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 12 of 12 for “"Organic Radicals"”.
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Synthesis of New Molecule-Based Magnets using Bridging Organic Radicals
Several new families of organic acceptors that are candidates as building blocks of molecule-based ferrimagnets were synthesized and characterized. These families include fluorodicyanostilbenes, a tetrachlorodicyanostilbene, naphthyltricyanoethylenes, bromophenyltricyanoethylenes, and an …
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Quantum Chemical Calculations of Fermi Contact Coupling Constants In Large Organic Radicals
… for the calculation of spin densities of large organic radicals when the Rassolov-Chipman operator is utilized, while the method based on delta-function operator may lead to much less reliable results. An optimum range parameter of 0.45 is recommended.</p>
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Novel Methods to Characterise Atmospherically Relevant Organic Radicals and Reactive Oxygen Species
… is known to produce a plethora of oxidised organic compounds, which contribute to ozone formation and secondary organic aerosol production, two of the main characteristics of a polluted atmosphere. Furthermore, epidemiological studies have shown a close correlation between exposure to …
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Exciton dynamics in organic semiconductors for efficient electroluminescent devices
… exciton energy transfer and charge transport in organic semiconductors. In the first part of the thesis, ‘hyperfluorescence’, which is the concept that thermally activated delayed fluorescence (TADF) materials are exploited as an exciton sensitiser to a fluorescent emitter, is investigated. …
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Instrument and Application Development in Saturation Recovery and Rapid Scan Electron Paramagnetic Resonance
… Samarium-mediated reduction mechanisms in organic synthesis have been investigated by RS-EPR providing evidence for a radical intermediate. Spectra of organic radicals exhibiting both narrow lines and closely spaced hyperfine interactions have been recorded via RS-EPR. Well-resolved spectra …
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Very High Frequency EPR: Instrument and Applications
… Two successful methods to generate the cation radicals of these organic sulfur compounds are found. The g matrices (tensors) of the thiophenic radicals are obtained for the first time. The small differences between anisotropic components of the g matrices can be unambiguously resolved. …
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Interplay of Spin and Photophysics in Luminescent Open-Shell Molecular Semiconductors
Luminescent organic radicals are an emerging class of molecular semiconductors which exhibit many unique properties attractive for optoelectronic and spintronic devices. In this thesis, we employ optical and spin-based probes to reveal the dynamics of photogenerated excitons in a selection of novel …
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Gas-Phase Formation of Environmentally Persistent Free Radicals from Thermal Degradation of Catechol, Hydroquinone, Phenols and Tobacco
… exogenous redox cycling to form semiquinone type radicals responsible of Reactive Oxygen Species (ROS) formation. ROS such as hydroxyl radicals can cause severe oxidative stress on biological tissues and can provoke severe signaling pathways leading to cardiovascular and pulmonary dysfunctions and …
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Applications of EPR with an Emphasis on Tau Fibril Structure
… defects, natural lattice defects, solid organic radicals, radicals in solution, and spin-labeled proteins were analyzed using CW, pulse, and rapid scan EPR to compare methods. Studies of solid BDPA, E' in quartz, N<sub>s</sub><sup>0</sup> in diamond, and a-Si:H, showed that rapid scan …
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Experimental And Theoretical Analysis Of The Electronic Behavior In Five-Coordinate Iron(iii) And Six-Coordinate Cobalt(iii) Complexes With Electroactive Phenol-Rich Ligands
… structures are able to foster phenoxyl radicals although show a sensitive dependence to both the solvent and the electrolyte system in the cyclic voltammetry. In the presence of TBAClO4 (1) exhibits a two-electron oxidation, whereas in the presence of TBAPF6 (2), , shows three distinct …
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First-principles study of radiation-induced radicals in solid-state amino acids and sugars: confrontation of density-functional calculations with experimental results
… computational study of several radiationinduced radicals of biomolecules. In particular, two specific types of molecular systems will be highlighted: amino acids and sugars. Both systems are abundantly present in the natural world and are vital to the existence of life in all its forms. Amino …
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Investigation of Factors Influencing Recombination Versus Disproportionation of Complex Radicals Formed by C-N Homolysis of Breslow Type Intermediates and Related Compounds
… It is unclear what causes these radicals to undergo recombination or disproportionation. Density Functional Theory (DFT) calculations do not provide a transition state for the recombination and disproportionation processes and therefore they cannot be used to predict the favorable …