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Qin Y, Lu B, Rauhut G, Hagedorn M, Banert K, Song C, Chu X, Wang L, Zeng X. The Simplest, Isolable, Alkynyl Isocyanate HC≡CNCO: Synthesis and Characterization. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201911102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yuanyuan Qin
- College of ChemistryChemical Engineering and Materials ScienceSoochow University Suzhou 215123 China
| | - Bo Lu
- College of ChemistryChemical Engineering and Materials ScienceSoochow University Suzhou 215123 China
| | - Guntram Rauhut
- Institute for Theoretical ChemistryUniversity of Stuttgart Pfaffenwaldring 55 Stuttgart 70569 Germany
| | - Manfred Hagedorn
- Chemnitz University of TechnologyOrganic Chemistry Strasse der Nationen 62 Chemnitz 09111 Germany
| | - Klaus Banert
- Chemnitz University of TechnologyOrganic Chemistry Strasse der Nationen 62 Chemnitz 09111 Germany
| | - Chao Song
- College of ChemistryChemical Engineering and Materials ScienceSoochow University Suzhou 215123 China
| | - Xianxu Chu
- College of ChemistryChemical Engineering and Materials ScienceSoochow University Suzhou 215123 China
| | - Lina Wang
- Department of ChemistryFudan University Shanghai 200433 China
| | - Xiaoqing Zeng
- College of ChemistryChemical Engineering and Materials ScienceSoochow University Suzhou 215123 China
- Department of ChemistryFudan University Shanghai 200433 China
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Qin Y, Lu B, Rauhut G, Hagedorn M, Banert K, Song C, Chu X, Wang L, Zeng X. The Simplest, Isolable, Alkynyl Isocyanate HC≡CNCO: Synthesis and Characterization. Angew Chem Int Ed Engl 2019; 58:17277-17281. [PMID: 31553514 DOI: 10.1002/anie.201911102] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Indexed: 11/08/2022]
Abstract
Alkynyl isocyanates have been postulated as highly reactive intermediates in synthetic chemistry. Herein, the parent molecule HC≡CNCO is isolated for the first time. In sharp contrast to the previously reported short lifetime (ca. 15 s) at room temperature, we found that HC≡CNCO has a lifetime of 55 h in the gas phase (2 mbar, 300 K) with a melting point of -79.5 °C and vaporization enthalpy (ΔHvap ) of 23.1(1) kJ mol-1 . Apart from the IR (gas, solid, and matrix), 1 H and 13 C NMR, and UV/Vis spectroscopic characterization, its photoisomerization with a acylnitrene HC≡CC(O)N and cyanoketene NCC(H)CO has been observed.
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Affiliation(s)
- Yuanyuan Qin
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Bo Lu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Guntram Rauhut
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, Stuttgart, 70569, Germany
| | - Manfred Hagedorn
- Chemnitz University of Technology, Organic Chemistry, Strasse der Nationen 62, Chemnitz, 09111, Germany
| | - Klaus Banert
- Chemnitz University of Technology, Organic Chemistry, Strasse der Nationen 62, Chemnitz, 09111, Germany
| | - Chao Song
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Xianxu Chu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Lina Wang
- Department of Chemistry, Fudan University, Shanghai, 200433, China
| | - Xiaoqing Zeng
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China.,Department of Chemistry, Fudan University, Shanghai, 200433, China
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Nuñez-Reyes D, Loison JC, Hickson KM, Dobrijevic M. Rate constants for the N(2D) + C2H2 reaction over the 50–296 K temperature range. Phys Chem Chem Phys 2019; 21:22230-22237. [DOI: 10.1039/c9cp04170b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactions of metastable atomic nitrogen N(2D) are important processes in the gas-phase chemistry of several planetary atmospheres.
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Affiliation(s)
- Dianailys Nuñez-Reyes
- Université de Bordeaux
- Institut des Sciences Moléculaires
- UMR 5255
- F-33400 Talence
- France
| | | | - Kevin M. Hickson
- Université de Bordeaux
- Institut des Sciences Moléculaires
- UMR 5255
- F-33400 Talence
- France
| | - Michel Dobrijevic
- Laboratoire d'Astrophysique de Bordeaux
- Université de Bordeaux
- CNRS
- F-33615 Pessac
- France
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Bassett MK, Fortenberry RC. Symmetry breaking and spectral considerations of the surprisingly floppy c-C 3H radical and the related dipole-bound excited state of c-C 3H . J Chem Phys 2017; 146:224303. [PMID: 29166048 DOI: 10.1063/1.4985095] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The C3H radical is believed to be prevalent throughout the interstellar medium and may be involved in the formation of polycyclic aromatic hydrocarbons. C3H exists as both a linear and a cyclic isomer. The C2v cyclopropenylidenyl radical isomer was detected in the dark molecular cloud TMC-1, and the linear propenylidenyl radical isomer has been observed in various dark molecular clouds. Even though the c-C3H radical has been classified rotationally, the vibrational frequencies of this seemingly important interstellar molecule have never been directly observed. Established, highly accurate quartic force field methodologies are employed here to compute useful geometrical data, spectroscopic constants, and vibrational frequencies. The computed rotational constants are consistent with the experimental results. Consequently, the three a1 (ν1, ν2, and ν3) and one b1 (ν6) anharmonic vibrational frequencies at 3117.7 cm-1, 1564.3 cm-1, 1198.5 cm-1, and 826.7 cm-1, respectively, are reliable predictions for these, as of yet unseen, observables. Unfortunately, the two b2 fundamentals (ν4 and ν5) cannot be treated adequately in the current approach due to a flat and possible double-well potential described in detail herein. The dipole-bound excited state of the anion suffers from the same issues and may not even be bound. However, the trusted fundamental vibrational frequencies described for the neutral radical should not be affected by this deformity and are the first robustly produced for c-C3H. The insights gained here will also be applicable to other structures containing three-membered bare and exposed carbon rings that are surprisingly floppy in nature.
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Affiliation(s)
- Matthew K Bassett
- Department of Chemistry and Biochemistry, Georgia Southern University, Statesboro, Georgia 30460, USA
| | - Ryan C Fortenberry
- Department of Chemistry and Biochemistry, Georgia Southern University, Statesboro, Georgia 30460, USA
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