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[reaction: see text] Three novel bichromophoric dyads containing dansylamide and 1,8-naphthalimide linked by oligomethylene spacers of varying length were prepared. The fluorescent moiety can be reversibly selected by protonation/deprotonation of the dansyl residue via control of singlet-singlet energy transfer and photoinduced electron transfer, leading to a molecular optical switch with two spectrally distinguished "on" states.
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Abad et al. (2005) studied this question.
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