Temperature-Dependence of the Rates of Reaction of Trifluoroacetic Acid with Criegee Intermediates.
Temperature-Dependence of the Rates of Reaction of Trifluoroacetic Acid with Criegee Intermediates.
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三氟乙酸与Criegee中间体反应速率的温度依赖性。
DOI:
10.1002/anie.201703700
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发表时间:
2017-07-24
期刊:
影响因子:
--
通讯作者:
Orr-Ewing AJ
中科院分区:
文献类型:
--
作者:
Chhantyal-Pun R;McGillen MR;Beames JM;Khan MAH;Percival CJ;Shallcross DE;Orr-Ewing AJ
The rate coefficients for gas‐phase reaction of trifluoroacetic acid (TFA) with two Criegee intermediates, formaldehyde oxide and acetone oxide, decrease with increasing temperature in the range 240–340 K. The rate coefficients k(CH2OO + CF3COOH)=(3.4±0.3)×10−10 cm3 s−1 and k((CH3)2COO + CF3COOH)=(6.1±0.2)×10−10 cm3 s−1 at 294 K exceed estimates for collision‐limited values, suggesting rate enhancement by capture mechanisms because of the large permanent dipole moments of the two reactants. The observed temperature dependence is attributed to competitive stabilization of a pre‐reactive complex. Fits to a model incorporating this complex formation give k [cm3 s−1]=(3.8±2.6)×10−18 T2 exp((1620±180)/T) + 2.5×10−10 and k [cm3 s−1]=(4.9±4.1)×10−18 T2 exp((1620±230)/T) + 5.2×10−10 for the CH2OO + CF3COOH and (CH3)2COO + CF3COOH reactions, respectively. The consequences are explored for removal of TFA from the atmosphere by reaction with biogenic Criegee intermediates.
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影响因子:
16.6
作者:
Welz, Oliver;Eskola, Arkke J.;Sheps, Leonid;Rotavera, Brandon;Savee, John D.;Scheer, Adam M.;Osborn, David L.;Lowe, Douglas;Booth, A. Murray;Xiao, Ping;Khan, M. Anwar H.;Percival, Carl J.;Shallcross, Dudley E.;Taatjes, Craig A.
通讯作者:
Taatjes, Craig A.
影响因子:
4.4
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通讯作者:
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2.9
作者:
Hurley, MD;Andersen, MPS;Mabury, SA
通讯作者:
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影响因子:
3.3
作者:
Liu, Fang;Fang, Yi;Lester, Marsha I.
通讯作者:
Lester, Marsha I.
影响因子:
2.8
作者:
Zhang, D;Lei, WF;Zhang, RY
通讯作者:
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