; an increase in the electron-withdrawing properties of R decreases ΔH(≠)syn→anti. The activation enthalpies grow with increasing polarity of the solvent, as it was found using IEFPCM calculation. The values of relaxation time for all conformational equilibria were calculated and compared with known lifetimes of aromatic nitroso oxides. Our results suggest that syn/anti transitions occur fast enough in the scale of the experimental lifetime. However, trans/cis transformations proceed more slowly. And under certain conditions discussed in the paper, the rate of this conformational transition limits that of irreversible decay of nitroso oxide.
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Affiliation(s)
- Alfia R Yusupova
- Ufa Institute of Chemistry of the Russian Academy of Sciences , 71 pr. Oktyabrya, Ufa 450054, Russian Federation
| | - Rustam L Safiullin
- Ufa Institute of Chemistry of the Russian Academy of Sciences , 71 pr. Oktyabrya, Ufa 450054, Russian Federation
| | - Sergey L Khursan
- Ufa Institute of Chemistry of the Russian Academy of Sciences , 71 pr. Oktyabrya, Ufa 450054, Russian Federation
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6
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Seybold PG. Computational estimation of the acidities of some inorganic nitrogen acids. Mol Phys 2015. [DOI: 10.1080/00268976.2015.1076582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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7
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Lu HC, Lo JI, Lin MY, Peng YC, Chou SL, Cheng BM, Ogilvie JF. Infrared absorption spectra of methylidene radicals in solid neon. Chem Commun (Camb) 2014; 50:7968-70. [PMID: 24912563 DOI: 10.1039/c4cc02970d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Infrared absorption lines of methylidene--(12)C(1)H, (13)C(1)H, and (12)C(2)H--dispersed in solid neon at 3 K, recorded after photolysis of methane precursors with vacuum-ultraviolet light at 121.6 nm, serve as signatures of these trapped radicals.
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Affiliation(s)
- Hsiao-Chi Lu
- National Synchrotron Radiation Research Center, No. 101, Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
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8
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Liu YD, Selbes M, Zeng C, Zhong R, Karanfil T. Formation mechanism of NDMA from ranitidine, trimethylamine, and other tertiary amines during chloramination: a computational study. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:8653-63. [PMID: 24968236 PMCID: PMC4123930 DOI: 10.1021/es500997e] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 06/22/2014] [Accepted: 06/26/2014] [Indexed: 05/25/2023]
Abstract
Chloramination of drinking waters has been associated with N-nitrosodimethylamine (NDMA) formation as a disinfection byproduct. NDMA is classified as a probable carcinogen and thus its formation during chloramination has recently become the focus of considerable research interest. In this study, the formation mechanisms of NDMA from ranitidine and trimethylamine (TMA), as models of tertiary amines, during chloramination were investigated by using density functional theory (DFT). A new four-step formation pathway of NDMA was proposed involving nucleophilic substitution by chloramine, oxidation, and dehydration followed by nitrosation. The results suggested that nitrosation reaction is the rate-limiting step and determines the NDMA yield for tertiary amines. When 45 other tertiary amines were examined, the proposed mechanism was found to be more applicable to aromatic tertiary amines, and there may be still some additional factors or pathways that need to be considered for aliphatic tertiary amines. The heterolytic ONN(Me)2-R(+) bond dissociation energy to release NDMA and carbocation R(+) was found to be a criterion for evaluating the reactivity of aromatic tertiary amines. A structure-activity study indicates that tertiary amines with benzyl, aromatic heterocyclic ring, and diene-substituted methenyl adjacent to the DMA moiety are potentially significant NDMA precursors. The findings of this study are helpful for understanding NDMA formation mechanism and predicting NDMA yield of a precursor.
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Affiliation(s)
- Yong Dong Liu
- College
of Life Science & Bioengineering, Beijing
University of Technology, Beijing 100124, China
| | - Meric Selbes
- Department
of Environmental Engineering and Earth Science, Clemson University, 342 Computer Court, Anderson, South Carolina 29625, United States
| | - Chengchu Zeng
- College
of Life Science & Bioengineering, Beijing
University of Technology, Beijing 100124, China
| | - Rugang Zhong
- College
of Life Science & Bioengineering, Beijing
University of Technology, Beijing 100124, China
| | - Tanju Karanfil
- Department
of Environmental Engineering and Earth Science, Clemson University, 342 Computer Court, Anderson, South Carolina 29625, United States
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9
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Crabtree KN, Talipov MR, Martinez O, O'Connor GD, Khursan SL, McCarthy MC. Detection and structure of HOON: microwave spectroscopy reveals an O-O bond exceeding 1.9 Å. Science 2013; 342:1354-7. [PMID: 24337293 DOI: 10.1126/science.1244180] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Nitric oxide (NO) reacts with hydroxyl radicals (OH) in the gas phase to produce nitrous acid, HONO, but essentially nothing is known about the isomeric nitrosyl-O-hydroxide (HOON), owing to its perceived instability. We report the detection of gas-phase HOON in a supersonic molecular beam by Fourier transform microwave spectroscopy and a precise determination of its molecular structure by further spectroscopic analysis of its (2)H, (15)N, and (18)O isotopologs. HOON contains the longest O-O bond in any known molecule (1.9149 ± 0.0005 Å) and appears surprisingly stable, with an abundance roughly 3% that of HONO in our experiments.
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Affiliation(s)
- Kyle N Crabtree
- Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
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10
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Chainikova EM, Pankratyev EY, Teregulova AN, Gataullin RR, Safiullin RL. Thermal intramolecular transformation of key intermediates in the photooxidation of para-allyl-substituted phenyl azide. J Phys Chem A 2013; 117:2728-37. [PMID: 23473334 DOI: 10.1021/jp401038g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The electronic spectra, kinetic regularities, and the mechanism of decay of the cis and trans isomeric forms of 4-[(2E)-1-methylbut-2-en-1-yl]phenylnitroso oxide (2) were studied by flash photolysis and product analysis. The mechanism of the consumption of this nitroso oxide is the same as the one proposed earlier for 4-methoxyphenylnitroso oxide. The trans-2 isomer is converted into cis-2, which undergoes cyclization to the substituted benzo[d][1,2,3]dioxazole 3. The reopening of the dioxazole ring yields nitrile oxide 4. The final product (3,4-dimethyl-3a,4-dihydro-2,1-benzisoxazol-5(3H)-ylidene)acetaldehyde (5) is formed by the intramolecular [3 + 2]-cycloaddition of the nitrile oxide group of 4 to the allylic double bond. To support the proposed mechanism, the quantum chemical calculations have been employed.
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Affiliation(s)
- Ekaterina M Chainikova
- Institute of Organic Chemistry, Ufa Scientific Center, The Russian Academy of Sciences, 71 prosp. Oktyabrya, 450054 Ufa, Russian Federation.
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11
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Zeng X, Beckers H, Willner H. Thermally Persistent Fluorosulfonyl Nitrene and Unexpected Formation of the Fluorosulfonyl Radical. J Am Chem Soc 2013; 135:2096-9. [DOI: 10.1021/ja312073w] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Xiaoqing Zeng
- Bergische Universität Wuppertal, FB
C, Mathematik
und Naturwissenschaften, Fachgruppe Chemie, Wuppertal, Germany
| | - Helmut Beckers
- Bergische Universität Wuppertal, FB
C, Mathematik
und Naturwissenschaften, Fachgruppe Chemie, Wuppertal, Germany
| | - Helge Willner
- Bergische Universität Wuppertal, FB
C, Mathematik
und Naturwissenschaften, Fachgruppe Chemie, Wuppertal, Germany
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12
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Talipov MR, Timerghazin QK, Safiullin RL, Khursan SL. No Longer a Complex, Not Yet a Molecule: A Challenging Case of Nitrosyl O-Hydroxide, HOON. J Phys Chem A 2013; 117:679-85. [DOI: 10.1021/jp3110858] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marat R. Talipov
- Institute of Organic Chemistry, Ufa Scientific Centre, Russian Academy of Sciences, pr. Oktyabrya 71, Ufa,
450054 Russian Federation
- Department of Chemistry, Marquette University, Wehr Chemistry Building, Milwaukee, WI-53201-1881,
USA
| | - Qadir K. Timerghazin
- Department of Chemistry, Marquette University, Wehr Chemistry Building, Milwaukee, WI-53201-1881,
USA
| | - Rustam L. Safiullin
- Institute of Organic Chemistry, Ufa Scientific Centre, Russian Academy of Sciences, pr. Oktyabrya 71, Ufa,
450054 Russian Federation
| | - Sergey L. Khursan
- Institute of Organic Chemistry, Ufa Scientific Centre, Russian Academy of Sciences, pr. Oktyabrya 71, Ufa,
450054 Russian Federation
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13
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Chainikova EM, Safiullin RL, Spirikhin LV, Abdullin MF. A revised mechanism of thermal decay of arylnitroso oxides. J Phys Chem A 2012; 116:8142-7. [PMID: 22803653 DOI: 10.1021/jp301699p] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The electronic spectra were measured and the unimolecular decay kinetics of the isomeric forms (cis and trans) of 4-methoxyphenylnitroso oxide in acetonitrile, benzene, and hexane was studied using flash photolysis. The cis form absorbed in a shorter wavelength region and was more labile than the trans form. The difference between the reactivity of the two species increased on going from hexane to acetonitrile. The temperature dependences of reaction rate constants were studied for both isomeric forms. The analysis of products of flash photolysis of 4-methoxyphenyl azide in the presence of oxygen allowed for understanding the mechanism of thermal decay of nitroso oxides. It was shown that the trans nitroso oxide is converted into cis nitroso oxide. The latter undergoes an unusual ring cleavage reaction to form 4-methoxy-6-oxohexa-2,4-dienenitrile N-oxide derivative. We conclude that the nitro- and nitrosobenzenes, which are the main products of the steady-state photolysis of aromatic azides in the presence of oxygen, are formed by the photochemical transformation of the nitroso oxides.
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Affiliation(s)
- Ekaterina M Chainikova
- Institution of the Russian Academy of Sciences Institute of Organic Chemistry, Ufa Scientific Center of the Russian Academy of Sciences, 71 prosp. Oktyabrya, 450054 Ufa, Russian Federation.
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14
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Talipov MR, Khursan SL, Safiullin RL. The reaction of nitroso oxides with olefins: Concerted or nonconcerted addition? RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2011. [DOI: 10.1134/s0036024411030290] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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15
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Talipov MR, Khursan SL, Safiullin RL. RRKM and ab initio investigation of the NH (X) oxidation by dioxygen. J Phys Chem A 2009; 113:6468-76. [PMID: 19441782 DOI: 10.1021/jp902527a] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We performed a detailed study of the NH + O(2) potential energy surface by means of a number of multireference (CASSCF, MC-QDPT2, MR-AQCC, MR-CISD(18;13)+Q with 6-311+G(d,p), and aug-cc-pVTZ basis sets) and composite (G3B3, G3MP2B3, CBS-QB3, W1U) methods. Parent nitroso oxide, HNOO, was found to be the key intermediate of this process. In its ground state, (1)A', HNOO exists in two conformations, where the cis form is 8.1-10.9 kJ x mol(-1) more stable than the trans-nitroso oxide. The mechanism of nitrene oxidation by dioxygen may be represented as a set of various transformations of vibrationally excited HNOO, namely, decomposition into NO and OH radical pair, O-O dissociation reaction, and a number of thermal deactivation processes. We localized all stationary points of these transformations on both the singlet and the triplet reaction PES. The energies of reactants, products, and transition states were calculated at the RI-MR-CISD(18;13)+Q/aug-cc-pVTZ level of theory; the vibrational analysis of these species was done by means of CASSCF(18;13)/6-311+G(d,p). Apparent rate constants of the NH + O(2) reaction were calculated using RRKM theory. The total rate constant k(total) corresponds well to available experimental data. The temperature dependence of k(total) is rather nontrivial and consists of three quasi-linear intervals. At low temperatures (up to room temperature) the slope of log(k(total)) vs 1/T is negative due to prevailing stabilization of HNOO. The rate-determining channel of the "NH + O(2)" reaction in the medium-temperature interval (up to approximately 1000 K) was found to be formation of the NO + OH radical pair via H transfer to the terminal oxygen atom. This reaction is accelerated by a factor of 4.2 (214 K) and 1.2 (2500 K) due to tunnel effect. The distinctive feature of the NH + O(2) high-temperature chemistry is the increase of the effective activation energy due to prevailing dissociation of the HNOO peroxide bond.
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Affiliation(s)
- Marat R Talipov
- Institute of Organic Chemistry, Ufa Scientific Centre, Russian Academy of Sciences, pr. Oktyabrya 71, Ufa, 450054 Russia.
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16
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Gritsan NP. Study of photochemical transformations of organic azides by matrix isolation techniques and quantum chemistry. RUSSIAN CHEMICAL REVIEWS 2008. [DOI: 10.1070/rc2007v076n12abeh003702] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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17
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Asatryan R, Bozzelli JW, Simmie JM. Thermochemistry for enthalpies and reaction paths of nitrous acid isomers. INT J CHEM KINET 2007. [DOI: 10.1002/kin.20247] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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18
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Bettinger HF, Bornemann H. Donor Stabilized Borylnitrene: A Highly Reactive BN Analogue of Vinylidene. J Am Chem Soc 2006; 128:11128-34. [PMID: 16925431 DOI: 10.1021/ja061346y] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A donor atom stabilized borylnitrene, 2-nitreno-1,3,2-benzodioxaborole 4c, is characterized by matrix isolation IR, UV, and ESR spectroscopy as well as multiconfiguration SCF and CI computations. UV irradiation (lambda = 254 nm) of the corresponding azide 6c, isolated in solid argon at 10 K, produces 4c in high yield. The oxygen donor atoms in 4c result in a triplet ground state (|D/hc| = 1.492 cm(-)(1), |E/hc| = 0.004 cm(-)(1)) for the borylnitrene. The lowest energy singlet state ((1)A(1)) is 33 kcal mol(-)(1) higher in energy and closely related to the ground state of vinylidene. Under the conditions of matrix isolation, triplet 4c is photochemically and thermally stable toward rearrangement to the corresponding cyclic iminoborane. Photochemical irradiation (lambda > 550 nm) of 4c rather causes an efficient reaction with molecular nitrogen, lying in matrix sites nearby, to give 6c. Similarly, photochemical, but not thermal, trapping of 4c with CO is possible and results in the corresponding isocycanate 9c. Thermal reaction of 4c with O(2) in doped argon matrixes at 35 K could be observed by IR spectroscopy to result in borylnitroso-O-oxide 17c as shown by (18)O(2) labeling experiments and DFT computations. The diradical 17c is very photolabile and quickly rearranges to the nitritoborane 16c upon irradiation.
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Affiliation(s)
- Holger F Bettinger
- Lehrstuhl für Organische Chemie II, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum, Germany.
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Pritchina EA, Gritsan NP, Bally T. Matrix isolation and computational study of the photochemistry of p-azidoaniline. Phys Chem Chem Phys 2005; 8:719-27. [PMID: 16482312 DOI: 10.1039/b511229j] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photochemistry of p-azidoaniline was studied in argon matrices in the absence and presence of oxygen. With the help of quantum chemical calculations we were able to characterize the triplet p-aminophenylnitrene as well as the cis- and trans-p-aminophenylnitroso oxides. It was found that the latter two isomers can be interconverted by selective irradiation and that they are ultimately converted into p-nitroaniline. Although restricted wavefunctions of the nitroso oxides are unstable, CASSCF calculations turned up no evidence for the claimed diradical character of these compounds. Also we found no evidence for dioxaziridines as intermediates of the conversion of the nitroso oxides to p-nitroaniline.
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Affiliation(s)
- Elena A Pritchina
- Institute of Chemical Kinetics and Combustion, Siberian Branch of Russian Academy of Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
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Inui H, Irisawa M, Oishi S. Reaction of (4-Nitorophenyl)nitrene with Molecular Oxygen in Low-temperature Matrices: First IR Detection and Photochemistry of Aryl Nitroso Oxide. CHEM LETT 2005. [DOI: 10.1246/cl.2005.478] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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21
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Himmel HJ, Junker M, Schnöckel H. On the reactivity of NH formed from photoinduced decomposition of HN3 in an Ar matrix at 12 K toward N2 and CO: A combined matrix isolation and quantum chemical study. J Chem Phys 2002. [DOI: 10.1063/1.1492276] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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22
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Laursen SL, Delia AE, Mitchell K. Reaction of NH (X 3Σ-) with NO in Xenon Matrix: Infrared Detection of the HNNO Intermediate. J Phys Chem A 2000. [DOI: 10.1021/jp993854i] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sandra L. Laursen
- Department of Chemistry, Kalamazoo College, Kalamazoo, Michigan 49006
| | - Alice E. Delia
- Department of Chemistry, Kalamazoo College, Kalamazoo, Michigan 49006
| | - Kwasi Mitchell
- Department of Chemistry, Kalamazoo College, Kalamazoo, Michigan 49006
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