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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 85 for “"Electron donors"”.
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Studies on organic electron donors and their applications in chemistry
Electron transfer reactions using organic donors have been and are still successfully applied in the Murphy group to perform reductions usually requiring heavy metals. This thesis focuses on several organic electron donors used to: (i) promote the cross-coupling reaction between aryl halides and …
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Super electron donors powerful reductions performed by neutral organic molecules
… the ability of organic molecules to transfer electrons and is based on the recent development within the Murphy group of a novel organic molecule, called Super-S.E.T. reagent 1, that allows the reduction of unactivated aryl and alkyl iodides. My study investigates the scope of donor 1 as a …
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Broadening the scope of reactivity for neutral organic electron donors
… has been shown to be a powerful neutral organic electron donor capable of the reductive bond cleavage of various σ-bonds. Photoactivation of donor A (to A*) has been discovered to increase the reducing power of the species therefore allowing the reduction of less activated bonds and this body of …
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Evaluation of Alternative Electron Donors for Denitifying Moving Bed Biofilm Reactors (MBBRs)
… nitrogen levels approaching 3 mg/L, alternative electron donors could promote more rapid MBBR startup/acclimation times and increased cold weather denitrification rates. Bench-scale MBBRs evaluating four different electron donor sources, specifically methanol, ethanol, glycerol, and sulfide …
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Exploring new reactions with Organic Electron Donors and the complexities of the Birch reduction
… recently been achieved with photoactivated super-electron donor (SED). These include (but are not limited to) C-O bonds of benzylic ethers and esters, C-N bonds of benzylic sulfonamides and aromatic amides. This work has successfully widened the substrate scope of reduction by SED to include i) …
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Correlation of Structure and Magnetic Properties in Charge-Transfer Salt Molecular Magnets Composed of Decamethylmetallocene Electron Donors and Organic Electron Acceptors
… dicyanofumarate (DiPrDCF) have been used as one-electron acceptors in the synthesis of charge-transfer salt magnets with decamethylmetallocenes, MCp*2 (M = Mn, Cr). Salts of each acceptor with each metallocene have been characterized and the structures of the chromium analogues have been solved. …
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Comparison Of Denitrification Potential Around A Tile Drain And In Aquifer Sediments: Oakes, ND
… bacteria capable of mediating the reaction, and electron donors for the bacteria to use in the redox reactions. The critical factor for aquifer denitrification is the concentrations of electron donors. Without an adequate supply of electron donors, bacteria cannot reduce concentrations of either …
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Possible Groundwater Denitrification in the Decorah Formation (Middle Ordovician)
… contaminated with nitrate. The shale may contain electron donors for denitrification in the forms of organic carbon and sulfur minerals. </p><p>Three shallow monitoring wells were installed and sampled, and sediment samples collected and analyzed to determine if denitrification is occurring within …
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Modeling Groundwater Denitrification by Ferrous Iron Using PHREEQC
… by the abundance of biologically available electron donors. Thus, understanding the natural denitrification capacity of aquifers, through the analysis of all the major electron donors, is essential. </p><p>A better way to estimate groundwater denitrification reactions is to compute the mass …
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Electron donor contributions to denitrification in the Elk Valley Aquifer, North Dakota
… N/L/day for the six tests. In general, the major electron donors for denitrification are organic carbon (OC), pyrite (FeS2), and ferrous iron silicate minerals. In the EVA tracer tests, increases in sulfate indicated that the oxidation of pyrite explained a significant of the denitrification. The …
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Correlation of Electron Donor Concentrations in Sediments with Sediment Properties: New Providence, Iowa
The concentrations of electron donors in aquifer sediments are important in understanding the fate and transport of redox-sensitive constituents in ground water, such as nitrate. In this study, 50 sediment samples were collected from below the water table from 11 boreholes at the US Geological …
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In-situ measurement of denitrification in the Elk Valley aquifer
… carbon is often considered the most important electron donor for the chemical reduction of NO₃¯ into harmless nitrogen gas. However, several studies have shown that inorganic electron donors in the form of FeS₂ and Fe₂⁺ participate in denitrification as electron donors. The intent of this study …
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Nematic liquid crystals for nano-structured organic photovoltaic
… structure were identified as potential electron donors in combination with perylene based compounds as electron acceptors.Time-of-flight was used to study the charge transport of organic semiconductors in this thesis. The nature of the functional groups of the molecules was found to have …
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Synthesis, non-linear optical and electrochemical properties of novel organoimido polyoxometalate derivatives
… functionalised with pyrrole and carbazole donors that can be electropolymerized to form potentially redox switchable, photoactive films. These are the first reported POM-containing electropolymers with a covalently attached POM, and indicate the potential of these materials for …
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Evaluation of in situ biodegradation of perchlorate in a contaminated site
… by at least three factors: the absence of electron donors, the presence of high levels of nitrate, and high salinity levels.
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Productivity, metabolism and physiology of free-living chemoautotrophic Epsilonproteobacteria
… (25 MPa, 24°C) with various combinations of electron donors/acceptors (H2, O2 and NO3 and 13HCO3) as a tracer to track carbon fixation. During short (18-24 h) incubations of low-temperature vent fluids from Crab Spa (9°N East Pacific Rise), the concentration of electron donors/acceptors and …
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Isolation and Ecology of Bacterial Populations Involved in Reductive Dechlorination of Chlorinated Solvents
… supported by acetate, hydrogen or pyruvate as electron donor. Chloroethene-dechlorinating populations have been shown to have distinct electron donor requirements. However, none of previously described chlorinated ethene degrading population can use both, acetate and hydrogen, as electron …
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Productivity, metabolism and physiology of free-living Chemoautotrophic Epsilonproteobacteria
… (25 MPa, 24°C) with various combinations of electron donors/acceptors (H₂ , O₂ and NO₃- and ¹³HCO₃-) as a tracer to track carbon fixation. During short (18-24 h) incubations of low-temperature vent fluids from Crab Spa (9°N East Pacific Rise), the concentration of electron donors/acceptors …
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The microaerophilic nature of <i>Wolinella recta, Wolinella curva, Bacteroides ureolyticus</i>, and <i>Bacteroides gracilis</i>
… under anaerobic conditions unless provided with electron acceptors such as fumarate and nitrate. They exhibited 0₂ uptake with H₂ or formate as electron donors (<i>W. recta</i> showed only a low O₂ uptake with H₂). Oxygen uptake was inhibited by KCN and 2-heptyl-4-hydroxyquinoline N-oxide. The …
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Synthesis and Optical Properties of Four Oligothiophene-Ruthenium Complexes and Synthesis of a Bidentate Ligand for C-F Bond Activation
… chemistry. The combination of photon-activated electron donors with electron acceptors provides a strong platform for the study of optical devices. A series of four oligothiophene-ruthenium complexes has been synthesized. Variation in oligothiophene length and bipyridine substitution allowed …
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