The immobilized azo-azomethine receptors on amorphous SiO2, S-B, SiO2 nanoparticles, S-NPs, and NaY zeolite, S-ZY, have been prepared and applied as solid phase sensors for detection of HSO4ˉ, over other interfering anions, in 100% aqueous media. Remarkably, S-B and S-ZY show unique and rapid sensitivity towards HSO4ˉ, which could it easily visualized through naked eye detection even at 5×10-4 molL-1 and 4×10-4 molL-1, respectively. The fabricated solid phase sensors were characterized using powder XRD diffraction, TGA-DTA, FE-SEM and also FT-IR techniques. Moreover, the related molecular anion receptor, HL, has been prepared and used for naked eye detection of Fˉ and AcOˉ, in dry DMSO. The anions recognition ability of HL was also evaluated using UV–Vis and 1H NMR spectroscopic methods.
