Abstract
A novel Schiff base derivative (Z)-3-(4-(hexyloxy)phenyl)-2-(4-((E)-2-hydroxybenzylidene amino)phenyl)acrylonitrile (L) was designed, synthesized and characterized. L was used as a Zn2+ selective, turn-on, fluorescent chemosensor with a detection limit of 0.1 μM in DMF. 1:1 stoichiometric complex formation of L wih Zn2+ was confirmed through fluorescent titration experiments and Job’s plot. The enhancement of fluorescence intensity of L with addition of Zn2+ is the consequence of the inhibited isomerization of the C=N bond, namely chelation-enhanced fluorescence (CHEF) effect. α-Cyanostilbene-modified Schiff L was designed as a highly selective and sensitive zinc chemosensor. The complexation of L with Zn2+ enhanced the fluorescence intensity. This chemosensor could distinguish clearly Zn2+ from Cd2+, a frequently encountered trouble in the design for the Zn2+ fluorescent probes.
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