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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 43 for “"Pincer"”.
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Modellsysteme für die Stickstofffixierung basierend auf Pyridin-Pincer-Liganden
… aber auch Wolfram, verwendet. Besonders mit Pincer Liganden konnten katalytisch aktive Komplexe generiert werden. Die Arbeit kann in drei verschiedene Teile aufgeteilt werden. Der erste Teil dieser Arbeit beschäftigt sich mit dem Design und der Darstellung von neuen Pincer-Liganden, welche …
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Synthesis and reactivity of Gold(ΙΙΙ) complexes with pincer ligands
… relevant gold(III) species supported by pincer ligands. The tridentate diphenylpyridine ligand was found to stabilise monomeric, terminal hydroxides of gold(III) which are reactive synthons for new metal complexes. Chapter 1 explores the chemistry of terminal gold(III) hydroxides and …
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CCC pincer iron complexes: synthesis, reactivity and parahydrogen induced polarization
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01
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Early Transition Metal CCC-NHC Pincer Complexes: Synthesis, Characterization, and Catalysis
… methodology for the metalation of CCC-NHC pincer ligand precursors has been extended to other early-transition metals and ligands. Specifically, synthetic results for the preparation of imidazole based CCC-NHC pincer Ti (IV), CCC-NHC pincer Ta (V) will be discussed. In addition, the …
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Synthesis, Characterization And Application Of Pt Complexes With Pincer Ccc-Bis(Nhc) Ligands
… route for the synthesis of CCC-bis(NHC) pincer ligand supported transition metal complexes was extended to Pt. Several platinum complexes were synthesized. The identity of these complexes was confirmed through multiple technologies, including nuclear magnetic resonance spectroscopy, mass …
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Synthesis, characterization, and catalytic reactivity of first-row transition metal CCC pincer complexes
… compared to phosphines. Combining NHCs with pincer ligand frameworks provides even more stable complexes. Therefore, we investigated a variety of monoanionic, bis(carbene), strong-field pincers with first-row transition metals. A variety of ArCCC (Ar = Mes, DIPP) and RCcCcC (R = benzyl, …
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From the reactivity of Pincer CCC nickel complexes to catalysis with simple nickel salts
The student, Gabriel Espinosa Martinez, accepted the attached license on 2018-04-16 at 11:38.
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Synthesis, Characterization And Reactivity Studies Of Nickel Complexes Supported By A Phosphinimine-Based Pincer Ligand
Tridentate pincer-type ligands offer both electronic and steric flexibility and have been used 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 …
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Catalytic hydrofunctionalization and small molecule reactivity at a low-valent cobalt center supported by a bis(carbene) CCC pincer ligand
… of cobalt derivatives of the (DIPPCCC) pincer ligand, (DIPPCCC = bis(diisopropylphenyl-benzimidazol-2-ylidene)phenyl), a platform which provides highly-donating carbenes and an aryl carbon linkage to the coordinated metal. Multinuclear NMR spectroscopies, cyclic voltammetry, X-ray …
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Supported catalysts, from polymers to gold nanoparticles supports
… that are used in this thesis, the palladium pincer complex and the palladium N-heterocyclic complex. In chapter 3, the synthesis of a soluble polymer supported catalyst is described. The polymer chosen for the study is poly(norbornene), and the catalyst is a 1,3-disubstituted benzene ligand …
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Finite Element Analysis and Validation of Hip Joints with the Main Types of Femoroacetabular Impingement
… develops at the femoral head/neck junction. A pincer impingement is where a bony protrusion develops at the acetabular rim. Often, patients are seen with a combination of both impingements. The main goal of this study was to computationally model and analyze acetabular stresses in a healthy …
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Earth-Abundant Metal Complexes Binding N-Heterocyclic Carbene-Based Ligands for the Photocatalytic Carbon Dioxide Reduction Reaction
… of Ni(II) complexes bearing tridentate CNC pincer ligand scaffold composed of two imidazole or benzimidazole-derived NHC rings and a pyridyl ring with various remote substituents (OMe, Me, H) para to the pyridine ring. A monodentate chloride ligand was also incorporated into this metal …
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Low-temperature protonation studies of transition metal alkyl complexes and the synthesis and characterization of early transition metal PCP pincer complexes and two-coordinate alkylamido complexes
… RPCP is a 2,6-bis(dialkylphosphinomethyl)phenyl pincer ligand and M is a group 10 transition metal. Complexes where R is isopropyl were prepared with nickel, palladium, and platinum. Additionally, complexes where R is t-butyl or adamantyl were prepared for nickel. Protonation of these complexes …
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Chemistry of highly reactive group 5 and 6 transition metal compounds
… the group 6 chemistry, the first [CCC] X₃-donor pincer ligand for a transition metal was synthesized by two consecutive cyclometalations of a terphenyl complex of the group 5 metal tantalum. Chapter 1 describes two new transformations that occur between W(PMe₃)₄(η²-CH₂PMe₂))H and haloarenes, …
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Electronic Effects in Multidentate Pyridinol and N-Heterocyclic Carbene Based Ligands for Transition Metal Catalyzed Carbon Dioxide Reduction
… catalysts, supported by a CNC-pincer moiety, are some of the most robust catalysts in the literature while maintaining good catalytic activity. The CNC-pincer scaffold have shown tremendous results with electronic tunability of the pyridyl N atom through para substitution of the …
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SUSTAINABLE CATALYSIS VIA IRON AND ZINC COMPLEXES: FROM TUNABLE METALLATE SYSTEMS TO PHOTOCHEMICAL REACTIVITY
… The final part of the work explores pincer type ligand frameworks as platforms for metal ligand cooperativity. A new NCN pincer ligand was designed to extend carbene based reactivity to iron, motivated by recent advances in PC(sp3)P systems. Although the targeted iron carbene …
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Sustainable catalysis using iron based catalysts for hydrofunctionalization of c=x (x = o, n) unsaturated bonds
… without the use of costly precursors. Pincer ligands are one of the most successful ligand design currently known and their precious metal complexes have been the focus of various stoichiometric as well as catalytic studies. Motivated by increased research efforts in the area of …
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