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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

Abstract : Two new chemosensors for lead (II) were synthesized based on 5-((anthracen-9-ylmethylene) amino)quinolin-10-ol (ANQ): (10-(8-hydroxyquinolin-5-ylimino)methyl)anthracen-9-yl)methyl methacrylate (ANQ-MMA) and ((10-((4-vinylbenzoloxy)methyl)anthracen-9-yl)methyleneamino)quinoline-8-ol (ANQ-ST). Complexation of those molecules with Pb2+ was studiedat 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 evidenced metal/ligand complex stoichiometry and emerge as a new method to identify empiric components. Moreover, the two ligandsshowed a promising selectivity for Pb2+, turning them interesting probes for this hazardous metal.
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Contributeur : Madjid Arab <>
Soumis le : lundi 12 octobre 2020 - 11:36:37
Dernière modification le : jeudi 15 octobre 2020 - 03:21:53

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William René, Catherine Branger, Madjid Arab, Katri Laatikainen, Stéphane Mounier, et al.. Identifying the Stoichiometry of Metal/Ligand Complex by Coupling Spectroscopy and Modelling: a Comprehensive Study on Two Fluorescent Molecules Specific to Lead. Journal of Fluorescence, Springer Verlag, 2019, 29 (4), pp.933-943. ⟨10.1007/s10895-019-02405-0⟩. ⟨hal-02962507⟩

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