Abstract
The spectroscopic properties of the title compound styrylanthracene (StA) and its derivatives (R: NO 2, CN, Br, Me, OMe and NMe 2) were studied by picosecond time-resolved absorption techniques in solution at room temperature. The lifetime of the excited singlet state S 1 varies with increasing the solvent polarity from 1–3 ns to ⩽100 ps for compounds with strong electron-donating (OMe and NMe 2) and -accepting (CN and NO 2) groups. The effect of polarity on the deactivation pathways of these push–pull polyenes is suggested to be due to an intramolecular charge transfer.
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