A1 Journal article (refereed), original research

Identifying the stoichiometry of metal/ligand complex by coupling spectroscopy and modelling: a comprehensive study on two fluorescent molecules specific to lead

Open Access publication

Publication Details
Authors: René William, Arab Madjid, Laatikainen Katri, Mounier Stéphane, Catherine Branger, Lenoble Véronique
Publisher: Springer Verlag (Germany)
Publication year: 2019
Language: English
Related Journal or Series Information: Journal of Fluorescence
Volume number: 29
Start page: 933
End page: 943
Number of pages: 11
ISSN: 1053-0509
eISSN: 1573-4994
JUFO-Level of this publication: 1
Open Access: Open Access publication


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-STonly 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.

Last updated on 2020-20-03 at 10:03