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Dynamic Polar Solvation Is Reported by Fluorescing 4-Aminophthalimide Faithfully Despite H-Bonding

Sajadi, Mohsen ; Obernhuber, Thorsten ; Kovalenko, Sergey A. ; Mosquera, Manuel ; Dick, Bernhard ; Ernsting, Nikolaus P.


Solvation dynamics of 4-aminophthalimide (4AP) in methanol is measured by broadband upconversion of the fluorescence band. The peak emission frequency n(t) is detd. from 100 fs onward with 85 fs time resoln. Polar solvation based on simple continuum theory, including solute polarizability, describes the temporal shape of n(t) quant. Extrapolation n(t->0) points to an initial emission frequency ...


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