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Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 361-763, KoreaReceived September 4, 2002Key Words : Fluorescent quenching, Chemosensor, Photoinduced electron transfer, Stern-Volmer plotThe fluorescent chemosensor of fluorophore-space-receptortype requires the suppression of the interaction between thefluorophore and the quenching metal cations so as to observefluorescence changes on the metal binding. The crownethers have been derivatized with anthryl groups and differ-ent spacer units in the “fluorophore-space-receptor”. Thesesystems have been designed to explore further understandingof PET process. The spacer units have been varied in orderto observe the effect of spacer on the flexibility of thefluorophore unit with respect to the receptor moiety, theorientation of the fluorophores with respect to each otherdepending on the structure of spacer, and the interactionbetween the fluorophore and the receptor unit. SinceCzarnik,

Selective Photoinduced Electron Transfer-Based Cyanoanthryl Fluorescent Chemosensors for Paramagnetic Metal Cations