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Transient isomers in the photodissociation of bromoiodomethane
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Computational Biology and Bioinformatics. CNRS St Gobain, UMR3080, Ceram Synth & Functionalizat Lab, F-84306 Cavaillon, France.;Univ Bourgogne Franche Comte, Inst UTINAM, UMR 6213, CNRS, 16 Route Gray, F-25030 Besancon, France..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
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2018 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 148, no 13, article id 134307Article in journal (Refereed) Published
Abstract [en]

The photochemistry of halomethanes is fascinating for the complex cascade reactions toward either the parent or newly synthesized molecules. Here, we address the structural rearrangement of photodissociated CH2IBr in methanol and cyclohexane, probed by time-resolved X-ray scattering in liquid solution. Upon selective laser cleavage of the C-I bond, we follow the reaction cascade of the two geminate geometrical isomers, CH2I-Br and CH2Br-I. Both meta-stable isomers decay on different time scales, mediated by solvent interaction, toward the original parent molecule. We observe the internal rearrangement of CH2Br-I to CH2I-Br in cyclohexane by extending the time window up to 3 mu s. We track the photoproduct kinetics of CH2Br-I in methanol solution where only one isomer is observed. The effect of the polarity of solvent on the geminate recombination pathways is discussed.

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2018. Vol. 148, no 13, article id 134307
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Physical Chemistry
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URN: urn:nbn:se:uu:diva-352489DOI: 10.1063/1.5005595ISI: 000429359200029PubMedID: 29626862OAI: oai:DiVA.org:uu-352489DiVA, id: diva2:1213661
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research Available from: 2018-06-05 Created: 2018-06-05 Last updated: 2018-06-05Bibliographically approved

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Marcellini, MorenoNasedkin, AlexandrZietz, BurkhardPetersson, JonasVincent, Jonathanvan der Spoel, DavidDavidsson, Jan

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