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<dc:title xml:lang="en">Multivalent systems based on viologen units : redox behaviour and recognition properties by cucurbit[n]urils</dc:title>
<dcterms:alternative xml:lang="fr">Systèmes multivalents basés sur des unites viologènes : propriétés électrochimiques et de reconnaissance par des cucurbit[n]urils</dcterms:alternative>
<dc:subject xml:lang="fr">Bipyridylium</dc:subject>
<dc:subject xml:lang="fr">Curcubit[n]uril</dc:subject>
<dc:subject xml:lang="fr">Porphyrine</dc:subject>
<dc:subject xml:lang="fr">Azo-chromophore</dc:subject>
<dc:subject xml:lang="fr">Multivalence</dc:subject>
<dc:subject xml:lang="fr">Reconnaissance</dc:subject>
<dc:subject xml:lang="fr">[n]Pseudorotaxanes</dc:subject>
<dc:subject xml:lang="fr">Physico-chimie</dc:subject>
<dc:subject xml:lang="en">Bipyridylium</dc:subject>
<dc:subject xml:lang="en">Curcubit[n]uril</dc:subject>
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<dc:subject xml:lang="en">Azo-chromophore</dc:subject>
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<dc:subject xml:lang="en">[n]Pseudorotaxanes</dc:subject>
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<tef:elementdEntree autoriteExterne="050395505" autoriteSource="Sudoc">Viologènes</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="168661829" autoriteSource="Sudoc">Chromophores</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="031472672" autoriteSource="Sudoc">Reconnaissance moléculaire</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027839524" autoriteSource="Sudoc">Oxydoréduction</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Des supramolécules basées sur la reconnaissance de viologènes par des curcubit[n]urils (CB[n]) ont été étudiées. Les systèmes développées incluent des [3]-, [4]- et [7]pseudorotaxanes, composés de multimères à base de viologène et de CB[7] ou CB[8]. L’étude physicochimique a montré que ces supramolécules sont interconverties électrochimiquement entre un état complexé, défini par les pseudorotaxanes, et un état dissocié comprenant chacun des partenaires. Le désassemblage résulte d’une pimérisation intra/intermoléculaire entre radicaux viologènes.L’étude physicochimique de complexes pentacoordinés basés sur la reconnaissance d’azo-aryl-imidazoles par une porphyrine à anse phénanthroline a été menée; l’objectif étant d’utiliser les propriétés d’isomérisation photoinduite trans-cis d’azo-chromophores pour dissocier ces complexes. Les complexes initiaux sont alors régénérés par relaxation thermique. La stabilité et les propriétés cinétiques des complexes pentacoordinés ont été évaluées.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Supramolecules based on the recognition of redox-active bipyridiniums by cucurbit[n]uril (CB[n]) have been studied. The investigated systems include a [3]-, a [4]- and a [7]pseudorotaxane, each of them composed of a multimeric viologen-based thread molecule and CB[7] or CB[8]. The physicochemical approach emphasized that these systems can be electrochemically switched between a complexed state, defined by the pseudorotaxanes, and an uncomplexed state comprising their components. The disassembly results from intra/intermolecular pimerization of the viologen radicals.A physicochemical approach of pentacoordinated complexes of a phen-strapped porphyrin with azo-arylimidazoles has been undertaken with the aim to use the photoinduced trans-cis isomerization properties of azo-chromophores to dissociate the complexes. Thermal equilibration reinstates the thermodynamically favoured complexes. The strength and the kinetic properties of these pentacoordinated species have been evaluated.</dcterms:abstract>
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