A new coumarin based Schiff-base chemosensor-(E)-7-(((8-Hydroxyquinoline-2-yl) methylene) amino)-4-(trifluoromethyl)-2H-chromen-2-one (H 12 L) was designed and synthesized. This chemosensor was evaluated as a colorimetric sensor for Fe 3+ and fluorescence "turn on-off" response of Zn 2+ and Cu 2+ using steady-state absorption and fluorescence spectroscopy. In presence of Fe 3+ and Zn 2+ , the absorption intensity as well as the fluorescence emission intensity increases drastically compared to other survey metal ions, with a distinct color change which provide naked eye detection. However, in presence of Cu 2+ , it also exhibits quenching of fluorescence emission intensity which may be due to paramagnetic nature of Cu 2+ ion. The stoichiometric ratio and binding constant were calculated using Benesi-Hildebrand relation and Job's plot analyses giving 1:1 stoichiometry. The interaction and binding nature of H 12 L with Zn 2+ ion was further confirmed by 1 H NMR titration assay and ESI-Mass spectral analysis. The reversibility nature of H 12 L was also studied using EDTA as a chelating ligand. Moreover, H 12 L exhibits two INHIBIT logic gates with two different chemical inputs (i) Zn 2+ (IN1) and Cu 2+ (IN2) and (ii) Zn 2+ (IN1) and EDTA (IN2) and the emission as output. Again, an IMPLICATION logic gate is obtained with Cu 2+ and EDTA as chemical inputs and emission as output mode. Both H 12 L and metal-complexes were optimized using density functional theory and vibrational frequency calculations confirm that both are at local minima on the potential energy surfaces. The corresponding energy difference between HOMO and LUMO of H 12 L, Zn-complex and Cu-complex are found to be 2.11, 0.81 and 0.17 eV, respectively.A new coumarin based Schiff-base chemosensor has been synthesized and characterized Evaluated as a colorimetric sensor for Fe 3+ and fluorescence turn on-off response of Zn 2+ and Cu 2+ Both Benesi-Hildebrand relation and Job's plot analyses gives 1:1 stoichiometry Free ligand can be reusable and recyclable by treating the complex probe with EDTA Binary logic function of two INHIBIT with an IMPLICATION logic gate is anticipated

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The water/n-heptane interface has been exploited as a viable and selective platform for the transformation of quasi-spherical ZnO nanoparticles to nanorods.