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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 16 of 16 for “"Oxygen Atom Transfer"”.
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Oxygen atom transfer with manganese-exchanged metal-organic frameworks
Oxygenates represent some of the most versatile commodity chemicals, justifying continued interest in the discovery of new selective oxidation catalysts from both a fundamental and applied perspective. Metal-organic frameworks (MOFs) are an attractive platform for catalysis because they enable …
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Oxygen Atom Transfer Reactions Catalyzed by Molybdenum and Tungsten Oxo Transferase Mimics
… molybdenum and tungsten enzymes to mediate oxygen atom transfer (OAT) reactions, which are critical in biological redox processes. Despite their efficiency, the development of synthetic analogues that replicate these functions remains an evolving field with vast potential in oxidation …
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Mechanistic Investigations of Hydrogen and Oxygen Atom Transfer Reactions by Manganese-Oxygen Species
… such as cytochrome P450 and manganese lipoxygenase (Mn-LOX), act as oxidants to perform essentially challenging reactions by activating dioxygen. These reactions commonly feature high-valent metal-oxygen species as key intermediates responsible for the transfer of a hydrogen or oxygen atom …
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Studies of the mechanism of oxygen atom transfer from molecular oxygen to iridium-coordinated cyclooctadiene
… by three terminal (P$\sb3$O$\sb9$)$\sp{3-}$ oxygen atoms, an olefinic C=C bond, and the carbon and oxygen atoms of an oxametallacyclobutane ring. The structures a and e are related by insertion of an O atom into a C-Ir bond of a. The structures of e and f are related by proton transfer from …
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Mechanistic studies of photo-induced proton-coupled electron transfer and oxygen atom transfer reactions in model systems
… to undergo photo-induced proton-coupled electron transfer (PCET) and oxygen atom transfer (OAT) reactions, both of which are important to energy conversion chemistry (Chapter I). The effect of coupling proton transfer (PT) to electron transfer (ET) depends on their spatial configuration, thus …
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Understanding the Role of Ligand Oxidation State: Design, Synthesis, and Reactivity of Electronically Asymmetric Molybdenum Dithiolene Complexes
… cofactor. The majority of these enzymes catalyze oxygen atom transfer reactions that are concomitant with a transfer of two-electrons. We are hypothesizing that by altering the oxidation states of the dithiolene, the reactivity of the cofactor can be tuned for different substrates. This …
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Ligand field considerations for the reactivity of high valent metal-oxo complexes and of bimetallic HX splitting photocatalysts
… formation step required for water oxidation to oxygen. The second reaction considered is the photocatalytic generation of hydrogen and halogen from hydrohalic acid. Regarding the O-O bond formation process, terminal metal oxo complexes of pseudotetrahedral geometry were synthesized and studies …
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The coordination and atom transfer chemistry of titanium porphyrin complexes
… are described. Also described are intermetal oxygen atom transfer reactions involving titanium(IV) and titanium(III) porphyrin complexes. The [eta][superscript]2-alkyne complexes, (TTP)Ti([eta][superscript]2-R-C≡C-R[superscript]') (where R = R[superscript]' = Me, Et, Ph; R = Me, …
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Campylobacter jejuni Periplasmic Nitrate Reductase NapA as a Medium for Elucidating Molybdenum Cofactor Reactivity
… within many gram-negative bacteria and catalyzes oxygen atom transfer reactions. NapA utilizes nitrate as a terminal electron acceptor in place of oxygen in low-air conditions, such as in the human gastrointestinal tract. Within the scope of this thesis, NapA from Campylobacter jejuni is primarily …
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Distal hydrogen-bonding effects and cofacial bimetallic salen architectures for oxygen activation chemistry
… designed to study the proton-coupled electron transfer chemistry of 0-0 bond forming and activation chemistry. The "Hangman" architecture is composed of hydrogen-bonding functionalities poised over a redox active manganese salophen or salen platform. The complexes proved to be proficient …
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Redox-active ligand uranium complexes for approaches to multi-electron chemistry
… PhE-EPh, PhE-X) and four electron (Ar-N=N-Ar’, oxygen-atom transfer reagents) organic oxidants have been studied. with both radical and concerted addition pathways operable. Synthesis of a <em>trans</em>-dioxo species, Cp*UO2(MesPDIMe), has allowed for the study of the activation of the robust …
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Ligand Cooperative Iridium PCP Complexes for Small Molecule Activation
… via double C-H activation at the central carbon atom, resulting in a carbene donor which can be used in favorable metal-ligand cooperative processes. This design feature was used for the activation of N2O, where a series of “iridaepoxide” complexes were made through oxygen atom transfer to the …
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Development of oxorhenium complexes and bimetallic Re-Pd/C catalysts for perchlorate reduction in water
… precursor for a highly active metal center for oxygen atom transfer (OAT) reaction with ClO4-. Aqueous immobilization of Re(O)(hoz)2Cl into Pd/C yields the hybrid catalyst Re(hoz)2−Pd/C, which shows the highest activity reported to date for reducing aqueous ClO4- to Cl- at room temperature using …
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I-Kinetic And Mechanistic Investigations Of Amino Acid Substrates Reactivities With Ferryl Species
… of tryptophan substrate with N4Py ferryl and an oxygen-atom transfer mechanism was proposed for the reaction of methionine substrate with N4Py ferryl species. The reactivity of the five significantly reactive amino acid substrates (Cys, Tyr, Trp, Met and Gly) amino acid substrates was …
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Development of a sustainable water treatment technology for oxyanions using palladium-based catalysts: catalyst design, reaction mechanisms, and life cycle assessment
… reduction of perchlorate involving a series of oxygen atom transfer reactions between rhenium species and perchlorate. Results from the 2nd study showed catalytic treatment using Re- ii Pd/C catalyst has a higher (ca. 4,600 times) environmental impact than other perchlorate treatment …
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Syntheses and studies of group 6 terminal pnictides, early-metal trimetaphosphate complexes, and a new bis-enamide ligand
… phosphide (Ar[t-Bu]N) 3MoP (16) with the potent oxygen atom transfer (OAT) reagent mesitylnitrile oxide (MesCNO). In conjunction with collaborators, the thermodynamic and kinetic aspects of MesCNO as an OAT reagent with phosphide 16 and phosphines have been investigated. Density Functional Theory …