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<dc:title xml:lang="en">Synthesis of spin transition compounds for surface deposition</dc:title>
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<dc:subject xml:lang="fr">Transition de spin</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse de doctorat présente les résultats d'une étude expérimentale des composés à transition de spin pour le dépôt de surface. Nous nous sommes concentrés sur Fe(II) systèmes avec la configuration de d6 et leur comportement bistable ST. Dans une symétrie octaédrique le configuration d6 peut adopter deux états fondamentaux électronique différentes selon l'occupation des orbitales d scindé en exemple eg et t2g sous-ensembles. Si la différence d'énergie entre deux états est petite, alors tourner transition peut être induite par un stimulus externe. En fait, les complexes adoptent l'état haut spin ou l'état bas spin en raison de la différence d'énergie entre les orbitales (eg, t2g) et de l'énergie de répulsion interélectronique. Nous avons synthétisé et caractérisé de nouveaux ligands tridentates organiques, qui ont été utilisés comme précurseurs pour les nouveaux Fe(II) composés de coordination. Nous avons préparé des complexes Fe(II) avec et sans contre-anions.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This doctoral thesis presents the results of an experimental study of the spin transition compounds for surface deposition. We have focused on Fe(II) systems with d6 configuration and their bistable ST behaviour. In an octahedral symmetry the d6 configuration can adopt two different electronic ground states according to the occupation of the d orbitals split into the eg and t2g subsets. If the energy difference between two states is small then the spin transition can be induced by an external stimulus. In fact, the complexes adopt the high-spin state or the low-spin state by reason of energy difference between orbitals and interelectronic repulsion energy. Nine novel tridentate ligands have been synthesized and characterized; they were used as precursors for new Fe(II) coordination compounds. The SQUID magnetometry was used in studying magnetic properties of prepared complexes and the XAS technique was also applied to study magnetic properties of a neutral complex on an adhesive graphite tape.</dcterms:abstract>
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