Solvation dynamics and rotation of coumarin 153 in a new ionic liquid/molecular solvent mixture model: [BMIM][TFSI]/propylene carbonate - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Molecular Liquids Année : 2017

Solvation dynamics and rotation of coumarin 153 in a new ionic liquid/molecular solvent mixture model: [BMIM][TFSI]/propylene carbonate

Résumé

Using picosecond time-correlated single photon counting (TCSPC) technique, C-153 fluorescent probe solvation and orientational dynamics in [BMIM][TFSI]/PC mixtures have been investigated. The bi-exponential fit of the solvation response gives tens and hundreds of picoseconds time-components, respectively. Both components are dependent on mixture composition. A characteristic power-law relation between integral solvation times and mixture viscosity has been extracted. As the solvation dynamics is controlled by translational motion, we chose to confront integral solvation times 〈τsolv〉 of C-153 in [BMIM][TFSI]/PC with the translational diffusion coefficients of BMIM+ cations and propylene carbonate molecules, as well as with average rotational times 〈τrot〉, obtained measuring time-resolved fluorescence anisotropy. Our results allow to make the hypothesis that the solvation dynamics of C-153 in this mixture is mainly influenced by the cation.
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Dates et versions

hal-01459096 , version 1 (07-02-2017)

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Y. Smortsova, F.A. Miannay, H. Oher, B. Marekha, J. Dubois, et al.. Solvation dynamics and rotation of coumarin 153 in a new ionic liquid/molecular solvent mixture model: [BMIM][TFSI]/propylene carbonate. Journal of Molecular Liquids, 2017, 226, pp.48 - 55. ⟨10.1016/j.molliq.2016.10.008⟩. ⟨hal-01459096⟩
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