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Issue 13, 2017
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Probe dependence on polar solvation dynamics from fs broadband fluorescence

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Abstract

Polar solvation dynamics of six 7-aminocoumarins and 4-aminophthalimide (4AP) are investigated using broadband FLuorescence UP-conversion Spectroscopy (FLUPS) combined with a global analysis based on time-dependent band-shape functions. The solvation dynamics of the coumarins in ethanol exhibit only minor differences but are, however, significantly different from that of 4AP. The band-shape parameters, width and asymmetry, exhibit much larger variation even among the coumarins and are correlated with the amount of excess excitation energy. Differences in the solvation dynamics of 4AP and a selected coumarin, C151, are also observed in dimethyl sulfoxide demonstrating the molecularity of solvation i.e. solvation depends on the solute and does not solely reflect the dynamic properties of the solvent. These differences are attributed to specific solute–solvent interactions due to hydrogen bonding. In a weakly interacting solvent, benzonitrile, the solvation dynamics of 4AP and C151 are nearly identical.

Graphical abstract: Probe dependence on polar solvation dynamics from fs broadband fluorescence

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Supplementary files

Article information


Submitted
01 Feb 2017
Accepted
02 Mar 2017
First published
07 Mar 2017

Phys. Chem. Chem. Phys., 2017,19, 8815-8825
Article type
Paper

Probe dependence on polar solvation dynamics from fs broadband fluorescence

T. Kumpulainen, A. Rosspeintner and E. Vauthey, Phys. Chem. Chem. Phys., 2017, 19, 8815
DOI: 10.1039/C7CP00706J

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