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Cl^- + CH₃Br -->ClCH₃ + Br^- S_N2 Reaction

The following are animations of trajectories for reactants with different amounts and types of energies. The reactant energy includes a relative translational energy, E_rel, between Cl^- + CH₃Br, and a temperature, T_vr, for the CH₃Br vibrational and rotational energies.

Trajectories Animated

Cl^-+ CH₃Br --> ClCH₃ + Br ^-, Nucleophilic substitution by a direct mechanism; E_rel = 50 kcal/mol and T_vr = 300K
Cl^- + CH₃Br --> Cl^----CH₃Br --> ClCH₃Br + Br^-, Nucleophilic substitution by an indirect Reaction, involving the Cl^----CH₃ complex; E_rel = 1.0 kcal/mol and T_vr = 300K
Cl^- + CH₃Br --> Cl^----CH₃Br --> ClCH₃---Br^--->ClCH₃+Br^-, Nucleophilic substitution by an indirect Reaction, involving both Cl^----CH₃Br and ClCH₃---Br^- complex; E_rel = 1.0 kcal/mol and T_vr = 300K
Cl^- + CH₃Br --> Cl^- + CH₃Br, Non-reactive collision; E_rel = 1.0 kcal/mol and T_vr = 300K
Cl^-+CH₃Br --> Cl^----CH₃Br --> Cl^-+CH₃Br Non-reactive collision forming the Cl^----CH₃Br complex which dissociates back to reactants; E_rel = 1.0 kcal/mol and T_vr = 300K
Cl^-+CH₃Br --> Cl^----CH₃Br --> ClCH₃---Br^---> Cl^----CH₃Br --> Cl^-+CH₃Br Nucleophilic substitution by an indirect mechanism involving both the Cl^----CH₃Br and ClCH₃---Br ^- complex and recrossing the transition state separating these complexes; E_rel = 1.0 kcal/mol and T_vr = 300K

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