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Ultrafast Solvation Dynamics of Coumarin 153 in Imidazolium-Based Ionic Liquids

Angulo, Gonzalo
Published in Journal of Physical Chemistry. A. 2006, vol. 110, no. 22, p. 7028-7034
Abstract The dynamic Stokes shift of coumarin 153 has been measured in two room-temperature ionic liquids, 1-(3-cyanopropyl)-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and 1-propyl-3-methylimidazolium tetrafluoroborate, using the fluorescence up-conversion technique with a 230 fs instrumental response function. A component of about 10−15% of the total solvation shift is found to take place on an ultrafast time scale < 10 ps. The amplitude of this component is substantially less than assumed previously by other authors. The origin of the difference in findings could be partly due to chromophore-internal conformational changes on the ultrafast time scale, superimposed to solvation-relaxation, or due to conformational changes of the chromophore ground state in polar and apolar environments. First three-pulse photon-echo peak-shift experiments on indocyanine green in room-temperature ionic liquids and in ethanol indicate a difference in the inertial component of the early solvent relaxation of <100 fs.
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Research group Groupe Vauthey
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LANG, Bernhard Felix, ANGULO, Gonzalo, VAUTHEY, Eric. Ultrafast Solvation Dynamics of Coumarin 153 in Imidazolium-Based Ionic Liquids. In: Journal of Physical Chemistry. A, 2006, vol. 110, n° 22, p. 7028-7034. https://archive-ouverte.unige.ch/unige:3650

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Deposited on : 2009-10-02

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