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Chin. Phys. B, 2018, Vol. 27(3): 033401    DOI: 10.1088/1674-1056/27/3/033401

Solvent effects and potential of mean force study of the SN2 reaction of CH3F+CN- in water

Chen Li(李琛), Peng Liu(刘鹏), Yongfang Li(李永方), Dunyou Wang(王敦友)
College of Physics and Electronics, Shandong Normal University, Jinan 250014, China

We used a combined quantum mechanics and molecular mechanics (QM/MM) method to investigate the solvent effects and potential of mean force of the CH3F+CN- reaction in water. Comparing to gas phase, the water solution substantially affects the structures of the stationary points along the reaction path. We quantitatively obtained the solvent effects' contributions to the reaction:1.7 kcal/mol to the activation barrier and -26.0 kcal/mol to the reaction free energy. The potential mean of force calculated with the density functional theory/MM theory has a barrier height at 19.7 kcal/mol, consistent with the experimental result at 23.0 kcal/mol; the calculated reaction free energy at -43.5 kcal/mol is also consistent with the one estimated based on the gas-phase data at -39.7 kcal/mol.

Keywords:  transition state      quantum mechanics and molecular mechanics      solvent effect      potential of mean force  
Received:  16 October 2017      Revised:  04 December 2017      Published:  05 March 2018
PACS:  34.20.-b (Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions)  
  34.20.Cf (Interatomic potentials and forces)  
  34.20.Gj (Intermolecular and atom-molecule potentials and forces)  
  34.50.Lf (Chemical reactions)  

Project supported by the National Natural Science Foundation of China (Grant No. 11774206) and Taishan Scholarship Fund from Shandong Province, China.

Corresponding Authors:  Dunyou Wang     E-mail:

Cite this article: 

Chen Li(李琛), Peng Liu(刘鹏), Yongfang Li(李永方), Dunyou Wang(王敦友) Solvent effects and potential of mean force study of the SN2 reaction of CH3F+CN- in water 2018 Chin. Phys. B 27 033401

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