ESIPT-based dual-emissive perimidine derivative as a rapid and sensitive sensor for Cu and Al: Construction of memory device, 2-to-1 encoder and 1-to-2 decoder.

An ESIPT based fluorescent perimidine derivative oPSDAN was developed and characterized by H NMR, C NMR and mass spectroscopy. The study of the photo-physical properties of the sensor unveiled its selectivity and sensitivity towards Cu and Al ions. The sensing of ions was accompanied by colorimetric change (for Cu) as well as emission turn-off response. The binding stoichiometries of sensor oPSDAN with Cu ion and Al ions were determined to be 2:1 and 1:1, respectively. The binding constants and detection limits for Cu and Al were calculated from the UV-vis and fluorescence titration profiles as, 7.1 × 10 M, 1.9 × 10 M and 9.89 nM, 1.5 × 10 M, respectively. The mechanism was established by H NMR as well as mass titrations and was supported by DFT and TD-DFT calculations. The UV-vis and fluorescence spectral results were further utilized for construction of memory device, encoder and decoder. Sensor-oPSDAN was also tested for determining Cu ions in drinking water.