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Theses

Design de matériaux organiques électro-photo modulables

Abstract : This Ph-D work deals with the design and the preparation of photo and electro-tunable materials. The first part of the manuscript deals with the influence of a fluorinated substitution onto a triarylamine moiety. The electron withdrawing fluorines modify the charge transfer process and customize the emission wavelength. In addition, the fluorinated groups increase the hydrophobic character of the material. This should be useful for the formation of organic nanorods via a template assisted method. The rest of the manuscript focuses on the tetrazine fluorophore which exhibits a yellow fluorescence that can be quenched in the presence of electron rich pollutants. A new methodology to covalently link a tetrazine derivative onto the surface of silica nanoparticle is discussed. The particles have similar photophysical properties as the tetrazine in solution allowing the use of this material as a solid sensing device. The incorporation into the silica core of a naphtalimide dye improves the overall fluorescence quantum yield of the system and provides nanoobjects emitting a white fluorescence. The photophysical phenomena involved in those particles are detailed in the manuscript. Finally, the synthesis and the photophysical properties of tetrazine-diacetylene dyads are discussed. Poly-diacetylenes prepared via a photopolymérisation process display different phases characterized by different colours. This part presents the preliminary results to understand the influence of the phase changes of the polymer on the tetrazine emission.
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Jérémy Malinge. Design de matériaux organiques électro-photo modulables. Autre. École normale supérieure de Cachan - ENS Cachan, 2012. Français. ⟨NNT : 2012DENS0057⟩. ⟨tel-00803182⟩

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