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Liu Y, Wang G, Zhao Y. Direct observation on argon tagging nitrobenzene radical anion in gas phase: Infrared photodissociation spectroscopy and theoretical calculation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 294:122482. [PMID: 36841135 DOI: 10.1016/j.saa.2023.122482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 01/26/2023] [Accepted: 02/08/2023] [Indexed: 06/18/2023]
Abstract
The infrared photodissociation spectroscopy was applied to characterize nitrobenzene radical anion (NB-). NB- tagged by argon [NB(Ar)-] was prepared by a mixture of nitrobenzene/Ar through a supersonic ion source and then selected by a time-of-flight mass spectrometer. Eight strong peaks observed at 977.9, 999.6, 1059.8, 1275.7, 1309.7, 1339.7, 1367.6 and 1581.7 cm-1 in the fingerprint region were assigned to NB(Ar)-, corresponding to CC bending, CC stretching, CC bending + symmetric O-N stretching vibration, antisymmetric O-N and CC stretching vibration, antisymmetric O-N stretching and CH rocking vibration, CC stretching + antisymmetric O-N stretching vibration, C-N stretching vibration, and symmetric CC stretching vibration. Most interestingly, the distinguishable CH stretching vibrations were observed at 3006.5, 3048.6 and 3084.5 cm-1 absorptions. Combined with density functional theoretical (DFT) calculation, five tagging argon NB- isomers were optimized and analyzed with no imaginary frequency. The results indicated that most bond lengths in NB- become longer than those of neutral NB, except for the C1-C2/C4-C5 bonds, which are only slightly shorter than those of neutral NB, and the C-N bond, which is 0.085 A shorter in the anion. The NB- tagged by argon located on the nitro group had no change on bond parameters with Ar-tagging or not theoretically. Natural population analysis (NPA) show that the negative natural charges are mainly distributed on both oxygen atoms. And the one electron resonates between the nitro group and benzene ring. N-O bonds in NB- become much more polar than those of the neutral NB. This paper proved the usefulness to characterize NB(Ar)- and further explore the structures of NBn- (n > 1) clusters by infrared photodissociation spectroscopy combining with the time-of-flight mass spectrometer.
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Affiliation(s)
- Yanhui Liu
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Guanjun Wang
- Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China.
| | - Yanying Zhao
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China; Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China.
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A quantum chemical study of the mechanism of thermal decomposition of N′-methoxy-N-methyldiazene N-oxide. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3688-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
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Wiik K, Høyvik IM, Unneberg E, Jensen TL, Swang O. Unimolecular Decomposition Reactions of Picric Acid and Its Methylated Derivatives─A DFT Study. J Phys Chem A 2022; 126:2645-2657. [PMID: 35472276 PMCID: PMC9082609 DOI: 10.1021/acs.jpca.1c10770] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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To handle energetic
materials safely, it is important to have knowledge
about their sensitivity. Density functional theory (DFT) has proven
a valuable tool in the study of energetic materials, and in the current
work, DFT is employed to study the thermal unimolecular decomposition
of 2,4,6-trinitrophenol (picric acid, PA), 3-methyl-2,4,6-trinitrophenol
(methyl picric acid, mPA), and 3,5-dimethyl-2,4,6-trinitrophenol (dimethyl
picric acid, dmPA). These compounds have similar molecular structures,
but according to the literature, mPA is far less sensitive to impact
than the other two compounds. Three pathways believed important for
the initiation reactions are investigated at 0 and 298.15 K. We compare
the computed energetics of the reaction pathways with the objective
of rationalizing the unexpected sensitivity behavior. Our results
reveal a few if any significant differences in the energetics of the
three molecules, and thus do not reflect the sensitivity deviations
observed in experiments. These findings point toward the potential
importance of crystal structure, crystal morphology, bimolecular reactions,
or combinations thereof on the impact sensitivity of nitroaromatics.
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Affiliation(s)
- Kristine Wiik
- Chemistry Department, The Norwegian University of Science and Technology (NTNU), Høgskoleringen 5, 7491 Trondheim, Norway.,Department of Process Technology, SINTEF Industry, P.O. Box 124 Blindern, 0314 Oslo, Norway
| | - Ida-Marie Høyvik
- Chemistry Department, The Norwegian University of Science and Technology (NTNU), Høgskoleringen 5, 7491 Trondheim, Norway
| | - Erik Unneberg
- Norwegian Defence Research Establishment (FFI), P.O. Box 25, 2027 Kjeller, Norway
| | - Tomas Lunde Jensen
- Norwegian Defence Research Establishment (FFI), P.O. Box 25, 2027 Kjeller, Norway
| | - Ole Swang
- Department of Process Technology, SINTEF Industry, P.O. Box 124 Blindern, 0314 Oslo, Norway
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4
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Wei X, Zang H, Guan Y, Yang C, Muncan J, Li L. Aquaphotomics investigation of the state of water in oral liquid formulation of traditional Chinese medicine and its dynamics during temperature perturbation. NEW J CHEM 2022. [DOI: 10.1039/d2nj03003a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three types of bound water with different hydrogen bonding strengths were identified and elucidated by aquaphotomics.
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Affiliation(s)
- Xiaoying Wei
- NMPA Key Laboratory for Technology Research and Evaluation of Drug Products, School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Hengchang Zang
- NMPA Key Laboratory for Technology Research and Evaluation of Drug Products, School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Yongxia Guan
- State Key Laboratory of Generic Manufacture Technology of Chinese Traditional Medicine, Linyi, Shandong, China
| | - Cui Yang
- NMPA Key Laboratory for Technology Research and Evaluation of Drug Products, School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Jelena Muncan
- Aquaphotomics Research Department, Graduate School of Agricultural Science, Kobe University, Japan
| | - Lian Li
- NMPA Key Laboratory for Technology Research and Evaluation of Drug Products, School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
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Asmis KR, Beele BB, Jenne C, Kawa S, Knorke H, Nierstenhöfer MC, Wang XB, Warneke J, Warneke Z, Yuan Q. Synthesis, Electronic Properties and Reactivity of [B 12 X 11 (NO 2 )] 2- (X=F-I) Dianions. Chemistry 2020; 26:14594-14601. [PMID: 33017100 PMCID: PMC7756457 DOI: 10.1002/chem.202003537] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 08/10/2020] [Indexed: 11/25/2022]
Abstract
Nitro‐functionalized undecahalogenated closo‐dodecaborates [B12X11(NO2)]2− were synthesized in high purities and characterized by NMR, IR, and Raman spectroscopy, single crystal X‐diffraction, mass spectrometry, and gas‐phase ion vibrational spectroscopy. The NO2 substituent leads to an enhanced electronic and electrochemical stability compared to the parent perhalogenated [B12X12]2− (X=F–I) dianions evidenced by photoelectron spectroscopy, cyclic voltammetry, and quantum‐chemical calculations. The stabilizing effect decreases from X=F to X=I. Thermogravimetric measurements of the salts indicate the loss of the nitric oxide radical (NO.). The homolytic NO. elimination from the dianion under very soft collisional excitation in gas‐phase ion experiments results in the formation of the radical [B12X11O]2−.. Theoretical investigations suggest that the loss of NO. proceeds via the rearrangement product [B12X11(ONO)]2−. The O‐bonded nitrosooxy structure is thermodynamically more stable than the N‐bonded nitro structure and its formation by radical recombination of [B12X11O]2−. and NO. is demonstrated.
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Affiliation(s)
- Knut R Asmis
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstr. 2, 04103, Leipzig, Germany
| | - Björn B Beele
- Fakultät für Mathematik und Naturwissenschaften, Anorganische Chemie, Bergische Universität Wuppertal, Gaußstr. 20, 42119, Wuppertal, Germany
| | - Carsten Jenne
- Fakultät für Mathematik und Naturwissenschaften, Anorganische Chemie, Bergische Universität Wuppertal, Gaußstr. 20, 42119, Wuppertal, Germany
| | - Sebastian Kawa
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstr. 2, 04103, Leipzig, Germany
| | - Harald Knorke
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstr. 2, 04103, Leipzig, Germany
| | - Marc C Nierstenhöfer
- Fakultät für Mathematik und Naturwissenschaften, Anorganische Chemie, Bergische Universität Wuppertal, Gaußstr. 20, 42119, Wuppertal, Germany
| | - Xue-Bin Wang
- Physical Sciences Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA, 99352, USA
| | - Jonas Warneke
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstr. 2, 04103, Leipzig, Germany.,Leibniz Institute of Surface Engineering (IOM), Permoserstraße 15, 04318, Leipzig, Germany
| | - Ziyan Warneke
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstr. 2, 04103, Leipzig, Germany
| | - Qinqin Yuan
- Physical Sciences Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA, 99352, USA
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Nikolaeva EV, Egorov DL, Chachkov DV, Shamov AG, Khrapkovskii GM. Transition state structure of the reaction of homolytic dissociation of the C-N bond and competition between dif erent mechanisms of the primary act of gas-phase monomolecular decomposition of nitrobenzene. Russ Chem Bull 2019. [DOI: 10.1007/s11172-019-2585-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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