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| Item type: | Article | ||||
|---|---|---|---|---|---|
| Journal or Publication Title: | Journal of Physical Chemistry A | ||||
| Volume: | 113 | ||||
| Number of Issue or Book Chapter: | 1 | ||||
| Page Range: | pp. 44-55 | ||||
| Date: | 2009 | ||||
| Additional Information (public): | CAN 150:34883 22-9 Physical Organic Chemistry 3676-85-5 (4-Aminophthalimide) Role: PEP (Physical, engineering or chemical process), PRP (Properties), PROC (Process) (crystal structure; fluorescence study on solvation dynamics of 4-aminophthalimide in methanol) | ||||
| Institutions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry III - Physical Chemistry (Molecular Spectroscopy and Photochemistry) > Prof. Dr. Bernhard Dick | ||||
| Identification Number: |
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| Keywords: | Crystal structure; Electronic state; Fluorescence; Fluorescence excitation; Fluorescence up-conversion; Hydrogen bond; Molecular structure; Optical double resonance; Oscillator strength; Reorganization energy; Solvation; Solvent polarity effect; UV and visible spectra (fluorescence study on solvation dynamics of 4-aminophthalimide in methanol); solvation dynamics aminophthalimide methanol soln fluorescence upconversion crystallog | ||||
| Dewey Decimal Classification: | 500 Science > 540 Chemistry & allied sciences | ||||
| Status: | Published | ||||
| Refereed: | Yes, this version has been refereed | ||||
| Created at the University of Regensburg: | Partially | ||||
| Item ID: | 5572 |
Abstract
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 ...
Abstract
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 which agrees with the result from stationary spectroscopy in a nonpolar solvent. The extent (4300 cm-1) of the dynamic Stokes shift is largely due (50%) to H-bonding, however. The observations imply that H-bonds with 4AP adiabatically follow the dielec. relaxation of the methanol network. The stimulated emission band is also used to measure solvation dynamics. The evolving band is monitored by transient absorption spectroscopy of supercontinuum probe pulses. But the excited-state absorption spectrum, its relative amplitude, and its evolution are needed to ext. n(t) from such measurements. These key data are obtained by comparison with the upconversion results. Thus calibrated photometrically, 4AP transient absorption can be used to monitor solvation dynamics in any solvent. The excited-state absorption spectrum is assigned with the help of time-dependent d.-functional calcns. Fluorescence excitation and double-resonance spectroscopy of isolated 4AP, cooled in a supersonic jet, is used to det. optically active modes. An intramol. reorganization energy is inferred which is consistent with the value in 2-methylbutane (2025 cm-1). The crystal structure is also provided.
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