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<dc:title xml:lang="en">Supramolecular polymers of triarylamines : studies in aqueous medium and covalent capture of their self-assemblies</dc:title>
<dcterms:alternative xml:lang="fr">Polymères supramoléculaires de triarylamines : stabilisation des structures auto-assemblées et études en milieu aqueux</dcterms:alternative>
<dc:subject xml:lang="fr">Polymères supramoléculaires</dc:subject>
<dc:subject xml:lang="fr">Triarylamines</dc:subject>
<dc:subject xml:lang="fr">Milieu aqueux</dc:subject>
<dc:subject xml:lang="fr">Stabilisation des structures</dc:subject>
<dc:subject xml:lang="en">Supramolecular polymer</dc:subject>
<dc:subject xml:lang="en">Triarylamine</dc:subject>
<dc:subject xml:lang="en">Aqueous medium</dc:subject>
<dc:subject xml:lang="en">Covalent capture</dc:subject>
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<tef:elementdEntree autoriteExterne="032717334" autoriteSource="Sudoc">Solutions aqueuses (chimie)</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="031552919" autoriteSource="Sudoc">Chimie supramoléculaire</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Pour contrôler les systèmes chimiques complexes, les outils de la chimie supramoléculaire s’avèrent puissants et représenteront certainement une des technologies clef du 21e siècle. En effet, la réversibilité intrinsèque des liaisons chimiques impliquées dans la formation d'assemblages supramoléculaires apporte à ces systèmes un caractère "adaptatif", capable de réorganiser leur structure en fonction des conditions environnementales. Ce comportement s’avère totalement inédit malgré le grand nombre d’études effectuées sur cette famille de molécules du fait de ses propriétés photoactives. Au cours des dernières années, notre groupe a synthétisé de nombreux dérivés de triarylamines (TAAs), qui ont été utilisés pour produire des architectures supramoléculaires multifonctionnelles. En fonction des différents groupements qui substituent ce coeur TAA, diverses morphologies ont pu être observées et les propriétés physiques de ces auto-assemblages produits dans des solvants non polaires tels que les solvants chlorés ou le toluène se sont également révélées variées (propriétés cristal-liquide, conductrices, plasmoniques...). A partir de ces travaux, mon projet de thèse consistait en deux objectifs: a) étudier l'auto-assemblage et les propriétés de ces composés TAA dans des solvants polaires comme l'eau ou le méthanol. Pour cela, comme tenu du caractère hydrophobe des TAAs, il s'avérait nécessaire de synthétiser de nouvelles molécules incorporant des groupements latéraux favorisant la solubilité dans de tels solvants; b) stabiliser les auto-assemblages de triarylamine par polymérisation covalente et étudier les propriétés physiques associées à ces nouvelles structures. Pour cela, il convenait de synthétiser de nouvelles molécules incorporant des groupements polymérisables sur les chaines latérales, qui n'influençaient pas les propriétés d'auto-assemblages des TAAs. [...]</dcterms:abstract>
<dcterms:abstract xml:lang="en">Based on the unique directionality and reversibility of non-covalent interactions, supramolecular self-assembly works as an elegant methodology to construct multifunctional hierarchical architectures. Inspired by nature, where water provides a vital environment for biological process such as biomacromolecular folding, water-soluble supramolecular polymers have been prepared and studied so as to mimic related biological systems. On the other hand, owing to the dynamic nature of their non-covalent bonds, supramolecular polymers often lack mechanical robustness. Thus, cross-linking strategies have been developed in order to combine highly ordered molecular arrangement inherent to the sef-assembly and mechanical robustness of the covalent backbone, which might bee promising to reach functional materials for practical applications. In this thesis, we focus on well-designed triarylamine molecules which are known to self-assemble into supramolecular polymers with excellent physical properties, as discovered by our group. In particular, molecules studied in this manuscript are based on tris-amide triarylamine scaffold known to produce self-assemblies with metallic conductivity and self-healing behavior. First, we studied the self-assemblies of three novel tris-amide triarylamine derivatives decorated with either poly(ethylene glycol) (PEG), peptide or cyanine dyes side chains on the three amide positions in polar solvents, i.e. either water or methanol. Characterizations by various physico-chemical techniques (NMR, UV-Vis absorption, fluorescence, infrared spectroscopies, microscopies, scatterings) demonstrated the formation of fibrillar aggregates for all molecules in such polar environments. Overall, this study suggest that the triarylamine core act as the main driving force for the self-assembly into columnar aggregates while side chains ensure solubility in these solvents and/or favor the formation of chiral architectures. In a second study, we investigated the formation of tris-amide triarylamine supramolecular polymers decorated with norbornene and siloxane end side chains, which could be further used to freeze the self-assembled structures by ring opening metathesis polymerization and sol-gel methods, respectively. [...]</dcterms:abstract>
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