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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 67 for “"fluorene"”.
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Bioavailability of sediment-sorbed fluorene
… investigate the biodegradation and desorption of fluorene, a 3 ringed polynuclear aromatic hydrocarbon (PAH), in estuarine sediment-water slurries. Adsorption of fluorene to sediments with 1.4% organic carbon was characterized with a linear isotherm. Desorption was characterized through …
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New fluorene based materials for organic electronics
… polymers and low mass model compounds from fluorene and bithiophene building blocks. Such materials are attractive candidates for application in organic light emitting diodes (OLEDs) and organic field effect transistors (OFETs). The first part of my thesis deals with the synthesis of …
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Borafluorenes and polyborafluorenes boron doped varients of fluorene
A series of novel boron containing variants of fluorene were synthesized. Boron was incorporated synthetically via lithium halogen exchange and Grignard reaction pathways. Once incorporated, the borafluorene could be polymerized or undergo further functionalization via Yamamoto and Stille coupling …
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Synthesis Of Alkylthiol-containing Fluorene Derivatives For Gold Nanoparticle Functionalization
… methodology has been developed for attaching fluorene derivatives, containing different types of electron donating and accepting groups at the 2 and 7 positions, to gold nanoparticles of different sizes by exploiting the affinity of the thiol functional group for gold. The distance between the …
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Tailoring Fluorene-based Oligomers for micron and sub-micron sized Photopatterning
… characterization and application of well-defined fluorene oligomers for photoptatterning. Two types of fluorene oligomers are presented: pure fluorene oligomers and fluorene cooligomers incorporating various comonomers for adjusting the conductive properties towards electron and hole conduction. …
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Picosecond Time-Resolved Fluorescence Depletion Spectroscopy of Fluorene: IVR in the Excited Electronic State
… vibrational relaxation in the molecule fluorene. The results represent the first extensive study of a molecule using the technique which we have developed known as the time resolved fluorescence depletion technique. Fluorescence depletion decays and dispersed fluorescence spectra of 19 …
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Chemical Structure - Nonlinear Optical Property Relationships For A Series Of Two-photon Absorbing Fluorene Molecules
… of their nonlinear optical properties. Fluorene derivatives are particularly interesting since they possess high photochemical stability for organic molecules and are generally strongly fluorescent. By systematically altering the structural properties in a series of fluorenyl molecules, …
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Synthesis of Fluorene-based derivatives, Characterization of Optical properties and their Applications in Two-photon Fluorescence Imaging and Photocatalysis
… we have designed novel fluorophores using the fluorene moiety and modified it to tune the properties of the compounds. Chapter 2 of this dissertation reports the successful application of fluorene-based compounds in photocatalysis; a process that involves the decomposition of organic compounds …
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Method For Determination Of Singlet Oxygen Quantum Yields For New Fluorene-based Photosensitizers In Aqueous Media For The Advancement Of Photodynamic Therapy
Photodynamic therapy (PDT) has been investigated over the past three decades and is currently an approved therapeutic modality for skin cancer, the treatment of superficial bladder, early lung and advanced esophageal cancers, and age-related macular degeneration in a number of countries. In PDT, …
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Photochemical Reaction Products of Polycyclic Aromatic Hydrocarbons Adsorbed at an Air-Water Interface
… of naphthalene, acenaphthene, 9<i>H</i>-fluorene, phenanthrene and pyrene were subjected to UVB light in a bulk-phase and a thin-film reactor to assess the identity of the formed photodegradation products. To aide in the challenging analysis of these mixtures, a novel analytical technique …
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Synthesis, Characterizations, And Evaluation Of New Reactive Two-photon Absorbing Dyes For Two-photon Excited Fluorescence Imaging Applications
… applications. Specifically, [pi]-conjugated fluorene molecules, with enhanced two-photon absorbing (2PA) properties and high photostability, were prepared and characterized. Contemporary synthetic methods were utilized to prepare target fluorene derivatives expected to be highly fluorescent …
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Studies on the synthesis and the transport properties of organic materials
… m'-tolylamino)-9,9-dimethylfluorene, 2,7-bis(phenyl- m'-tolylamino)-9,9-dimethylfluorene, and 2,7-bis( p-fluorophenyl-m'-tolylamino)-9,9-dimethylfluorene have been synthesized using palladium-catalyzed reaction of the appropriate diarylamines with …
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Correlation and prediction of solubility of low vapor pressure solids in supercritical fluids
… The mixtures were hexamethyl benzene and fluorene in both ethylene and carbon dioxide, and diphenylamine in carbon dioxide. The binary attraction parameter (or"unlike pair energy parameter") of the Peng-Robinson equation was correlated with the heat of vaporization of the solid. The binary …
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Spectroscopic Studies of Chlorophyll a Complexes with Trinitro-Substituted Flourene Derivatives
… lifetime studies of chlorophyll a (Chl a) with fluorene, 2-(2,4,7-Trinitro-fluoren-9-ylideneaminooxy)-propionic acid (TFPR), 2- (2,4,7-Trinitro-fluoren-9-ylidenemethyl)-phenol, (TFPH), and 9-Isopropylidene-2,4,7- trinitro-9H-fluorene (ITNF) have been investigated. These systems were studied in …
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Tetrabenzo[a,c,g,i]fluorenylkomplexe des Titans: Synthese und Anwendungen
… fully characterized starting from the benzofused fluorene derivative tetrabenzo[a,c,g,i]fluorene. By reacting the lithium salt [Tbf][Li(THF)4] with chlorotitanium alkoxides and -phenoxides, tetrabenzo[a,c,g,i]fluorenyltitanium complexes of the general formula [(?5-Tbf)TiClx(OiPr)] (x = Cl, OiPr) …
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Microbial degradation of selected aromatic compounds in a hazardous waste site
… The five compounds--anthracene, dibenzofuran, fluorene, naphthalene, and pentachlorophenol--were contaminants found in the soil and ground water. There was degradation of the selected compounds in the subsurface soil, although the importance of biological activity was not conclusively shown. …
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Liquid crystalline semiconductors for organic electronics
… from binary mixtures of LCs. A series of fluorene-containing LCs have been synthesised for use as hole-transport, electron-transport and electroluminescent materials. Many of these materials exhibit nematic phases, which is beneficial for alignment due to the lower viscosity present in the …
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An investigation of liquid crystalline and semiconducting blends for applications in photovoltaics
… perylene based compounds as electron acceptors. Fluorene-thiophene based compounds were also identified as potential electron donors. Charge mobility was studied for several electron donor compounds with similar chemical structures. Donor and acceptor (D/A) blends were investigated and compared …
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Time-Resolved Studies of Aryl Carbenes
… in fluid solution. Irradiation of 9-diazofluorene generates a transient with an absorption maximum at 470 nm which is believed to be triplet fluorenylidene. The rate constant for formation of this intermediate was found to be 2.4 (+OR-) 0.7 x 10('9) s('-1) in acetonitrile, 2.0 (+OR-) 0.5 x …
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Effects of Grasses on the Remediation of Creosote-Contaminated Surface Soil
… and the six most prevalent PAHs, acenaphthene, fluorene, phenanthrene, fluoranthene, pyrene and chrysene were quantified. Data from four sampling periods, t=0, 9, 12 and 17 months is presented. At t=9 months, substantial loss of the five lowest molecular weight (LMW) PAHs had occurred, and the …
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