We report 29 stationary points for the F - (H 2 O) + CH 3 I reaction obtained by using the high-level explicitly correlated CCSD(T)-F12b method with the aug-cc-pVDZ basis set for the determination of the benchmark structures and frequencies and the aug-cc-pVQZ basis for energy computations. The stationary points characterize the monohydrated F - - and OH - -induced Walden-inversion pathways and, for the first time, the front-side attack and F - -induced double-inversion mechanisms leading to CH 3 F with retention as well as the novel H 2 O-induced double-inversion retention pathway producing CH 3 OH. Hydration effectively increases the relative energies of the stationary points, but the monohydrated inversion pathways are still barrierless, whereas the front-side attack and double-inversion barrier heights are around 30 and 20 kcal/mol, respectively.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry