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Développement de systèmes π-conjugués aux propriétés de fluorescence induite par l'agrégation (AIE).

Abstract : The fluorescence phenomenon while relatively rare in nature, is also commonly operating in various fields including optoelectronics for the conception of OLEDs and solar concentrators and biomedicals for imaging and therapy. This work falls into this context and aims at designing fluorescent molecules possessing aggregation induced emission (AIE) properites. In contrast to conventional fluorophores that suffer of aggregation caused quenching (ACQ) phenomenom, AIE fluorophores exhibit in general strong emission in the solid state while there are non-emissive in solution due to the restriction of intramolecular motion (RIM) which favor the radiative decay. This manuscript is built upon four chapters. The introduction describes the concept and the conditions required for a molecule to exhibit a AIE behaviour. The second chapter describes the synthesis and the characterization of AIEbased diphenylbuta-1,3-diene skeleton bearing electropolymerizable thiophene moieties. The third chapter is related to the development of donor-acceptor systems built upon a tetraphenylethene (TPE) core in view of extending their absorption / emission properties to the red or near infrared (600 nm - 1200 nm) region of the spectrum. Finally, the last chapter deals with the control and the modulation of the emission wavelength by exploiting the AIE behavior of two fluorophores based on tetraphenylethene and quinoline malononitrile induced by the folding of the chain of a thermoresponsive polymer, the poly(2-n-propyl-2-oxazoline).Keywords: Molecular design, fluorophore, fluorescent, aggregation induced emission, AIE, organic synthesis, diphénylbuta-1,3-diène, tetraphenylethene, quinoline malononitrile, poly(2-oxazoline)
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https://tel.archives-ouvertes.fr/tel-03775516
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Submitted on : Monday, September 12, 2022 - 4:20:13 PM
Last modification on : Wednesday, October 12, 2022 - 3:59:07 AM

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Maxime Roger. Développement de systèmes π-conjugués aux propriétés de fluorescence induite par l'agrégation (AIE).. Autre. Université Montpellier, 2022. Français. ⟨NNT : 2022MONTS005⟩. ⟨tel-03775516⟩

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