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<dc:title xml:lang="fr">Multi-photochromic architectures : from structure to function</dc:title>
<dcterms:alternative xml:lang="en">Architectures multi-photochromiques : structures et fonctions</dcterms:alternative>
<dc:subject xml:lang="fr">Multi-photochromisme</dc:subject>
<dc:subject xml:lang="fr">In-situ photoswitching</dc:subject>
<dc:subject xml:lang="fr">Interfaces</dc:subject>
<dc:subject xml:lang="fr">Microscopie à effet tunnel</dc:subject>
<dc:subject xml:lang="en">Multi-photochromic</dc:subject>
<dc:subject xml:lang="en">In-situ photoswitching</dc:subject>
<dc:subject xml:lang="en">Interfaces</dc:subject>
<dc:subject xml:lang="en">Scanning tunnelling microscopy</dc:subject>
<dc:subject xml:lang="en">Self-assembly</dc:subject>
<dc:subject xml:lang="en">Gold nanorods</dc:subject>
<dc:subject xml:lang="en">Fluorescence photoswitching</dc:subject>
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<tef:elementdEntree autoriteExterne="061554634" autoriteSource="Sudoc">Interrupteurs moléculaires</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">L’objectif de cette thèse a été axé sur le développement des systèmes capable de répondre à des stimuli externes, basés sur des unités photochromiques. Le but d’une telle quête est d’augmenter la complexité des dispositifs et des machines moléculaires synthétiques. Avec l’objectif de développer des dispositifs et des machines artificiels plus complexes, nous avons réalisé de systèmes comprenant de multiples interrupteurs moléculaires. En vue de la réalisation de cette thèse, des nouveaux systèmes multi-photochromiques, où hybrides photochrome/nanomatériaux contenant des fragments azobenzène, diaryléthène ou spiropyrane ont été réalisés et étudiés. D’abord, on s’est focalisés sur des systèmes multi-azobenzènes capables de subir de grands réarrangements géométriques lors de la photoisomérisation, ils pourraient être utilisés à l'avenir comme éléments constitutifs des matériaux host-guest ou metal-organic frameworks contrôlables par des stimuli lumineux. Dans un second exemple, des commutateurs photochromiques de type dithiényléthène ont été utilisés pour déclencher l'émission d'une porphyrine. Cette dyade à montré une modulation réversible de son émission, affichant un contraste particulièrement élevé. Comme dernier exemple, un dérivé de spiropyrane a été combiné avec des nanoparticules d’or anisotropes. En induisant l'isomérisation de l’interrupteur moléculaire dans les dispersions colloïdales des nanorods d’or en liquide, nous avons visualisé une grande variation du spectre d'extinction des colloïdes, dépendante de la longueur d’onde du mode LSPR et du recouvrement spectrale avec le photoswitch.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The aim of this thesis has been to develop systems capable of responding to external stimuli, based on photochromic units. The goal of such a quest is to increase the complexity of devices and synthetic molecular machines. With the goal of developing more complex artificial devices and machines, we have realised systems containing multiple molecular switches. For the realisation of this thesis, new multi-photochromic systems, or photochromes/nanomaterials hybrids containing azobenzene, diarylethene or spiropyran moieties have been realised and studied. Firstly, we focused on multi-azobenzene systems capable of undergoing large geometric rearrangements during photoisomerisation, as they may be used in the future as constituent elements of host-guest or metal-organic frameworks controllable by luminous stimuli. In a second example, dithienylethene-type photochromic switches have been used to trigger the emission of a porphyrin. This dyad exhibited a reversible modulation of its emission, displaying a particularly highly contrasted response. As a final example, a spiropyran derivative has been combined with anisotropic gold nanoparticles. By inducing the isomerisation of the molecular switch in the AuNR colloidal liquid dispersions, we visualised a large variation of the colloid extinction spectrum, dependent on the LSPR mode wavelength and the spectral overlap with the photoswitch.</dcterms:abstract>
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