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<dc:title xml:lang="fr">La synthèse et la catalyse de complexes organométaliques de cobalt (III) de ligands chélateurs scorpionates</dc:title>
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<dc:subject xml:lang="fr">Catalyse homogène</dc:subject>
<dc:subject xml:lang="fr">Spin-crossover</dc:subject>
<dc:subject xml:lang="en">Cobalt(III) complexes</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse porte sur la synthèse et les applications catalytiques des complexes de cobalt(III) contenant des ligands chélatants de type scorpionate. Des ligands tris(pyrazolyl)borate (Tp) ont été utilisés pour former des complexes de cobalt présentant une diversité de propriétés structurelles et électroniques. Une exploration systématique de ces complexes révèle leur potentiel dans les transformations catalytiques, notamment dans les réactions de couplage carbone-carbone. En outre, le phénomène de spin-crossover observé dans les complexes de cobalt permet des transitions dynamiques entre les états de spin élevé et de spin faible, influençant de manière significative les mécanismes réactionnels et l’efficacité catalytique. Cette propriété facilite l’activation des substrats et des intermédiaires, tout en abaissant les barrières énergétiques des étapes clés de la catalyse. Ces caractéristiques permettent des voies réactionnelles efficaces dans des conditions douces, mettant en avant le potentiel du cobalt en tant que catalyseur multifonctionnel et durable.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis focuses on the synthesis and catalytic applications of cobalt(III) complexes containing scorpionate chelating ligands. Tris(pyrazolyl)borate (Tp) ligands were utilized to form cobalt complexes with diverse structural and electronic properties. Systematic exploration of these complexes reveals their potential in catalytic transformations, particularly in carbon-carbon coupling reactions. The spin-crossover phenomenon observed in cobalt complexes allows for dynamic transitions between high-spin and low-spin states, significantly influencing reaction mechanisms and catalytic efficiency. This property facilitates the activation of substrates and intermediates, lowering energy barriers in key catalytic steps. Additionally, the oxidation of cobalt to higher oxidation states enhances its catalytic performance. These features enable efficient reaction pathways under mild conditions, highlighting cobalt's potential as a multifunctional and sustainable catalyst.</dcterms:abstract>
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