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 22 for “"aromatic molecules"”.
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Excited State Dynamics and Energy Transfer Studies of Aromatic Molecules
… this information, a series of charge transfer molecules have been designed to test if this asymmetry could lead to fast charge separation and slow charge recombination characteristics.
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Estimation method for the thermochemical properties of polycyclic aromatic molecules
Polycyclic aromatic molecules, including polycyclic aromatic hydrocarbons (PAHs) have attracted considerable attention in the past few decades. They are formed during the incomplete combustion of hydrocarbon fuels and are precursors of soot. Some PAHs are known carcinogens, and control of their …
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Approaches towards C-10-hydroxylated analogues of narciclasine
… products of the biocatalytic transformation of aromatic compounds, as precursors to ring C, and of highly oxygenated aromatic molecules to construct ring A. The document also reports a detailed account of the protocols studied for the intramolecular formation of ring B. Experimental data and …
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Photophysical properties of pyrene, 2,7 diazapyrene and 1,3-bis(β-naphthyl)propane.
… state and excited state association of these aromatic molecules.
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Designing Allosteric Inhibitors of Thrombin
… through an allosteric process mediated by small molecules binding to either exosite I or II. An appropriately designed allosteric regulator that reduces the procoagulant signal in a finely tuned manner may maintain a delicate balance between procoagulant and anticoagulant signals in blood …
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In situ studies of the binding and reactivity of small molecules at metal electrode surfaces
… encompasses several studies of the behavior of aromatic molecules on Au(111) single crystal electrode surfaces. In the first study, the initial stages of the binding and oxidation of phenol at high pH were addressed. Phenoxide binds to the electrode surface through the oxygen atom and is tilted …
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Infrared Laser Excitation and Fluorescence Spectra: A Study of Intramolecular Vibrational Energy Relaxation
… C-H stretch in twenty three representative molecules varying in size from methane to norbornene. Included are aliphatic hydrocarbons, aromatic molecules, ethers, and ketones, including cyclic molecules. The rate of resonance fluorescence, calculated relative to a non-relaxing molecule was …
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Synthesis and characterization of various ruthenium small molecules and metallopolymers for potential use in photovoltaic devices and luminescence properties of N-heterocyclic carbenes and trifluoro methylated tris(pyrazolyl)borate silver (I) acid-base adducts
… complexes coordinated to different solvent and aromatic molecules. These species have been investigated and found to exhibit unusual photophysical properties, including metal-free phosphorescence at room temperature with high quantum yield, multi-color emission from a single compound, and …
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Density Functional Theory Study of Aromatic Adsorption on Iron Surfaces
This thesis studies the adsorption behaviour of aromatic molecules on iron surfaces using density functional theory (DFT) calculations. The adsorbates studied are benzene ($C_{6}H_{6}$), naphthalene ($C_{8}H_{10}$) and quinolinium ($C_{7}H_{10}N^{+}$) as well as a molecule composed of these …
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Lignin valorization
… is the use of lignin as alternative source of aromatic building blocks and oligomers to fossil feedstocks. Lignin is known as the most abundant aromatic polymer in nature and is isolated from the lignocellulosic component of plants by different possible extraction treatments. Both the biomass …
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DNA Directed Organic Semiconductor Interactions Controlling Excitons, Charge Transfer States, and Singlet Fission
… through π-orbital interactions between multiple molecules. Hence, efficiency depends on the relative geometries between molecules. Yet, control over spatial assembly of organic semiconductors is challenging. Large aromatic molecules will self-assemble into extended structures with no size or …
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Exploiting cooperative effects in s-Block organometallics for new applications in synthesis and catalysis
… regioselective magnesiation of heterocyclic and aromatic molecules, including pyrazine or 1,2,4,5-tetrafluorobenzene, can be achieved at room temperature. Structural studies of these metallated intermediates have revealed a crucial stabilising role of the β-diketiminate ligand, which facilitates …
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The use of organotellurium heterocycles as precursors for novel organometallic compounds
… of dechalcogenation of the more condensed aromatic molecules. The potential of tellurium heterocycles to act as precursors for novel organometallics is also recognised owing to the relatively facile elimination of the heteroatom from these systems. Thus, 2-telluraindane reacts with …
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Modelling the self-assembly and structure of carbonaceous nanoparticles
… containing planar pericondensed polycyclic aromatic hydrocarbons (PAHs), is extended to include PAHs of varying sizes. The resulting nanostructures show that the classic core-shell morphology reported experimentally for mature soot particles is not energetically feasible if only considering …
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Studies of liquid phase intermolecular interactions utilizing ¹H and ¹³C dynamic nuclear polarization and nuclear magnetic resonance techniques
… in a flow transfer system for different organic molecules, such as acetone, acetaldehyde, diethyl malonate, ethyl acetoacetate, diphenylmethane, and triphenylmethane. These molecules represent a wide range of functional groups with different acidities of the respective carbon-hydrogen bonds. The …
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Nitrophenyl boronic acids as derivatizing agents in chromatography
… and the position of the nitro group on the aromatic ring. Excellent quantitative performance was obtained with flame ionization and electron capture detectors. Detection limits in the femtomole range were achieved with the EC detector. Solvent background and adsorption problems were found at …
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Theory of quantum interference in molecular junctions
… recent years, electron transport through single molecules has attracted huge attention, since the molecules are promising building blocks for the next generation of electronic devices. To create molecular junctions and probe their electrical properties, intense experimental efforts and …
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Assessment and characterization of dissolved organic nitrogen removal in simulated soil aquifer treatment systems
… of the model (C1) was attributed to the aromatic molecules of terrestrial origin and associated with humic-like compounds. Another detected component (C3) corresponded with microbial humic-like and terrestrially delivered and was reported at drinking water treatment plants. The results …
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A test-cell installation of a gas turbine engine to investigate the performance advantages of low aromatic fuel
… was to ascertain the extent to which reducing aromatic content would a ect the performance of a gas turbine. However, since no facilities existed at the Sasol Advanced Fuels Laboratory (SAFL) for jet fuels research, the rst objective was to establish a working test cell with which to complete …
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Mosquito odor receptor gene targets to alter vector host choice
… zoophilic An. quadriannulatus, AqOr9, detected aromatic molecules from the original odorant panel. AqOr9 activity was further explored in a reiterative process, of selection for molecules with structural similarities to the most activating odorants, in order to identify environmental sources …
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