Abstract
The mechanism, kinetics and thermochemistry of the gas-phase reactions between CHF(2)OCHF(2) (HFE-134) and OH radical are investigated using the high level ab initio G2(MP2) and hybrid density functional model MPWB1K quantum chemical methods. Two relatively close in energy conformers are found for CHF(2)OCHF(2) molecule; both of them are likely to be important in the temperature range (250-1000K) of our study. The hydrogen abstraction pathway for both the conformers with OH radical is studied and the rate constants are determined for the first time in a wide temperature range of 250 - 1000K. The G2(MP2) calculated total rate constant value of 2.9 × 10(-15)cm(3)molecule(-1)s(-1) at 298K is found to be in very good agreement with the reported experimental value of 2.4 × 10(-15)cm(3)molecule(-1)s(-1) at 298K. The heats of reaction for CHF(2)OCHF(2) + OH reaction is computed to be -13.2kcalmol(-1). The atmospheric lifetime of CHF(2)OCHF(2) is expected to be around 12years.
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