Structural determination of a transient isomer of CH2I2 by picosecond x-ray diffraction
Artikel i vetenskaplig tidskrift, 2005

Ultrafast time-resolved spectroscopic studies of complex chemical reactions in solution are frequently hindered by difficulties in recovering accurate structural models for transient photochemical species. Time-resolved x-ray and electron diffraction have recently emerged as techniques for probing the structural dynamics of short lived photointermediates. Here we determine the structure of a transient isomer of photoexcited CH2I2 in solution and observe the downstream reactions of the initial photoproducts. Our results illustrate how geminate recombination proceeds via the formation of a transient covalent bond onto the iodine atom remaining with the parent molecule. Further intramolecular rearrangements are thus required for the CH2I-I isomer to return to CH2I2. The generation of I-3(-) from those iodine radicals escaping the solvent cage is also followed with time.

RESONANCE RAMAN OBSERVATION

ALKYL-HALIDES

PHOTOCHEMISTRY

SOLUTION-PHASE

PHOTODISSOCIATION DYNAMICS

ORGANIC TRACES

PHOTOPRODUCT

CYCLOPROPANATION

ULTRAVIOLET PHOTOLYSIS

DIIODOMETHANE

Författare

J Davidsson

Jens Aage Poulsen

Göteborgs universitet

Marco Cammarata

Panos Georgiou

Remco Wouts

Gergely Katona

Frida Jacobson

Chalmers, Kemi- och bioteknik, Molekylär bioteknik

Anton Plech

Michael Wulff

Gunnar Nyman

Göteborgs universitet

Richard Neutze

Chalmers, Kemi- och bioteknik, Molekylär bioteknik

Göteborgs universitet

Physical Review Letters

Vol. 94 24 4-

Ämneskategorier

Fysikalisk kemi

DOI

10.1103/PhysRevLett.94.245503