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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 4
BKCSDE 32(4)
April 20, 2011 
 
Title
 Theoretical Studies on Mechanism and Kinetics of the Hydrogen-Abstraction Reaction of CF3CH2CHO with OH Radicals
Author
 Cheng gang Ci, Hong bo Yu, Su qin Wan, Jing yao Liu, *Chia Chung Sun
Keywords
 Direct dynamics method, Rate constant, Variational transition-state theory, Density functional theory, Reaction mechanism
Abstract
 The hydrogen abstraction reaction of CF3CH2CHO + OH has been studied theoretically by dual-level direct dynamics method. Two stable conformers, trans- and cis-CF3CH2CHO, have been located, and there are four distinct OH hydrogen-abstraction channels from t-CF3CH2CHO and two channels from c-CF3CH2CHO. The required potential energy surface information for the kinetic calculation was obtained at the MCG3-MPWB// M06-2X/aug-cc-pVDZ level. The rate constants, which were calculated using improved canonical transitionstate theory with small-curvature tunneling correction (ICVT/SCT) were fitted by a four-parameter Arrhenius equation. It is shown that the reaction proceeds predominantly via the H-abstraction from the -CHO group over the temperature range 200-2000 K. The calculated rate constants were in good agreement with the experimental data between 263 and 358 K.
Page
 1187 - 1194
Full Text
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