Organic Chemistry: SN2: Simple Reaction, Methylbromide + Chloride ion

first frame play reverse -1 play reverse stop play forward play forward +1 last frame    loop
CH3Cl + Br-

All these geometries were theoretically found at the DFT-B3LYP level of theory (6-31G(d,p) basis sets for light atoms and Stuttgart ECPs for the heaviest ones). Solvation effects by acetone are modeled with PCM

More information about SN2 reactions on Wikipedia