Abstract
An anthracene appended PET chemosensor, anthracene-9-carboxylic acid (3,4-dimethoxy-phenyl)-amide (A1 ), has been synthesized through condensation of corresponding acyl chloride and 3,4-dimethoxyaniline containing C = O and NH as receptors. The sensor A1 exhibited selective fluorescence turn-on behavior towards Cu2+ and Zn2+ ions in CH3CN. Cu2+ ions displayed 18-fold enhancement (Φ = 0.006→0.071) in the fluorescence spectrum of A1 , which are otherwise well known for fluorescence quenching phenomenon. Moreover, A1 could easily discriminate between Zn2+ and Cd2+ ions, the two metal ions of similar nature. The Job’s plots analysis determined 2:1 (A1 :Cu2+/Zn2+) stoichiometry between the sensor A1 and Cu2+/Zn2+ ions. The LOD values were calculated to be 1.75 and 3.08 µM for Cu2+ and Zn2+, respectively.
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