Excited charge transfer states in donor-acceptor indole derivatives

Citation
P. Borowicz et al., Excited charge transfer states in donor-acceptor indole derivatives, CHEM PHYS, 244(2-3), 1999, pp. 251-261
Citations number
34
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
CHEMICAL PHYSICS
ISSN journal
03010104 → ACNP
Volume
244
Issue
2-3
Year of publication
1999
Pages
251 - 261
Database
ISI
SICI code
0301-0104(19990615)244:2-3<251:ECTSID>2.0.ZU;2-O
Abstract
Solvent-dependent electronic structure of the selected donor (D)-acceptor ( A) derivatives of 5-methylindole and 5-methoxyindole containing benzonitril e as an electron acceptor in the fluorescent charge transfer (CT) states ha s been investigated. The mechanism of the radiative charge recombination (C T)-C-1 --> S-0 is discussed in terms of the Mulliken-Murrell model of the C T complexes and the Marcus theory of photoinduced electron transfer (ET). S olvatochromic effects on the spectral position and profile of the stationar y fluorescence spectra point to a considerable CT character of the emitting singlet states of all the compounds studied. The determination of the elec tronic transition dipole moments corresponding to the (CT)-C-1 --> S-0 fluo rescence and the band-shape analysis of the corresponding spectra leads to the quantities relevant for the charge recombination in the Marcus inverted region. It is shown that some of the photophysical properties of the compo unds can be predicted in terms of a simple model from the properties of ind ividual chromophores. (C) 1999 Elsevier Science B.V. All rights reserved.