An oxazabicycle and an oxazatricycle were efficiently synthesized by coupling of coumarins and N-alkylquinolium or isoquinolium salt to investigate their fluorescence redox-switching properties. Chemical reduction of the strongly fluorescent oxazabicycle and oxazatricycle results in the ring-opened products with a distinct decrease in emission intensity. Both resulting ring-opened species can be swiftly reverted to the original ring-closed forms by oxidation.
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Lin et al. (2009) studied this question.
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