Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"late transition metal"”.
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Nitrene transfer reactions by late transition metal complexes
… reactions that are catalyzed or mediated by late transition metal complexes. Sterically large, fluorinated supporting ligands are used to minimize potential side reactions. A new 1,10-phenanthroline ligand has been synthesized with 2,4,6-(CF3)3C6H2- groups in the 2- and 9-positions (1). A …
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Multidentate phosphino-alkene ligands and their late transition metal complexes
… (128), are described is this PhD thesis. The related phosphine sulphide ligands, namely dbaTHIOPHOS (137) and monodbaTHIOPHOS (149), have also been prepared. The coordination chemistry of the novel ligands was investigated with a variety of late-transition metals, including Cu, Rh, Pd and Pt. …
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Polymerization and Isomerization of Olefins using Late-Transition Metal Complexes
Late-transition metal complexes serve as efficient olefin polymerization catalysts. The mechanism of α-diimine-palladium and nickel catalyzed olefin polymerization is well understood. By understanding the fundamental steps of olefin polymerization, catalysts can be rationally designed to achieve a …
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Development of new late transition metal catalysts for the oligomerisation of ethene
… and oligomerisation of l-alkenes has stimulated interest in the use of late transition metals as catalysts for these processes.
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Late transition metal catalyzed C-N and C-C bond forming reactions
… and aryl halide substrates, as well as aryl triflates. Of practical significance was that the use of cesium carbonate as a base at 100 °C substantially increased the functional group tolerance of the method. Palladium catalysts supported by novel, bulky, electron-rich phosphine ligands are …
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Halogen-elimination photochemistry and oxygen-activation chemistry of late transition-metal complexes
… chemistry are studied on mono- and bimetallic late transition-metal platforms. In the early chapters, studies of photochemical halogen elimination, the key energy-storing step in photocatalytic hydrogen production from HX (X = Cl, Br), are described. In the latter sections of the …
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Late transition metal bimetallics for photocatalytic hydrogen production, M-X and C-H bond activation
… design elements employed have focused on bimetallic complexes of late transition metals that exhibit an unusual two-electron mixed valence ground state. Initial studies focused on the mechanistic elucidation of the reported photocatalytic production of hydrogen from homogeneous hydrohalic …
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ACTIVATION OF AMMONIA, SECONDARY, AND TERTIARY AMINES BY GROUP IIA AND FIRST ROW MIDDLE AND LATE TRANSITION METAL ATOMS AND CLUSTERS
Activation of ammonia and amines occurs during metal vapor synthesis at cryogenic temperatures. The Group IIA metal atoms: magnesium, calcium, strontium, and barium, and the transition metal atoms: chromium, manganese, iron, cobalt, nickel, and zinc react with amines and ammonia. Copper metal atoms …
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N-Heterocyclic Carbenes of the Late Transition Metals: A Computational and Structural Database Study
… database study of the bonding in late transition metal N-heterocyclic carbene (NHC) complexes is reported. The results illustrate a metal-carbon bond for these complexes, approximately 4% shorter than that of a M-C single bond found in metal alkyl complexes. As a consequence of …
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Improved Synthesis, Separation, Transition Metal Coordination and Reaction Chemistry of a New Binucleating Tetraphosphine Ligand
… and oxidative cleavage reactions catalyzed by late transition metal complexes. Previously reported results are summarized here. Mechanistic aspects of alkene hydration catalyzed by late transition metal complexes are also explained. The second part of Chapter 1 focuses on motivation for using …
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Synthesis of Electron Deficient N-heterocyclic-carbenes and Activity of Imidazol-2-imine Thioureate Ligand on Group 10 Transition Metals
… imidazol-2-imine thioureate ligands (L’) to late transition metal. Three complexes were synthesized. Ni(methylallyl)L’ (7), Pd(allyl)L’ (8), and NiL’2 (9) were isolated in 85, 85, and 61% yields, respectively and all spectroscopically characterized. The X-ray crystallographic structure of 9 …
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COMPLEXES OF GROUP 10 METALS WITH NON-CLASSICAL AND THIOETHER-FUNCTIONALIZED N-HETEROCYCLIC CARBENE LIGANDS
… part describes the electronic structures of 14 related N-heterocyclic carbene ligands, and their binding to early and late transition metal fragments, which has been studied by means of DFT calculations. In the second part, the donor strengths of pyrazole ligands has been determined and correlated …
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Bildung und Nutzung multinuklearer Titanocenkomplexe mit N-heterocyclischen Brückenliganden
… reactions of titanocene sources and higher anellated aromatic N-heterocycles have been investigated and the properties of resulting products were described from different points of view. Quinoxalines and quinolines have been shown to undergo dehydrogenative C-C coupling reactions to produce …
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Synthesis, Structure, and Reactivity of High-Nuclearity Carbido Clusters of Rhenium
… reacts with late transition metal-based electrophiles to yield the mixed-metal clusters (Re$\sb7$C(CO)$\sb{21}$ML$\sb{\rm n}\rbrack\sp{2-}$ and with H$\sp+$ to yield the hydrido species (HRe$\sb7$C(CO)$\sb{21}\rbrack\sp{2-}$. These complexes have been fully …
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Phenazine: A Building Block for Multinuclear and Heterometallic Complexes, Where the Ligand Acts as an Electron Acceptor and Radical Abstractor
… of phenazine ligand is mostly limited to the late transition metal and f - element complexes. Our laboratory has a rich backgroung in the aluminum and early transition metal chemistry. The aluminum chemistry and early transition metal chemistry are of great interest since aluminum and early …
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Synthesis, Characterization And Reactivity Studies Of Nickel Complexes Supported By A Phosphinimine-Based Pincer Ligand
… to stabilize highly reactive species, including late transition metal complexes with metal–ligand multiple bonds. Herein, we report a series of novel nickel complexes supported by a pincer-type bis(phosphinimine) ligand framework {HN(1,2-C6H4N=PPh2Me)2}. Metalation of the ligand onto NiCl2(dme) …
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Group 10 Metal Catalytic Olefin Polymerization and Synthesis of Ethylene/Acrylate Block Copolymers
… This dissertation focuses on developing group 10 metal catalysts for olefin polymerization and synthesis of ethylene/acrylates block copolymers. The distorted sandwich α-diimine Pd catalyst development exhibited high catalytic activity and living ethylene polymerization at low-pressure conditions. …
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Synthesis and Application of Air-Stable Secondary Phosphine Oxide, Oxime, and Amine-Phosphine Palladium(II) Complexes in Transfer Hydrogenation and Cross-Coupling Reactions
… catalysis using organocatalysts and organometallic compounds has generated increased interest in homogeneous systems. Organometallic compounds offer higher specific activities and selectivity in comparison to traditional heterogeneous systems. These qualities make homogeneous catalysis …
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Ultraconformal chemical vapor deposition and synthesis of transition metal nitride films
… to conformally deposit stoichiometric and pure metallic films of hafnium diboride and iron in high AR features. By achieving high precursor pressure, growth rate saturation is maintained deeply into structures. CVD has a growth rate advantage over atomic layer deposition in high AR features. …
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