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 20 for “"Electron Transfer (ET)"”.
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Molecular control of interfacial inner-sphere electron
… relies on the intimate coupling of protons and electrons to activate small molecules including 02, C0 2, and H20. The mechanistic pathways governing the proton- and electron-transfer steps are key to the efficiency of catalysis because they determine the rate and selectivity of the reaction. …
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Transient and Pulsed Electron Paramagnetic Resonance Spectroscopy on Type I Photosynthetic Reaction Centers
… have been used to study the light induced electron transfer(ET) in Type I photosynthetic reaction centers(RCs). First, pulsed EPR was used to compare PsaA-M688H and PsaB-M668H mutants of Chlamydomonas reinhardtii and Synechosystis sp. PCC 6803.The out-of-phase echo modulation curves …
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Exploring SOD1 electron transfer, heterodimerization, and hetero-amyloid formation.
… Zn Superoxide dismutase (SOD1) is an essential metalloenzyme that regulates superoxide radicals. Because SOD1 is a long-lived protein, it contains an intrinsic molecular clock, deamidation, that accumulates over time. Misfolding and aggregation of SOD1 have been linked to neurodegenerative …
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Mechanistic studies of photo-induced proton-coupled electron transfer and oxygen atom transfer reactions in model systems
… designed 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, …
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Mechanistic Studies of Vitamin B(12)-Catalyzed Dechlorination and Carbon-Carbon Bond-Forming Reactions
… forming a new carbon-carbon bond between the benzylic carbons of each coupling partner. Dimerization products were obtained in good to excellent yields for mono- and 1,1-disubstituted alkenes, and dienes containing one aryl alkene underwent intramolecular cyclization in good yields. …
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ELECTROCHEMICAL REDUCTION OF CYCLIC AND ACYCLIC BENZYL DISULFIDES
In this study, electron transfer (ET) to a series of cyclic and acyclic benzyl disulfides, compounds containing an S-S bond, were studied in N,N-dimethylformamide using the heterogeneous electrochemical techniques of cyclic voltammetry and coulometry. The cyclic disulfides were substituted 2,3- …
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Photochemical ribonucleotide reductase for the study of proton-coupled electron transfer
… radicals are synonymous with proton-coupled electron transfer (PCET), which intrinsically is a quantum mechanical effect as both the electron and proton tunnel. The caveat to PCET is that proton transfer (PT) is fundamentally limited to short distances relative to electron transfer (ET). This …
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Mechanistic Studies of Bimolecular Electron Transfer Self-Exchange Rates of Ruthenium Ammine Pyridyl Complexes Measured by NMR Line Broadening Techniques
<p>The electron transfer (ET) self-exchange rates on a series of complexes of (NH<sub>3</sub>)<sub>5</sub>Ru<sup>II/III </sup>L<sup>2+/3+</sup> in D<sub>2</sub>O (where L is a substituted pyridyl ligand) were investigated by dynamic NMR measurements. Significant rate enhancement was observed for …
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Conformationally gated electron transfer studies of iso-1-cytochrome c
… unfolded proteins can be key intermediates in metabolic processes and in aggregation diseases. Partially unfolded proteins also provide insight into the types of structures that guide/misguide the process of protein folding. Less is known about how stability affects the roughness of an energy …
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Conformationally gated electron transfer studies of iso-1-cytochrome c
… unfolded proteins can be key intermediates in metabolic processes and in aggregation diseases. Partially unfolded proteins also provide insight into the types of structures that guide/misguide the process of protein folding. Less is known about how stability affects the roughness of an energy …
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Using the Marcus Inverted Region and Artificial Cofactors to Create a Charge Separated State in <i>De Novo</i> Designed Proteins
<p>To create an efficient de novo photosynthetic protein it is important to create long lived charge separated states. Achieving stable charge separation leads to an increase in the efficiency of the photosynthetic reaction which in turn leads to higher yields of end products, such as biofuels, …
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Ultrafast electron transfer and intersystem crossing in bimetallic molecules
Increasingly, the role of electron spin is an important topic in electron transfer (ET). Coupling between the electronic, spin, and nuclear degrees of freedom play an important role in driving ET and intersystem crossing (ISC) on the ultrafast timescale. In this thesis, ultrafast optical and X-ray …
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Spectroscopic investigation of photo-induced proton-coupled electron transfer and Dexter energy transfer in model systems
… interrogation of photo-induced proton coupled electron transfer (PCET) and proton-coupled (through-bond) energy transfer (PCEnT) are presented. PCET is ubiquitous in Nature, where it is at the heart of bioenergy conversion and catalysis (Chapter I). Systems of relevance to mechanistic studies …
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Ferritin: Mechanistic Studies and Electron Transfer Properties
… One lingering question is the less than stoichiometric quantities of hydrogen peroxide detected in previous studies on animal ferritins. Extensive experimental data on identifying the species in competition for peroxide equivalents point to a surprising conclusion that H2O2 generated in the …
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Cytochrome c-DNA and cytochrome c-enzyme interactions for the construction of analytical signal chains
Electron transfer (ET) reactions play a crucial role in the metabolic pathways of all organisms. In biotechnological approaches, the redox properties of the protein cytochrome c (cyt c), which acts as an electron shuttle in the respiratory chain, was utilized to engineer ET chains on electrode …
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Structural and mechanistic studies of nickel-borate thin-film oxygen evolving electrocatalysts
… the most abundant renewable energy resource, yet its widespread use has been hampered by a lack of suitable methods to store energy from sunlight in a cheap and efficient manner. Solar driven water splitting is a promising method of storing solar energy, but a critical bottleneck in developing …
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Engineering heme-copper and multi-copper oxidases for efficient oxygen reduction catalysis
… increasing attention because of its high theoretical efficiency (over 90%). However, the actual efficiency is limited by the large overpotential (500-600 mV) of the oxygen reduction reaction (ORR), which demands a potent ORR catalyst to decrease the overpotential. Towards this goal, my thesis …
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Understanding cation catalytic effects in electron transfer reactions at molecular scale
… effects from spectator counter ions on rate of electron transfer (ET) reactions have been well-documented in both homogeneous and heterogeneous electron transfer reactions. People have found that the cation independent reaction path way is 300 times slower than cation (potassium) facilitated …
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Electrochemical Studies of Reactions in Small Volumes Less Than 1 Femto Litres.
<p>Electrochemical methods have been used to study electron transfer reactions at the interface between an aqueous phase of less than 1 femto liters in volume and a bulk organic phase. The small aqueous phase is formed at the end of a slightly recessed platinum electrode. When a negative potential …
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Fine���tuning the reduction potential of Cupredoxin proteins by altering secondary coordination sphere interactions
Electron transfer (ET) reactions are at the heart of most biological and chemical processes. This seemingly simple passing of electrons is critical for all life, as it allows for photosynthesis, respiration, synthesis of molecules, etc. This myriad of biological processes requires a similarly …