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Structural determination of a transient isomer of CH2I2 by picosecond x-ray diffraction

Jan Davidsson ; Jens Aage Poulsen ; Marco Cammarata ; Panos Georgiou ; Remco Wouts ; Gergely Katona ; Frida Jacobson (Institutionen för kemi- och bioteknik, Molekylär bioteknik) ; Anton Plech ; Michael Wulff ; Gunnar Nyman ; Richard Neutze (Institutionen för kemi- och bioteknik, Molekylär bioteknik ; Institutionen för kemi)
Physical Review Letters Vol. 94 (2005), 24, p. 4.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: RESONANCE RAMAN OBSERVATION, SOLUTION-PHASE, ALKYL-HALIDES, PHOTODISSOCIATION DYNAMICS, ULTRAVIOLET PHOTOLYSIS, ORGANIC TRACES, DIIODOMETHANE, CYCLOPROPANATION, PHOTOCHEMISTRY, PHOTOPRODUCT



Denna post skapades 2007-10-24. Senast ändrad 2012-08-20.
CPL Pubid: 56990

 

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Institutioner (Chalmers)

Institutionen för kemi (2001-2011)
Institutionen för kemi- och bioteknik, Molekylär bioteknik (2005-2007)

Ämnesområden

Fysikalisk kemi

Chalmers infrastruktur