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Coumarin-appended cyclophanes bearing positively or negatively charged side chains were synthesized as a water-soluble host (1a or 1b, respectively). Host 1a and 1b showed fluorescence bands with fluorescence maxima at 404 nm originated from coumarin moiety. As a host for guest molecules by using macrocyclic cavity, cationic host 1a binds anionic guests such as 6-p-toluidinonaphthalene-2-sulfonate...
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