Abstract
A highly selective and sensitive fluorescent Zn(2+) sensor N-(2-(benzo[d]thiazol-2-yl)phenyl)-2-((pyridin-2-ylmethyl)amino)acetamide (1) that derived from 2-(2'-aminophenyl)benzothiazole has been developed. In aqueous solution (HEPES/CH3CN=4/6, v/v, HEPES 20mM, pH = 7.4), sensor 1 displays highly selective recognition to Zn(2+) over other metal ions with a distinct longer-wavelength emission enhancement. Sensor 1 binds Zn(2+) through its amide form with a 1:1 binding stoichiometry, which switched on the excited-state intramolecular proton transfer (ESIPT).
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