Lowik DEWEZ-RASZKA PhD defense
Exploiting rare-earth luminescence for the detection of pollutant ions: insights into coordination polymer–analyte interactions
Vendredi 19 septembre, 09h30Passé
Solid State Chemistry and Materials (CSM) team
Abstract
Water is essential to life and is threatened by pollution resulting from human activities. To ensure its potability, the World Health Organization has defined specific criteria. However, current methods for evaluating potability are time-consuming, expensive, and require complex laboratory equipment. The aim of this PhD thesis is to propose materials capable of rapidly detecting toxic ionic species, known as analytes, in aqueous environments through a light signal. The selected materials for this purpose are Coordination Polymers (CPs), also known as Metal-Organic Frameworks (MOFs) when they are porous, based on Rare Earth Elements (RE) which are luminescent in the visible range, and commercial carboxylate ligands. The goal is to develop materials that can selectively and quantitatively adsorb and detect species harmful to health or the environment. To better target detector/analyte pairs, the mechanisms responsible for the detection (analyte capture and luminescence decrease in this work) were studied. Two main types of ligands were used, leading to the synthesis of several families of CPs. In particular, MOFs based on the ligand 2,5-pyrazinedicarboxylate and RE (Eu) exhibit strong luminescence and promising porosity for the project. Additionally, a MOF based on Tb and the ligand 2-hydroxybenzene-1,4-dicarboxylate was studied in depth. It is capable of quantitatively detecting Fe(II), Fe(III), and Cr(III) ions. The mechanisms involved have been discussed and reveal that the decrease in luminescence results from both static and dynamic quenching processes.
Jury
Hélène Serier-Brault - Maître de Conférences HDR – Université de Nantes, Institut des Matériaux de Nantes Jean Rouxel / Reporter
Jean-Michel Rueff - Professeur des Universités – ENSICAEN, CRISMAT / Reporter
Isabelle Gautier-Luneau - Professeur des Universités – Université Grenoble Alpes, Institut Néel / Examiner
Karine Costuas - DR CNRS – Université de Rennes, Institut des Sciences Chimiques de Rennes / Examiner
Nathalie Audebrand - Professeur des Universités – Université de Rennes, INSA Rennes, Institut des Sciences Chimiques de Rennes / PhD Director
Yan Suffren - Maître de Conférences – INSA Rennes, Institut des Sciences Chimiques de Rennes / Co-Supervisor
Olivier Guillou - Professeur des Universités Conférences – INSA Rennes, Institut des Sciences Chimiques de Rennes / Invited
Contacts
Nathalie Audebrand, nathalie.audebrand@univ-rennes.fr
Yan Suffren, yan.suffren@insa-rennes.fr
