Naphthalen-2-yl-N′-(2-hydroxybenzoyl)benzohydrazonate as dual metal ion chemosensor for the detection of Fe3+ and Na+ ions

New probe naphthalen-2-yl-N′-(2-hydroxybenzoyl)benzohydrazonate (NHBH) chemosensor has been prepared and characterized by IR, 1 H NMR, 13 C NMR and Mass Spectroscopic techniques. The probe (NHBH) was subjected to study its cation sensing ability with twelve different metal chloride salt (Al 3+ , Ca 2+ , Co 2+ , Cr 3+ , Fe 3+ , Cu 2+ , Mn 2+ , Ni 2+ , Zn 2+ , Hg 2+ , K + and Na + ) in 1:4 methanol water medium by using absorption and emission titration experiments. The results showed that the probe detected Fe 3+ and Na ​ + ​ions by showing absorption enhancement and fluorescence emission quenching. Further, NHBH exhibited good selectivity for Fe 3+ and Na ​ + ​ions in the presence of mostother metal ions. Job's plot analysis authenticated the 1:1 binding nature of NHBH with Fe 3+ and Na ​ + ​ions. Further, DFT studies validated the formation of probe (NHBH), fluorophore-quencher (Fe-NHBH) complex formation. New probe naphthalen-2-yl-N′-(2-hydroxybenzoyl)benzohydrazonate (NHBH) chemosensor has been prepared and characterized by IR, 1 H NMR, 13 C NMR and Mass Spectroscopic techniques. The probe selectively detected Fe 3+ and Na ​ + ​ions. • Probe NHBH has been prepared and characterized by NMR ( 1 H and 13 C) and mass spectral data. • The probe NHBH selectively detected Fe 3+ and Na ​ + ​among various other metal ions (chloride salts). • Fluorophore-quencher complex (NHBH-Fe 3+ ) has been confirmed through NMR titration, mass spectrum and theoretical studies. • Paramagnetic nature of the Fluorophore-quencher complex (NHBH-Fe 3+ ) has been confirmed by EPR spectrum.