Ruthenium silane and germane complexes : synthesis, electrochemical and catalytic studies / Smart, Katharine  

Public ISBD Titre : Ruthenium silane and germane complexes : synthesis, electrochemical and catalytic studies Type de document : texte imprimé Auteurs : Smart, Katharine, Auteur ; Grellier, Mary, Directeur de thèse ; Sylviane Sabo-Etienne, Directeur de thèse Année de publication : 2013 Langues : Anglais (eng) Tags : RUTHENIUM  SILANE  GERMANE  SILAZANE  DEUTERATION  ELECTROCHEMISTRY  NEUTRON DIFFRACTION  CATALYSIS Résumé : "The activation of E - H bonds (E = Si, Ge, H) by ruthenium complexes is subjected to detailed study. The first chapter describes the preparation of novel N-heterocycle-silane compounds, their employment as ligands to ruthenium and the properties of the resulting complexes. Several classes of ruthenium-N-heterocycle-silane species were isolated including a series bearing the motif RuSi3H comprising heptacoordinated moieties with three N-heterocycle-silane ligands and a hydride. As explored in chapter 2, two degenerate systems are encountered for RuSi3H; with the hydride located equidistant from the three silicon atoms or with the hydride closer to two silicon atoms than the third. Protonation of RuSi3H led to RuSi3H2+ bearing hydride, silyl and ??-(H??Si) ligands. In chapter 3, the wide range in oxidation potentials of the RuSi3H complexes is correlated to the electronic properties of the ligands. Chemical and electrochemical oxidation of a RuSi3H species gave rise to RuSi3H2+ and possible routes accounting for the transformation are examined. The focus shifts in chapter 4 to the activation of Ge - H bonds. Complexes of the type Ru(diphosphine)2(GeH3)(H) were accessed by the photochemical reaction of GeH4 with Ru(diphosphine)2H2. Study of germane systems continued with the reaction of Ph2GeH2 and the polyhydride complex Ru(H)2(?2-H2)2(PCy3)2 giving rise to a unique dihydrogen-germylene-ruthenium complex, Ru(H)2(=GePh2)(?2-H2)(PCy3)2. It was also possible to prepare (Ph2HGe)2O from the coupling of Ph2GeH2 and water in the presence of a catalytic amount of ruthenium. The complex Ru(H)4{(Ph2Ge)2O}(PCy3)2 was also isolated and identified as a key intermediate in the generation of (Ph2HGe)2O. The final chapter describes the selective catalytic deuteration of hydridosilanes with deuterium gas. It was possible to achieve the successful deuteration of a range of silanes with very low catalyst loading." Document : Thèse de Doctorat Etablissement_delivrance : Université de Toulouse 3 Date_soutenance : 11/10/2013 Ecole_doctorale : Sciences de la matière (SdM) Domaine : Chimie Organométallique et de Coordination En ligne : http://thesesups.ups-tlse.fr/2186/ Ruthenium silane and germane complexes : synthesis, electrochemical and catalytic studies [texte imprimé] / Smart, Katharine, Auteur ; Grellier, Mary, Directeur de thèse ; Sylviane Sabo-Etienne, Directeur de thèse . - 2013. Langues : Anglais (eng) Tags : RUTHENIUM  SILANE  GERMANE  SILAZANE  DEUTERATION  ELECTROCHEMISTRY  NEUTRON DIFFRACTION  CATALYSIS Résumé : "The activation of E - H bonds (E = Si, Ge, H) by ruthenium complexes is subjected to detailed study. The first chapter describes the preparation of novel N-heterocycle-silane compounds, their employment as ligands to ruthenium and the properties of the resulting complexes. Several classes of ruthenium-N-heterocycle-silane species were isolated including a series bearing the motif RuSi3H comprising heptacoordinated moieties with three N-heterocycle-silane ligands and a hydride. As explored in chapter 2, two degenerate systems are encountered for RuSi3H; with the hydride located equidistant from the three silicon atoms or with the hydride closer to two silicon atoms than the third. Protonation of RuSi3H led to RuSi3H2+ bearing hydride, silyl and ??-(H??Si) ligands. In chapter 3, the wide range in oxidation potentials of the RuSi3H complexes is correlated to the electronic properties of the ligands. Chemical and electrochemical oxidation of a RuSi3H species gave rise to RuSi3H2+ and possible routes accounting for the transformation are examined. The focus shifts in chapter 4 to the activation of Ge - H bonds. Complexes of the type Ru(diphosphine)2(GeH3)(H) were accessed by the photochemical reaction of GeH4 with Ru(diphosphine)2H2. Study of germane systems continued with the reaction of Ph2GeH2 and the polyhydride complex Ru(H)2(?2-H2)2(PCy3)2 giving rise to a unique dihydrogen-germylene-ruthenium complex, Ru(H)2(=GePh2)(?2-H2)(PCy3)2. It was also possible to prepare (Ph2HGe)2O from the coupling of Ph2GeH2 and water in the presence of a catalytic amount of ruthenium. The complex Ru(H)4{(Ph2Ge)2O}(PCy3)2 was also isolated and identified as a key intermediate in the generation of (Ph2HGe)2O. The final chapter describes the selective catalytic deuteration of hydridosilanes with deuterium gas. It was possible to achieve the successful deuteration of a range of silanes with very low catalyst loading." Document : Thèse de Doctorat Etablissement_delivrance : Université de Toulouse 3 Date_soutenance : 11/10/2013 Ecole_doctorale : Sciences de la matière (SdM) Domaine : Chimie Organométallique et de Coordination En ligne : http://thesesups.ups-tlse.fr/2186/

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