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 134307Subject Categories
Physical Chemistry
Atom and Molecular Physics and Optics
Organic Chemistry
DOI
10.1063/1.5005595
PubMed
29626862