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.
Results
Showing 1 to 20 of 20 for “"Late-transition Metals"”.
-
Alkyl-heteroatom Bond Forming Reactions from the Late Transition Metals
… formation is a potential high value reaction in transition metal catalysis, however, only a handful of examples of this fundamental coupling reaction step have been reported. Presented in this thesis are new efforts to promote this challenging reaction. Group 9 and 10 metals bound by the pincer …
-
Variable Energy Photoelectron Spectra Of Organometallic Compounds Of The Late Transition Metals
… photon energy for organometallic molecules of late transition metals, including cobalt, rhodium, iridium, nickel, palladium, platinum, copper, and silver. Synchrotron radiation (in the range of 30 to 170 eV photon energy) and traditional helium I (21.22 eV) and helium II (40.81 eV) light …
-
Synthesis of Well-Defined N-Heterocyclic Carbene (NHC) Complexes of Late Transition Metals
… powerful electron donating properties. They bind transition metals with no need of back-donation and yield complexes with enhanced stability. The ability of NHCs to bind all metals from the periodic table, in low and high oxidation states, creates an unprecedented opportunity for the design of new …
-
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 …
-
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.
-
Thiophene derivatives of rhenium and titanium
… (HDS). These studies have typically utilized late transition metals with high d-electron counts. This thesis focuses on three areas, (i) the synthesis of high oxidation state metal-oxo derivatives of thiophene, (ii) the exploration of the reactivity of the carbon-sulfur bond in condensed …
-
Ni and Au Transition Metal Complexes in the Photocatalytic Co2 Reduction Reaction
… have been reported and commonly use expensive late transition metals. These systems are inspired by natural photosynthesis and generally combine a photosensitizer, a catalyst, and a sacrificial electron donor. This work focuses nickel and gold complexes as catalysts for photocatalytic CO¬2 …
-
Late transition metal bimetallics for photocatalytic hydrogen production, M-X and C-H bond activation
… 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 acid solution using a …
-
Exploration of mild and selective hydrozirconation reactions facilitated by zirconocene hydride catalysts generated in Situ.
… In recent decades, the surging cost of precious transition metals has prompted the search for alternative hydrometalation approaches, especially innovative methods using first-row and early transition metal catalysis. Analogously, the use of zirconium is appealing because it is earth-abundant, …
-
Exploring the Chemistry of Cyclopentadienyl-Cobalt-Cyclobutadiene (CpCoCb) Complexes and Synthesis of Side-Chain CpCoCb Polymers
… utility was explored in reaction with early and late transition metals such as Ti, Fe, Co and Ni. This resulted in the formation of bis-alkynyl metallocenes of Ti and Co and half sandwich Ni complexes featuring a pendent alkyne. Synthesis of side chain cobalt(I) polymers demonstrating the CpCoCb …
-
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. …
-
Pd-Catalyzed Cross-Coupling, High Throughput Experimentation, and Machine Learning
… agricultural applications. Since thiols and thiolates strongly bind late transition metals, previous research has focused on catalysts supported by chelating, bisphosphine ligands, which were considered less likely to be displaced during the course of the reaction. We show that by using …
-
Improvements in catalysis for the copolymerization of ethylene with polar comonomers
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
-
Divalent transition metal centers: the synthesis of new chemical vapor deposition precursors and studies of ethylene polymerization and oligomerization catalysts
Volatile transition metal complexes that contain boron hydride ligands are desirable for their potential as precursors for metal diboride films for microelectronics applications. Recently our group has discovered a new class of potential precursors in the metal complexes of the chelating …
-
Synthesis, Coordination Chemistry and Reactivity of 1H-pyridin-(2E)-ylidenes and Application of Their Transition Metal Complexes
… (PYE) ligands, their coordination chemistry with late transition metals and the application of their metal complexes in selected catalytic reactions and anticancer activity. The preparation of mono- and bidentate PYE ligands was achieved from reactions between pyridinium salts and primary amines …
-
New Pd and Cu-based catalysts for carbon-heteroatom bond formation
… cross-coupling reactions catalyzed by late-transition metals. Both palladium and copper are central to the field of transition metal-catalysis and are integral to the catalyst systems developed as part of our continual advancement in cross-coupling reactions. The first part of this …
-
Developments and applications of methods for palladium- and copper-catalyzed carbon-nitrogen bond formation
… (C-N) bond formation catalyzed by late transition metals such as palladium and copper. The first part of this thesis focuses on the use of palladium catalysis for the construction of a carbon(sp²)-nitrogen bond in the context of a biphasic continuous-flow system (Chapter 1). The …
-
Highly Efficient Catalysts for the Dimerization of α-Olefins
… activity was studied with a phosphine chelated nickel system in the presence of EtAlCl2. Very high activities of up to 52•10e6 g(dimer)/mol•h were observed with an activation ratio of 1:1000 (Ni:Al). These results are comparable to the most active literature known systems. Applying this …
-
Synthesis and reactivities of titanocene-oxo complexes and rhodium-catalyzed oxidative amidation
Oxo complexes of late transition metals have been used in a number of catalytic reactions such as C–H activation, epoxidation and water oxidation. In comparison, few studies have been published on terminal oxo complexes of group IV transition metals. The imido complexes of these metals, which are …
-
Metal-ligand cooperativity in first row transition metals: hydrosilylation catalysis and mechanistic insights
The utility of transition metal catalysts has greatly expanded the scope of organic reactions. Historically, homogenous catalysis is dominated by platinum group metals (PGMs) due to their relative high activity and stability to air when compared to the 1st row counterparts of PGMs. However, 1st row …