Abstract
Photophysical processes are studied in a new class of dyes containing a chromophoric part and a crown ether part (crown ether styryl dyes). Photoisomerization is proposed to be the main channel of nonradiative decay of the singlet excited electronic state. The temperature dependence of fluorescence decay was measured and the lifetime of the trans-isomer in excited electronic state was found to decrease with temperature in ethanol solutions. Isomerization around the CC bond is discussed, and the activation barrier is estimated as 2.3 and 1.5 kcal/mol for the two crown ether styryl dyes studied.
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