Abstract
The effect of ion pair formation on the kinetics of the decay of the photoisomers and triplet states of cationic benzimidazolocyanine dyes is studied by flash photolysis. An increase in the rate constant of the reversecis-trans isomerization of the photoisomers is observed when ion pairs are formed (in nonpolar solvents). In the case of benzimidazolocyanine dyes with the I− anion, ion-pair formation causes an increase in the rate constant of decay of the triplet state. Acceleration of S1 ⇝ S0 internal conversion is discovered for the dyes with I−1
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