Imaging Proton Transfer and Dihalide Formation Pathways in Reactions of F(-) + CH3I

The Journal of Physical Chemistry. a
Eduardo CarrascosaRoland Wester

Abstract

Ion-molecule reactions of the type X(-) + CH3Y are commonly assumed to produce Y(-) through bimolecular nucleophilic substitution (SN2). Beyond this reaction, additional reaction products have been observed throughout the last decades and have been ascribed to different entrance channel geometries differing from the commonly assumed collinear approach. We have performed a crossed beam velocity map imaging experiment on the F(-) + CH3I reaction at different relative collision energies between 0.4 and 2.9 eV. We find three additional channels competing with nucleophilic substitution at high energies. Experimental branching ratios and angle- and energy differential cross sections are presented for each product channel. The proton transfer product CH2I(-) is the main reaction channel, which competes with nucleophilic substitution up to 2.9 eV relative collision energy. At this level, the second additional channel, the formation of IF(-) via halogen abstraction, becomes more efficient. In addition, we present the first evidence for an [FHI](-) product ion. This [FHI](-) product ion is present only for a narrow range of collision energies, indicating possible dissociation at high energies. All three products show a similar trend with...Continue Reading

References

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Citations

Jul 21, 2017·Physical Chemistry Chemical Physics : PCCP·Yong-Tao MaWilliam L Hase
Nov 15, 2017·Chemical Society Reviews·Eduardo CarrascosaRoland Wester
Apr 23, 2020·Physical Chemistry Chemical Physics : PCCP·Tim MichaelsenRoland Wester
May 27, 2020·Physical Chemistry Chemical Physics : PCCP·Yan LiDunyou Wang
Jun 24, 2017·Nature Communications·Eduardo CarrascosaRoland Wester
May 4, 2017·Annual Review of Physical Chemistry·Jennifer Meyer, Roland Wester
Jul 10, 2018·Science Advances·Martin SteiRoland Wester
Feb 16, 2021·Physical Chemistry Chemical Physics : PCCP·Xiaoyan JiJing Xie
Jun 2, 2021·Mass Spectrometry Reviews·Roland Wester
Nov 18, 2018·The Journal of Physical Chemistry. a·Xu LiuJianmin Sun
Feb 13, 2020·The Journal of Physical Chemistry. a·Björn BastianRoland Wester
Jun 19, 2018·The Journal of Physical Chemistry. a·Lopamudra SatpathyBijay K Mishra
May 10, 2020·The Journal of Physical Chemistry Letters·Tim MichaelsenRoland Wester

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