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<dc:title xml:lang="fr">Auto-organisation et auto-assemblage de 4,4'-bipyridines et naphtalène diimides</dc:title>
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<dc:subject xml:lang="fr">4,4’-bipyridines</dc:subject>
<dc:subject xml:lang="fr">Viologènes</dc:subject>
<dc:subject xml:lang="fr">Π-dimère</dc:subject>
<dc:subject xml:lang="fr">Cyclophane</dc:subject>
<dc:subject xml:lang="fr">Hélicate</dc:subject>
<dc:subject xml:lang="fr">Auto-assemblage</dc:subject>
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<dc:subject xml:lang="fr">Titane(IV)</dc:subject>
<dc:subject xml:lang="en">4,4’-bipyridines</dc:subject>
<dc:subject xml:lang="en">Viologens</dc:subject>
<dc:subject xml:lang="en">Π-dimer</dc:subject>
<dc:subject xml:lang="en">Cyclophane</dc:subject>
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<dc:subject xml:lang="en">Self-assembly</dc:subject>
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<tef:elementdEntree autoriteExterne="050395505" autoriteSource="Sudoc">Viologènes</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Ces travaux de thèse s’intéressent au développement d’interrupteurs moléculaires contractiles ou extensibles dans lesquelles l’animation serait déclenchée par π-dimérisation intramoléculaire de viologènes, dérivés quaternisés de la 4,4’-bipyridine (4,4’-bipy), ou de naphtalène diimides (NDIs). Dans un premier temps, des dérivés de 4,4’-bipys sont fonctionnalisés de façon à interagir avec une surface de graphite pyrolitique hautement orienté dans le cadre de l’élaboration d’un cyclophane bis-viologènes électro-commutable et adsorbable sur graphite. Par la suite, la préparation d’un interrupteur moléculaire hélicoïdal possédant des liens de types spiroborates a été entreprise à partir de ligands contenant des unités 4,4’-bipy ou viologènes. Cet édifice pourrait être réversiblement contracté ou étendu par π-dimérisation intramoléculaire des unités rédox-sensibles. Enfin, le dernier chapitre présente des assemblages de titane(IV) construits à partir de ligands bis(biphénol) comportant des espaceurs 4,4’-bipys ou NDIs. La longueur des ligands, leur flexibilité ou encore l’éventuel ajout de ligands auxiliaires azotés ont été étudiés et leur impact sur la nature des édifices formés est discuté.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis work aimed at developing molecular switches in which a contraction/extension motion would be triggered by intramolecular π-dimerization of viologens, quaternized derivatives of 4,4'-bipyridines (4,4'-bipys), or naphthalene diimides (NDIs). First, 4,4'-bipy derivatives were functionalized to interact with a highly oriented pyrolitic graphite surface in order to develop a redox-triggered bis-viologen cyclophane that could be adsorbed on graphite. Subsequently, the synthesis of a helical molecular switch possessing spiroborate-like bonds was attempted starting from ligands containing 4,4'-bipy or viologen units. This edifice would be reversibly contracted or extended by intramolecular π-dimerization of redox units. Finally, the last chapter presents titanium(IV) assemblies constructed from ligands with 4,4'-bipys or NDIs spacers. The length of the ligands, their flexibility and the possible addition of nitrogenous auxiliary ligands were studied and their impact on the nature of the edifices formed are discussed.</dcterms:abstract>
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