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<dc:title xml:lang="en">The pillar [5] arene as a polyfunctional core for the development of molecular materials</dc:title>
<dcterms:alternative xml:lang="fr">Le pillar[5]arène comme coeur polyfonctionnel pour l’élaboration de matériaux moléculaires</dcterms:alternative>
<dc:subject xml:lang="fr">Chimie click</dc:subject>
<dc:subject xml:lang="fr">Cristal liquide</dc:subject>
<dc:subject xml:lang="fr">Pillar[5]arène</dc:subject>
<dc:subject xml:lang="fr">Rotaxane</dc:subject>
<dc:subject xml:lang="fr">Porphyrine</dc:subject>
<dc:subject xml:lang="fr">Chimie supramoléculaire</dc:subject>
<dc:subject xml:lang="en">Click chemistry</dc:subject>
<dc:subject xml:lang="en">Liquid crystal</dc:subject>
<dc:subject xml:lang="en">Pillar[5]arene</dc:subject>
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<tef:elementdEntree autoriteExterne="028963989" autoriteSource="Sudoc">Porphyrines</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La préparation de briques élémentaires de pillar[5]arènes « clickables » nous ont permis de construire des édifices moléculaires complexes, en greffant différents groupements fonctionnels autour du coeur macrocyclique. Dans ce contexte, des nouveaux dérivés du pillar[5]arène présentant des propriétés cristaux-liquides ont été synthétisés en greffant du p-dodecyloxybenzoate ou encore des dendrons de type percec. D’autres part, des dérivés pillarèniques portant des unités de porphyrines ont été préparés à partir du squelette « clickable » pillar[5]arène et de porphyrines de Zinc portant des fonctions alcynes vrai. Les études de ce système par RMN du proton à des températures variables ont permis de mettre en évidence un équilibre conformationnel dynamique conduisant au repliement des molécules. Ceci a été expliqué par une complexation intramoléculaire des porphyrines de Zinc par les groupements 1,2,3-triazole. Finalement un support « clickable » detype [2]rotaxane comportant une porphyrine base libre comme bouchon, a été préparé et ensuite fonctionnalisé par dix porphyrines de Zinc permettant l’obtention d’un dispositif supramoléculaire photoactif.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Clickable pillar[5]arene building blocks have been used for the efficient grafting of peripheral subunits onto the macrocyclic core. New liquid-crystalline pillar[5]arene derivatives have been prepared by grafting either p-dodecyloxybenzoate groups or percec-type dendrons on the macrocyclic scaffold. On the other hand, pillar[5]arene derivatives bearing peripheral porphyrin subunits have been efficiently prepared from the clickable pillar[5]arene building block and Zn(II)-porphyrin derivatives bearing a terminal alkyne function. Owing to an intramolecular complexation of the peripheral Zn(II)-porphyrin moieties by 1,2,3-triazole subunits, an original dynamic conformational equilibrium leading to a folding of the molecules has been evidenced by variable temperature 1H NMR studies. Finally, a clickable [2]rotaxane scaffold incorporating a free-base porphyrin stopper has been prepared and functionalized with ten peripheral Zn(II)-porphyrin moieties to afford a sophisticated photoactive supramolecular device.</dcterms:abstract>
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