Pyridoxal Derived AIEgen for Fluorescence Turn-off Sensing of Cu and Fe Ions and Fluorescence Imaging of Latent Fingerprints.

Schiff base 4-((E)-((E)-(2-hydroxybenzylidene)hydrazono)methyl)-5-(hydroxymethyl)-2-methylpyridin-3-ol (HSP) was synthesized by condensing vitamin B cofactor pyridoxal with salicylaldehyde hydrazone, and characterized by standard spectroscopic techniques (FT-IR, H NMR, C NMR, and ESI-MS). The solution of HSP in DMSO/HEPES (10 mM, pH = 7.4) mixed solvents with varying HEPES fractions (f) from 0 to 95% showed aggregation-induced emission (AIE).