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A naked-eye fluorescent sensor for copper(II) ions based on a naphthalene conjugate Bodipy dye

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Abstract

A novel naphthalene-Bodipy dye (N-Bodipy) was designed, prepared and characterized. N-Bodipy showed a selective and sensitive recognition toward Cu(II) ions as a fluorescent antenna group in aceto-nitrile/water over other metal cations. The complexation between Cu(II) ions and N-Bodipy gave a specific color change as well as caused fluorescence quenching under long-wavelength light (365 nm). The remarkable quenching effect in fluorescence intensity centered at 538 nm was only observed in the presence of copper(II) ions. Moreover, the orange color of N-Bodipy solution turned pale-yellow depending on the complexation effect in daylight. The complex stoichiometry was determined using a Job's plot and it was found to be 2: 1 (ligand/metal). The binding constant was calculated with the Benesi-Hildebrand equation to be 1.39 x 1010 M−1 and the detection limit was 1.28 μM (LOD = 3α/slope, α is the standard deviation) for Cu(II). The data proved that the binding between N-Bodipy and Cu(II) is chemically reversible.

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Acknowledgements

We thank the Research Foundation of the Selcuk University (BAP) for financial support of this work (under project number: 15401013). The authors express their appreciation to Prof. Dr Ersin Güler for helpful discussions.

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Authors and Affiliations

  1. Department of Chemistry, University of Selcuk, Campus, 42075, Konya, Turkey

    Canan Baslak & Ahmed Nuri Kursunlu

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  1. Canan Baslak
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  2. Ahmed Nuri Kursunlu
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Correspondence to Ahmed Nuri Kursunlu.

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Baslak, C., Kursunlu, A.N. A naked-eye fluorescent sensor for copper(II) ions based on a naphthalene conjugate Bodipy dye. Photochem Photobiol Sci 17, 1091–1097 (2018). https://doi.org/10.1039/c8pp00137e

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