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Photodissociation Dynamics of Iodoform in Solution.

Wall, Magnus LU ; Tarnovsky, Alexander LU ; Pascher, Torbjörn LU ; Sundström, Villy LU and Åkesson, Eva LU (2003) In The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory 107(2). p.211-217
Abstract
The photodissociation dynamics of iodoform (CHI3) in acetonitrile and cyclohexane were investigated by femtosecond pump-probe spectroscopy and nanosecond laser flash photolysis. We have measured transient absorption spectra in the spectral region of 370-730 nm and kinetics at selected wavelengths on a femtosecond-microsecond time scale. We assign the observed photoproduct with absorption maxima at 450 and 600 nm, formed upon excitation of iodoform at 350 nm in acetonitrile and cyclohexane, to the isomer of iodoform, iso-iodoform (CHI2-I). The iso-iodoform is most probably formed via an in-cage recombination of the produced photofragments, the I atom and the CHI2 radical, with an ~7 ps time constant. The lifetime of the iso-iodoform is... (More)
The photodissociation dynamics of iodoform (CHI3) in acetonitrile and cyclohexane were investigated by femtosecond pump-probe spectroscopy and nanosecond laser flash photolysis. We have measured transient absorption spectra in the spectral region of 370-730 nm and kinetics at selected wavelengths on a femtosecond-microsecond time scale. We assign the observed photoproduct with absorption maxima at 450 and 600 nm, formed upon excitation of iodoform at 350 nm in acetonitrile and cyclohexane, to the isomer of iodoform, iso-iodoform (CHI2-I). The iso-iodoform is most probably formed via an in-cage recombination of the produced photofragments, the I atom and the CHI2 radical, with an ~7 ps time constant. The lifetime of the iso-iodoform is found to be ~1.8 and 0.2 s in cyclohexane and acetonitrile, respectively. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory
volume
107
issue
2
pages
211 - 217
publisher
The American Chemical Society
external identifiers
  • wos:000180410500001
  • scopus:0037448472
ISSN
1520-5215
DOI
10.1021/jp0213856
language
English
LU publication?
yes
id
17af0491-5886-4a09-ad5f-6934f32f23c1 (old id 128228)
date added to LUP
2007-07-04 08:44:38
date last changed
2018-05-29 09:29:32
@article{17af0491-5886-4a09-ad5f-6934f32f23c1,
  abstract     = {The photodissociation dynamics of iodoform (CHI3) in acetonitrile and cyclohexane were investigated by femtosecond pump-probe spectroscopy and nanosecond laser flash photolysis. We have measured transient absorption spectra in the spectral region of 370-730 nm and kinetics at selected wavelengths on a femtosecond-microsecond time scale. We assign the observed photoproduct with absorption maxima at 450 and 600 nm, formed upon excitation of iodoform at 350 nm in acetonitrile and cyclohexane, to the isomer of iodoform, iso-iodoform (CHI2-I). The iso-iodoform is most probably formed via an in-cage recombination of the produced photofragments, the I atom and the CHI2 radical, with an ~7 ps time constant. The lifetime of the iso-iodoform is found to be ~1.8 and 0.2 s in cyclohexane and acetonitrile, respectively.},
  author       = {Wall, Magnus and Tarnovsky, Alexander and Pascher, Torbjörn and Sundström, Villy and Åkesson, Eva},
  issn         = {1520-5215},
  language     = {eng},
  number       = {2},
  pages        = {211--217},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory},
  title        = {Photodissociation Dynamics of Iodoform in Solution.},
  url          = {http://dx.doi.org/10.1021/jp0213856},
  volume       = {107},
  year         = {2003},
}