Transient isomers in the photodissociation of bromoiodomethane
Journal article, 2018

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. Published by AIP Publishing.

Author

Moreno Marcellini

Uppsala University

University of Burgundy - Franche-Comté

Centre national de la recherche scientifique (CNRS)

Alexandr Nasedkin

Chalmers, Physics, Biological Physics

Burkhard Zietz

Uppsala University

Jonas Petersson

Uppsala University

Jonathan Vincent

Uppsala University

Federico Palazzetti

University of Perugia

Erik Malmerberg

University of Gothenburg

Qingyu Kong

European Synchrotron Radiation Facility (ESRF)

Argonne National Laboratory

Michael Wulff

European Synchrotron Radiation Facility (ESRF)

David van der Spoel

Uppsala University

Richard Neutze

University of Gothenburg

Jan Davidsson

Uppsala University

Journal of Chemical Physics

0021-9606 (ISSN) 1089-7690 (eISSN)

Vol. 148 13 134307

Subject Categories

Physical Chemistry

Atom and Molecular Physics and Optics

Organic Chemistry

DOI

10.1063/1.5005595

PubMed

29626862

More information

Latest update

6/12/2018