Berlin 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MO: Fachverband Molekülphysik
MO 15: Experimental Techniques 3
MO 15.7: Vortrag
Donnerstag, 20. März 2014, 12:00–12:15, BEBEL SR144
Direct imaging of SN2 pathways in the reaction F− + CH3Cl — •Eduardo Carrascosa, Aditya Kelkar, Martin Stei, Thorsten Best, and Roland Wester — Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria
Halogenated hydrocarbons play a very important role in organic synthesis both as solvents and as reaction intermediates. The bimolecular nucleophilic substitution (SN2) is one of the most common reactions of these compounds. Using a crossed beam setup and a velocity map imaging spectrometer our group has extensively studied exothermic SN2 reaction systems [1]. The present study focuses on the dynamics of the reaction between fluorine anions, F−, and methyl chloride, CH3Cl.
In this presentation velocity distributions of the product Cl− ion at different relative collision energies ranging from 0.6 eV to 2.5 eV will be shown. The direct SN2 pathway is the dominant channel at high energies, with an increasingly strong contribution from the complex mediated channel at lower energies. The experimental results will be compared with recent theoretical calculations on this system[2,3]. Moreover, a comparison with previous studies by our group on similar systems like Cl− + CH3I and F− + CH3I [4], will provide a better understanding of the dynamical factors in SN2 reactions.
R. Wester, PCCP, 16, 396 (2014) [2] A.P. Bento and F.M. Bickelhaupt, J. Org. Chem., 73 (18), 7290 (2008) [3] M. Mugnai et al., J. Chem. Phys.,118, 2767 (2003) [4] J. Mikosch et al., J. Am. Chem. Soc.,135, 4250 (2013)