| Abstract
| - The influence of localized excited (LE) states on the spectroscopy of charge transfer (CT) complexes hasbeen examined for a series of complexes formed between methyl-substituted benzene donors and 1,2,4,5-tetracyanobenzene as acceptor in 1,2-dichloroethane and octanenitrile solvents. A molecular orbital modelwas used to describe the appearance of multiple CT absorption bands that occur in the spectra of thesecomplexes. The influence of LE states in these CT absorptions was explored using time-resolved lineardichroism spectroscopy where the direction of the CT transition moment vector (TMV) was used to probethe magnitude of intensity borrowing. The TMV directions for each of the observed CT transitions within theabsorption spectra were determined for several complexes. In some cases, the observed CT transitions wereinterpreted as being pure CT transitions; in others the observed transitions are influenced significantly by aLE transition. The correlation between the TMV directions and the transition energy suggests that the magnitudeof intensity borrowing is influenced not only by the energy difference between the CT and LE transitions butalso by the specific character of the transitions under consideration.
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