Abstract
A water-soluble fluorescent sensor, 1, based on the "receptor-spacer-fluorophore" [2-(2'-aminophenyl)benzoxazole-amide-2-picolylamine] sensor platform, demonstrates the high sensitivity for Zn(2+) with a 25-fold fluorescence enhancement upon chelation to Zn(2+) and also exhibits high selectivity to Zn(2+) over other metal ions. X-ray crystal structure of Zn(2+) complex reveals that the amide oxygen (O2) cooperates with 2-picolylamine unit (N3, N4) as a receptor bind Zn(2+).
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