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Relation between charge transfer absorption and fluorescence spectra and the inverted region

Marcus, R. A.·1989·The Journal of Physical Chemistry

Abstract

The theoretical expression for the plot of a charge transfer (CT) band intensity vs frequency is known to parallel that for the plot of electron-transfer rate constant k^(ET) vs –ΔG^0. We use this parallelism to explore a recent model in the literature on the possible role, if any, of partial dielectric saturation of the solvent on the “inverted region” of electron-transfer reactions. A simple approximate expression is obtained for the full width at half-maximum for the k^(ET) and spectral plots and is tested using recent numerical results for calculated k^(ET) vs –ΔG^0 curves. Studies of experimental widths of CT bands are used, thereby, to test ideas on the possible presence and effects of partial dielectric saturation and on the observation of the inverted region. Further uses of charge-transfer spectra, when both the absorption and fluorescence data are available, are also described, including the determination of the “0 → 0 transition energy” ΔE_( 0 → 0) for systems displaying little or no vibrational structure.

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Authors
Marcus, R. A.
Venue
The Journal of Physical Chemistry
Published
1989-04
Volume
93
Issue
8
Pages
3078-3086
ISSN
  • 0022-3654 (ISSN-L)
  • 1541-5740
OpenAlex
W2010149747
Cited by
464
References
0
FWCI
4.37
Type
journal article
Language
en
Open access
closed

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