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 8 of 8 for “"Alkyl substitution"”.
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The Photophysics and Photochemistry of a series of Phthalocyanines as Potential Photosensitisers in Photodynamic Therapy
… have been made on 3 series of novel alpha octa(alkyl-substituted) phthalocyanines. Each series is defined by the distinct non-metal or metal ion centre, silicon hydroxide, zinc(II) and palladium(II). It is well documented that the phthalocyanine molecule possesses several distinct properties, …
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Ultrafast excited state reaction dynamics in light-driven unidirectional rotary molecular motors and fluorescent protein chromophores
… experiments focused on determining the effect of alkyl substitution upon excited state dynamics of HBDI. HBDI in solution exhibits a very low quantum yield compared to the chromophore in its protein environment. Large alkyl substituents were found to shift the spectra but to exhibit only small …
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Flame Studies on Conventional, Alternative, and Surrogate Jet Fuels, and Their Reference Hydrocarbons
… fuels illustrate that the degree and position of alkyl substitution on the benzene ring have a strong effect on the reactivity of the aromatic components studied. By extending the flame propagation studies to elevated pressures up to 3 atm, it is found that the flame speed results at elevated …
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Nitrophenyl boronic acids as derivatizing agents in chromatography
… the boronate ring size, this is followed by the alkyl substitution present 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 …
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Dipyrrin complexes and their uses as self assembling materials
… consisted of three compounds with increasing alkyl substitution on the bipyrrolic core of the BODIPY. This resulted in a progressive increase in fluorescence quantum yield of the compounds in each series due to increased rotational restriction of the 8-phenyl ring along with a concurrent …
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Exploration of Transition Metal Catalyzed C−C and C−N Bond Formation to Access Synthetically Elusive Small Molecules
… is applicable to substrates with aryl and alkyl substitution at the propargyl and homopropargyl positions, and has been utilized in the synthesis of 5- and 6-membered oxasilacycles.</p> <p>N-Substituted-3-amino-4-halopyridines are valuable synthetic intermediates, as they readily provide …
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New Carbazole Based Materials for Optoelectronic Applications
… of the target compounds by introducing different alkyl substituents in the very last step of the synthesis. Yields up to 50 % can be obtained after six synthetical steps including purification of the intermediates. CV measurements showed the electrochemical stability of the novel compounds. …
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Poly(Phenylene vinylene) And Poly(Naphthalene vinylene) Derivatives for Use in Organic Light-Emitting Diodes (OLEDs)
… analyzed in this research was the effect of the substitution pattern of the phenylene units, whether para- or meta-linked. The resulting set of devices revealed that meta derivatives with alkoxy substitution on the meta-linked rings had improved performance over para-linked derivatives. The role …