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Abstract
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A new N3O2 aza-crown macrocyclic ligand (L) bearing two fluorophore naphthalene moieties was synthesized and characterized by IR, 1H and 13C NMR, DEPt-135, HSQCGP, microanalysis as well as mass spectrometry. Comparative studies on the effect of various metal cations such as Cr(III), Cu(II), Cu(I), Zn(II), Cd(II), Pb(II), Na(I), Ni(II), Co(II), Ba(II), Fe(II), Fe(III), Al(III), La(III), Au(III), Mg(II), Cs(I), Ca(II), Hg(II), K(I), Mn(II) and Ag(I) on fluorescence of L were investigated in aqueous ethanol. The macrocycle was found to be a sensitive and selective fluorescence chemosensors for Mg2+. The binding constant value was established as 1.36 × 105 M ;+ along with 1:1 stoichiometry for Mg2+- L. The detection limit was 2.51 × 10-8 M with a rapid response time. Chemical inputs of Mg2+ and Fe3+ ions satisfy the conditions of INHIBIT molecular logic gate
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