Abstract
Electro optical emission measurements have often been used for the determination of dipole moments of fluorescent excited states. In this publication results from such measurements on a non-conjugated bichromophoric donor-acceptor molecule in cyclohexane, benzene and dioxane solutions are reported and compared to literature values determined by quite different time resolved microwave conductivity (TRMC) measurements. The dipole moment of the first excited state is found to be around 80 × 10-30 cm, in benzene and in dioxane which is in very good agreement with the results from TRMC measurements, if a comparable description of the in solution effective electric field is used with both methods. The results in cyclohexane do not agree, most probably because of the short excited state life time in this solvent. In addition, the direction of the transition moment was determined from the electro optical measurements to be parallel to the excited state dipole moment. This information cannot be derived from TRMC m...
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