Ultrafast measurements of the dynamics of solvation in polar and non-dipolar solvents

J. Gardecki, M. L. Horng, A. Papazyan, Mark Maroncelli

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Abstract

The dynamics of solvation of the probe solute coumarin 153 has been measured with ~100 fs time resolution using the fluorescence upconversion technique. A wide variety of solvents, including polar aprotic solvents, hydrogen bonding solvents, and non-dipolar solvents have been examined. For all solvents of even moderate polarity (49-01), the solvation dynamics observed follows the predictions simple models based on the solvent's bulk dielectric response. For a number of “non-dipolar” solvents such as dioxane and benzene, for which (49-02), we observe surprisingly large time-dependent shifts, which seem to reflect the solute interacting with the large quadrupole (and higher multipole) moments of the solvent molecules. These dynamics represent a solvation distinct from the dipolar solvation dynamics previously studied and they cannot be modeled in terms of any currently available theory.

Original languageEnglish (US)
Pages (from-to)49-57
Number of pages9
JournalStudies in Physical and Theoretical Chemistry
Volume83
Issue numberC
DOIs
Publication statusPublished - Jan 1 1995

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All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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