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Abstract
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A novel linear tetraamine was synthesized via nitro group reduction, followed by the preparation of its Schiff base deriva tive (H₂L) through a reaction with 2-hydroxy-1-naphthaldehyde. The chemosensing properties of H₂L were extensively investigated using fluorescence and UV-Vis spectroscopies, revealing a pronounced fluorescence enhancement in response to mercury ions. A comparative study evaluated the impact of various metal cations—including Cr(III), Mn(II), Fe(II), Fe(III), Co(II), Ni(II), Cu(I), Cu(II), Zn(II), Cd(II), Gd(III), Na(I), K(I), Ba(II), Mg(II), Al(III), Pb(II), Sn(II), Hg(II), and Ag(I)—on the fluorescence and UV-Vis behavior of H₂L in an aqueous ethanol medium. The binding constant for Hg²⁺-L interactions was determined to be 1.32 × 10⁵ M⁻¹, with a 1:1 stoichiometry. Furthermore, H₂L exhibited a low detection limit of 1.40 × 10⁻⁸ M and a rapid response time. Notably, the presence of Hg²⁺ and Cu²⁺ ions satisfied the criteria for an INHIBIT molecular logic gate.
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