Resumen de Comparative insights into hydrogen abstraction of CCl3H by small oxygen-containing anions MO− with M= BE, B, and AL
Liang Junxi, Zhang Fupeng, Duan Yu, Bai Jun, Su Qiong, Li Zhenhua, Zhang Lili
In the present work, the considered hydrogen abstraction (HAT) reactions of CCl3H molecule driven by three different small anions MO− (M = Be, B, and Al) have been investigated using electronic structure calculations. While full geometry optimizations were operated to locate all of the relevant stationary points using the DFT-BHandHLYP/aug-cc-pVTZ level, the potential-energy profiles were constructed using the coupled-cluster theory with extrapolation to complete basis set CCSD(T)/CBS. Our theoretical findings suggest that the most favored pathway determined for the HAT reactions mainly stems from the MO− type, namely, for facilitating the HAT pathway the B atom is predicted to be an inherent key in the BO−-reaction whereas it becomes O atom in both BeO−- and AlO−-reactions. Of the three favored pathways obtained here, the activations of the CCl3H in the presence of both BeO− and AlO− anions are significantly efficient, in which the energy barrier for the cleavage of the C-H bond with the assistance of BeO− was to be relatively low. Again, through the transition state theory the rate constants at 298-1000 K are also evaluated for the most favored HAT reactions studied here, indicating the lower the temperature, the faster the BO− chemical reaction.
