From the measurements of the fluorescence lifetimes and the 0-1 emission maxima in solutions, it is concluded that the solvent dependence of the nonradiative transition rates of the lowest excited singlet states of 9-bromoanthracene and 9,10-dibromoanthracene is due to the different extent to which the lowest excited singlet and adjacent higher excited triplet states are stabilized by solvents.
The transient absorption spectra of the title compounds in solutions at room temperature have been measured on the picosecond time scale. For 9-acetylanthracene and acridine there were measurable changes of the spectral shapes in the first picosecond region, while no spectral change was observed for benzophenone.
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