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<dc:title xml:lang="en">New transition metal complexes with functional N-heterocyclic carbene ligands for molecular activation</dc:title>
<dcterms:alternative xml:lang="fr">Nouveaux complexes des métaux de transition à ligands carbéniques fonctionnels pour l'activation moléculaire</dcterms:alternative>
<dc:subject xml:lang="fr">Carbènes N-hétérocycliques (NHC)</dc:subject>
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<dc:subject xml:lang="fr">Ligands pinceurs non-symétriques</dc:subject>
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<dc:subject xml:lang="en">N-heterocyclic carbenes (NHC)</dc:subject>
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<dc:subject xml:lang="en">Non-symmetric pincer ligands</dc:subject>
<dc:subject xml:lang="en">Transmetallation</dc:subject>
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<tef:elementdEntree autoriteExterne="167466356" autoriteSource="Sudoc">Carbènes N-hétérocycliques</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le sujet de cette thèse porte sur l’étude de ligands hybrides incorporant un donneur carbène N-hétérocyclique (NHC). Les ligands phosphine-NHC construits sur le motif m-phénylène ont conduit à des complexes di- ou tétranucléaires d’Ag, Cu, Au et Ir, et à des complexes bimétalliques Ag/Cu et Ag/Ir par transmétallation sélective du site NHC. Dans le cas des ligands phosphino-picoline-NHC (PNC), la transmétallation des sels de Li ou K correspondants a permis d’isoler des complexes « pinceurs » dé-aromatisés du Cr, Fe et Co. La déprotonation du ligand bis(phosphinométhyl)pyridine (PNP) a été examinée, et les ligands dé-aromatisés mono- et bis-anioniques correspondants ont été utilisés dans des réactions de transmétallation vers le Cr(II) et Zr(IV). Différents modes de coordination des ligands dé-aromatisés, notamment une métallation de la position alpha-CHP, ont été observés. La substitution de la phosphine dans PNC par une fonction imine conduit à un ligand hybride « rédox non-innocent ».</dcterms:abstract>
<dcterms:abstract xml:lang="en">The purpose of this work is the synthesis and study of hybrid and potentially “pincer” ligands featuring an N-heterocyclic carbene (NHC) donor. The phosphine-NHC ligands based on the m-phenylene framework led to di- or tetranuclear Ag, Cu, Au and Ir complexes, and to bimetallic Ag/Cu and Ag/Ir complexes by selective transmetallation of the NHC. With the phosphino-picoline-NHC (PNC) ligands, transmetallation from the corresponding Li or K salts led to dearomatised Cr, Fe and Co “pincer” complexes. Deprotonation of the bis(phosphinomethyl)pyridine (PNP) ligand was also examined. The corresponding dearomatised mono- and bis-anionic ligands were isolated as Li or K salts and further used in transmetallation reactions towards Cr(II) and Zr(IV). Different coordination modes of the dearomatised ligands, including side-arm metallation, were observed. Substitution of the phosphine group in PNC by an imine donor led to a hybrid and “redox non-innocent” ligand.</dcterms:abstract>
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