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

Published inThe journal of physical chemistry. A, vol. 110, no. 22, p. 7028-7034
Publication date2006
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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Citation (ISO format)
LANG, Bernhard Felix, ANGULO, Gonzalo, VAUTHEY, Eric. Ultrafast Solvation Dynamics of Coumarin 153 in Imidazolium-Based Ionic Liquids. In: The journal of physical chemistry. A, 2006, vol. 110, n° 22, p. 7028–7034. doi: 10.1021/jp057482r
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ISSN of the journal1089-5639
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