Abstract
Fluorescent sensors are efficient and convenient tools for metal ions analysis. Herein, a new fluorescent pyrene-quinoline-based bisoxime-type sensor PQS, possessing the monomer to excimer emission switching feature, was synthesized and the sensing ability toward Cu2+ was throughly studied. Interestingly, the blue emission of monomer PQS in dilute solution converted to the green fluorescence of excimer in aggregated state. Meanwhile, the blue fluorescence emission of sensor PQS quenched in the existence of Cu2+ with no apparent response toward other competitive cations. The plausible complexation ratio 1:1 of sensor PQS to Cu2+ was substantiated by Job's plot, mass spectrometric analysis combined with the density functional theory calculation. Furthermore, PQS coated paper strips were prepared and used for the rapid and convenient monitoring Cu2+ in a visible manner.
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