Reaction Mechanisms of C2Cl3 + NO2 via Nitro and Nitrite Adducts
Liu, Kunhui; Xiang, Tiancheng; Wu, Weiqiang; Zhao, Shaolei; Su, Hongmei
AbstractThe atmospherically and environmentally important reaction of chlorinated vinyl radical with nitrogen dioxide (C2Cl3 + NO2) is investigated by step-scan time-resolved Fourier transform infrared emission spectroscopy and electronic structure calculations. Vibrationally excited products of CO, NO, Cl2CO, and NO2 are observed in the IR emission spectra. Geometries of the major intermediates and transition states alone, the potential energy surface are optimized at the B3LYP/6-311G(d) level, and their energies are refined at the CCSD(T)/6-311+G(d) level. The reaction mechanisms are characterized to be barrierless addition-elimination via nitro (C2Cl3-NO2) and nitrite (C2Cl3-ONO) adducts. Four energetically accessible reaction routes are revealed, i.e., the decomposition of the nitrite adduct forming C2Cl3O + NO and its sequential dissociation to CO + NO + CCl3, the elimination of CINO from the nitrite adduct leading to CINO + Cl2CCO, the Cl-atom shift of the nitrite adduct followed by the decomposition to CCl3CO + NO, and the O-atom shift of the nitro adduct followed by C-C bond cleavage forming ClCNO + Cl2CO. In competition with these reactive fluxes, the back-decomposition of nitro or nitrite adducts leads to the prompt formation of vibrationally excited NO2 and the long-lived reaction adducts facilitate the vibrational energy transfer. Moreover, the product channels and mechanisms of the C2Cl3 + NO2 reaction are compared with the C2H3 + NO2 reaction to explore the effect of chlorine substitution. It is found that the two reactions mainly differ in the initial addition preferentially by the N-attack forming nitro adducts (only N-attack is plausible for the C2H3 + NO2 reaction) or the O-attack forming nitrite adducts (O-attack is slightly more favorable and N-attack is also plausible for the C2Cl3 + NO2 reaction). The addition selectivity can be fundamentally correlated to the variation of the charge density of the end carbon atom of the double bond induced by chlorine substitution due to the electron-withdrawing effect of chlorine groups.
Indexed BySCI
WOS IDWOS:000260357600016
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorSu, Hongmei
AffiliationChinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, BNLMS, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Liu, Kunhui,Xiang, Tiancheng,Wu, Weiqiang,et al. Reaction Mechanisms of C2Cl3 + NO2 via Nitro and Nitrite Adducts[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2008,112(43):10807-10815.
APA Liu, Kunhui,Xiang, Tiancheng,Wu, Weiqiang,Zhao, Shaolei,&Su, Hongmei.(2008).Reaction Mechanisms of C2Cl3 + NO2 via Nitro and Nitrite Adducts.JOURNAL OF PHYSICAL CHEMISTRY A,112(43),10807-10815.
MLA Liu, Kunhui,et al."Reaction Mechanisms of C2Cl3 + NO2 via Nitro and Nitrite Adducts".JOURNAL OF PHYSICAL CHEMISTRY A 112.43(2008):10807-10815.
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