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<dc:title xml:lang="fr">Catalyse bioinspirée et supramoléculaire</dc:title>
<dcterms:alternative xml:lang="en">Bioinspired supramolecular redox catalysis</dcterms:alternative>
<dc:subject xml:lang="fr">Chimie supramoléculaire</dc:subject>
<dc:subject xml:lang="fr">Commutabilité</dc:subject>
<dc:subject xml:lang="fr">Terpyridine</dc:subject>
<dc:subject xml:lang="fr">Isoalloxazine</dc:subject>
<dc:subject xml:lang="fr">Alloxazine</dc:subject>
<dc:subject xml:lang="fr">5-déazaalloxazine</dc:subject>
<dc:subject xml:lang="fr">Photoluminescence</dc:subject>
<dc:subject xml:lang="en">Supramolecular chemistry</dc:subject>
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<dc:subject xml:lang="en">Terpyridine</dc:subject>
<dc:subject xml:lang="en">Isoalloxazine</dc:subject>
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<dcterms:abstract xml:lang="fr">Les pinces moléculaires sont des structures qui peuvent être utilisées pour la commutation de propriétés grâce à des mouvements mécaniques à l’échelle moléculaire. Ce mouvement peut être contrôlé par l’application d’un stimulus. Les pinces comportant un motif terpyridine peuvent alterner entre une forme ouverte et une forme fermée par coordination/décoordination d’un métal. Le motif isoalloxazine est présent dans les cofacteurs flavines qui permettent d’effectuer des transferts d’électrons au sein de certaines enzymes. Les isoalloxazines présentent aussi des propriétés de luminescence qui ont été exploitées en photocatalyse. D’autres structures analogues nommées alloxazine et 5-déazaalloxazine ont aussi été étudiées comme photocatalyseurs. Ces travaux ont consisté à développer de nouvelles pinces composées d’une unité commutable de type terpyridine et de deux unités fonctionnelles avec des sous-structures alloxazines, 5-déazaalloxazine et isoalloxazines dans l’objectif de réguler l’activité photocatalytique. Leur commutabilité et ses effets sur leurs propriétés photophysiques ont été étudiés par différentes méthodes spectroscopiques (RMN, UV-Vis et fluorescence).</dcterms:abstract>
<dcterms:abstract xml:lang="en">Molecular tweezers enable the commutation of properties through mechanical movements at the molecular level. These movements can be controlled by external stimulus. Tweezers which incorporate a terpyridine subunit can switch between open and closed forms by complexation/decomplexation of a metallic ion. Isoalloxazine is a core structure present in flavin cofactors and enables electron transfer in several enzymes. Isoalloxazines have luminescent properties which can be used for photocatalysis. Related structures such as alloxazines and 5-deazaalloxazines are also structures of interest in the field of photocatalysis. This work consisted in the development of new tweezers incorporating a terpyridine as commutable unit and alloxazines, 5-deazaalloxazines and isoalloxazines as functional units with the objective to regulate photocatalytic activity. The commutability and its effects on photophysic properties were studied using several spectroscopic methods (NMR, UV-Vis and fluorescence).</dcterms:abstract>
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