Abstract
Bis-8-hydroxyquinoline-armed diazatrithia-16-crown-5 ( 1) and diazadibenzo-18-crown-6 ( 2a) ligands selectivity respond to Zn 2+ over other tested metal ions, including Cd 2+, via large increases in fluorescence, while other side-armed diazadibenzo-18-crown-6 ligands ( 2b– f) and bis(dansylamidoethyl)-armed 1,8-dimethyltetraza-14-crown-4 ligand ( 3) do not respond to tested metal ions via an increase in fluorescence. Ligand 1 forms a 1:1 complex (ML) and a 1:2 complex (M 2L) with Zn 2+, and these have emission maxima at different wavelengths (540 and 500 nm, respectively). Due to the large fluorescent enhancement factor of ligand 1 for Zn 2+, ligand 1 is well suited for use as a fluorescent chemosensor for Zn 2+.
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