Abstract
A fluorescent chemosensor PAOP based on pyrene formaldehyde and o-phenylenediamine was successfully synthesized, and its molecular structure was characterized by NMR and mass spectrometry. PAOP exhibits excellent fluorescence sensing ability for Ag+ in DMF with high selectivity and sensitivity. In addition, PAOP can selectively identify common trivalent metal ions (Al3+, Fe3+, Cr3+) in ethanol solution. After the addition of common trivalent metal ions, the fluorescence of PAOP ethanol solution changed from blue–violet to blue–green. The results of the reversible fluorescence change, mass spectra, FT-IR and DFT calculations proved that the selective fluorescence response towards the special metal ions was attributed to formation of stable 2:1 complex PAOP@Mn+. PAOP has good recovery in detection of Cr3+ in real water samples and shows great potential application as a chemosensor.
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