Photodissociation Dynamics of Iodoform in Solution.

Magnus Wall; Alexander Tarnovsky; Torbjörn Pascher; Villy Sundström; Eva Åkesson

doi:10.1021/jp0213856

Photodissociation Dynamics of Iodoform in Solution.

Magnus Wall, Alexander Tarnovsky, Torbjörn Pascher, Villy Sundström, Eva Åkesson

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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.

Originalspråk	engelska
Sidor (från-till)	211-217
Tidskrift	The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory
Volym	107
Nummer	2
DOI	https://doi.org/10.1021/jp0213856
Status	Published - 2003

Bibliografisk information

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Chemical Physics (S) (011001060)

Ämnesklassifikation (UKÄ)

Atom- och molekylfysik och optik

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10.1021/jp0213856

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title = "Photodissociation Dynamics of Iodoform in Solution.",

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 = "Magnus Wall and Alexander Tarnovsky and Torbj{\"o}rn Pascher and Villy Sundstr{\"o}m and Eva {\AA}kesson",

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AU - Tarnovsky, Alexander

AU - Pascher, Torbjörn

AU - Sundström, Villy

AU - Åkesson, Eva

N1 - The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)

PY - 2003

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N2 - 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.

AB - 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.

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JF - The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory

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ER -

Photodissociation Dynamics of Iodoform in Solution.

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