Pyrene-based Schiff Base as Selective Chemosensor for Copper(ll) and Sulfide Ions

摘要

1-aminopyrene and 2,4-dihydroxy benzaldehyde derived pyr-ene based chemosensor was obtained by single step synthesis. The sensor is highly selective and sensitive towards Cu~(2+) and S~(2-) ions. Sensitivity of the sensor towards Cu~(2+) was assessed by UV/Visible absorption and emission spectroscopy while the same for the S~(2-) was colorimetrically assessed. Static quenching mechanism for Cu~(2+) was established by time-resolved fluorescence spectroscopy. Stoichiometry of the sensor with Cu~(2+) and S~(2-) ions were found to be 2:2 and 1:1 with the corresponding binding constants as 5.65 ×10~5M~(-1) and 3.08 ×10~4 M~(-1). The lower limit of detection of Cu~(2+) and S~(2-) by 1 is 0.503 and 10 μM respectively projecting the sensor as a potential agent for applications in real samples.