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Identifying the Stoichiometry of Metal/Ligand Complex by Coupling Spectroscopy and Modelling: a Comprehensive Study on Two Fluorescent Molecules Specific to Lead

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Abstract

Two new chemosensors for lead (II) were synthesized based on 5-((anthracen-9-ylmethylene) amino)quinolin-10-ol (ANQ). ANQ was modified in the para position of the imine group via a methoxy link either with methylmethacrylate (ANQ-MMA) or styrene (ANQ-ST). Complexation of those molecules with Pb2+ was studied at room temperature using UV-Visible absorption and fluorescence spectroscopies. Thanks to the UV-visible absorption spectroscopy, it appeared that ANQ-MMA formed 1:1 and 1:2 complexes with lead (II) and ANQ-ST only 1:1 complex. For both molecules, the fluorescence excitation-emission matrices (EEM) signal intensity increased from 0 to 100 μmol.L−1 of lead (II) followed by a saturation for higher concentrations. The decomposition of the obtained EEMs gave a set of empiric fluorescent components that have been directly linked to the distribution of lead complexes obtained with the UV-visible absorption spectroscopy study. This correlation allowed to evidence metal/ligand complex stoichiometry and emerge as a new method to identify empiric components. Moreover, the two ligands showed a promising selectivity for Pb2+, turning them interesting probes for this hazardous metal.

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Acknowledgements

This work is part of the PREVENT program financed by the University of Toulon, Toulon-Provence-Méditerranée and the Conseil Départemental du Var, France. The authors acknowledge financial support from the Regional Council of Provence Alpes Côte d’Azur (France) and Academy of Finland.

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Authors and Affiliations

  1. MAPIEM Laboratory, University of Toulon, CS 60584, 83041, Toulon, Cedex 9, France

    William René & Catherine Branger

  2. IM2NP Laboratory, University of Toulon, CS 60584, 83041, Toulon, Cedex 9, France

    William René & Madjid Arab

  3. MIO Laboratory, University of Toulon, CS 60584, 83041, Toulon, Cedex 9, France

    William René, Stéphane Mounier & Véronique Lenoble

  4. Laboratory of Computational and Process Engineering, Lappeenranta-Lahti University of Technology LUT, P.O. Box 20, FI-53851, Lappeenranta, Finland

    Katri Laatikainen

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  1. William René
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  2. Madjid Arab
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  3. Katri Laatikainen
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  4. Stéphane Mounier
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  6. Véronique Lenoble
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Correspondence to Catherine Branger or Véronique Lenoble.

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René, W., Arab, M., Laatikainen, K. et al. Identifying the Stoichiometry of Metal/Ligand Complex by Coupling Spectroscopy and Modelling: a Comprehensive Study on Two Fluorescent Molecules Specific to Lead. J Fluoresc 29, 933–943 (2019). https://doi.org/10.1007/s10895-019-02405-0

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  • DOI: https://doi.org/10.1007/s10895-019-02405-0

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