Imaging Nucleophilic Substitution Dynamics-Reference-Cited by-同舟云学术

Imaging Nucleophilic Substitution Dynamics

Published:2008-01-11 Issue:5860 Volume:319 Page:183-186
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Mikosch J.¹²,Trippel S.¹²,Eichhorn C.¹²,Otto R.¹²,Lourderaj U.¹²,Zhang J. X.¹²,Hase W. L.¹²,Weidemüller M.¹²,Wester R.¹²

Affiliation:

1. Physikalisches Institut, Universität Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg, Germany.

2. Department of Chemistry and Biochemistry, Texas Tech University (TTU), Lubbock, TX 79409, USA.

Abstract

Anion-molecule nucleophilic substitution (S N 2) reactions are known for their rich reaction dynamics, caused by a complex potential energy surface with a submerged barrier and by weak coupling of the relevant rotational-vibrational quantum states. The dynamics of the S N 2 reaction of Cl – + CH 3 I were uncovered in detail by using crossed molecular beam imaging. As a function of the collision energy, the transition from a complex-mediated reaction mechanism to direct backward scattering of the I – product was observed experimentally. Chemical dynamics calculations were performed that explain the observed energy transfer and reveal an indirect roundabout reaction mechanism involving CH 3 rotation.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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