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<dc:title xml:lang="en">The role of open-shell environments on the spectroscopy of complex spin architectures : wavefunction-based studies</dc:title>
<dcterms:alternative xml:lang="fr">Le rôle des environnements couche ouverte dans la spectroscopie d'architectures de spin complexes : études fonction d'onde</dcterms:alternative>
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<dc:subject xml:lang="fr">Théorie de la fonction d'onde</dc:subject>
<dc:subject xml:lang="fr">Fission du singulet</dc:subject>
<dc:subject xml:lang="fr">Spinmérie</dc:subject>
<dc:subject xml:lang="en">Quantum chemistry</dc:subject>
<dc:subject xml:lang="en">Model hamiltonian</dc:subject>
<dc:subject xml:lang="en">Ab initio calculations</dc:subject>
<dc:subject xml:lang="en">Wavefunction theory</dc:subject>
<dc:subject xml:lang="en">Singlet fission</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse étudie l'influence de l'environnement sur les architectures complexes de spin. Elle se concentre sur les environnements à couche ouverte en Chimie Organique et Inorganique.Elle commence par une présentation des outils et des méthodes de calcul fonction d'onde utilisés dans ce travail.Ensuite, une étude basée sur un Hamiltonien modèle explore qualitativement l'importance des environnements dans la Fission du Singulet.Elle se concentre sur la "condition thermodynamique" et met en évidence les défauts de l'approximation du "chromophore unique".Enfin, un Hamiltonien modèle et deux études ab initio étudient l'émergence d'un nouveau phénomène : la spinmérie.Les architectures basées sur un ion métallique à transition de spin coordonné à plusieurs ligands à couche ouverte sont susceptibles de générer des états étant une superposition d'états de spin locaux. Cela bouleverse le concept de spins gelés dans les composés de coordination, en particulier dans les diagrammes de Tanabe-Sugano.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis studies the influence of the environment in complex spin architectures. It focuses on open-shell environments in the fields of Organic and Inorganic Chemistry.It starts off by introducing the basic tools and methods for wavefunction calculations used in this work.Then, a model Hamiltonian-based study qualitatively explores the importance of environments in Singlet Fission.It focuses on the so-defined "thermodynamic condition", and highlights the flaws of the "single chromophore" approximation broadly used in the experimental and theoretical community.Finally, a model Hamiltonian and two \textit{ab initio} studies investigate the emergence of a new phenomenon: \textit{spinmerism}.Architectures based on a Spin CrossOver metal ion coordinated to several open-shell ligands are likely to generate states which are a superposition of local spin states. This reshuffles the traditional frozen-spin picture in coordination compounds, in particular in the Tanabe-Sugano diagrams.</dcterms:abstract>
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