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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 “"Perylene"”.
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A synthesis of dibenzo (a,e) perylene
… [a] anthracene to dibenzo [a,e] perylene was accomplished in 38% yield using an aluminum chloride - stannic chloride catalyst. Attempts to reproduce or to improve this yield were not successful and thereafter the only product isolated was a low melting light orange solid which was …
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Precursors for perylene diimide dendrimers : synthesis and photophysics
Perylene dyes are photostable and have been used in a variety of applications. However they often display aggregation effects in the solution phase, leading to concentration-dependent electroluminescent (EL) quenching, band broadening, and/or a bathochromic shift. These phenomena not only affect …
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Perylene Diimide Molecular Glass: Investigations of Charge Transport
… using a known electron transport material, perylene diimide, and attaching it to a molecular glass in order to allow the material to be solution processed. Devices were made using a simple metal-semiconductor-metal structure and electrodes were selected to produce Schottky diodes. …
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Dimension Controlled Self-Assembly of Perylene Based Molecules
… in the synthesis and self-assembly of n-type perylene based organic semiconducting molecules into highly organized materials. Perylene based molecules used in this study are perylene diimide (PTCDI, two side-chains), perylene mono imide (m-PTCI, one side-chain), perylene tetracarboxylic acid …
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Exciton coupling and energy transfer in perylene-based systems
… mechanistic understanding of energy transfer in perylene-based systems. The investigations were performed using isomeric Donor-bridge-Acceptor systems, where perylene was used as an acceptor. Identifying the correlations between the molecular structure of the dyads and their photophysical …
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Temperature-Dependent Supramolecular Remodeling of Poly-Ether Perylene Diimides
Within the past decade, perylene diimides (PDIs) have been regarded as a class of the most investigated organic dyes, particularly studied for their photophysical and supramolecular properties. The high versatility of PDIs enables a wide ranged use in practical applications from organic …
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Ultrafast exciton relaxation in quasi-one-dimensional perylene derivatives
… films and matrix-isolated molecules of the perylene derivatives PTCDA (3,4,9,10-perylenetetracarboxylic dianhydride) and MePTCDI (N,N'-dimethylperylene-3,4,9,10-dicarboximide). Using femtosecond pump-probe spectroscopy, transient absorption spectra, excitonic relaxation in the lowest excited …
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Porphyrin Arrays and Perylene Diimide as Molecular Spintronic Components
… propagation, and relaxation behaviors in perylene diimide derivatives, meso-to-meso acetylene-bridged multi[zinc(II) porphyrin] and [copper(II) porphyrin] oligomers. Chapter one discusses a background about molecular spintronics of highly conjugated molecular wires and perylene diimide …
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Self-Organizing n-type Perylene Derivatives for Organic Photovoltaics – Synthesis, Characterization and Application
Diese Dissertation beschäftigt sich mit der maßgeschneiderten Synthese und der Charakterisierung verschiedener selbst organisierender Perylenderivate als n-Typ Halbleiter-Farbstoff zur Anwendung in organischen Photovoltaik-Bauelementen. Dabei liegt der Schwerpunkt auf zwei unterschiedlichen …
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Modifying electronic and solid-state properties of fullerenes, polycyclic aromatic hydrocarbons, and perylene diimides
… chapter focuses on developing a new series of perylene diimide acceptors and their use in organic photovoltaic active layers. Perylene diimides with previously unknown substitution patterns were synthesized with CF3 and CN groups and then isolated to isomeric purity using HPLC. Substituting …
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Thermo-Reversible Gelation Of Rod-Coil and Coil-Rod-Coil Molecules Based on Perylene Diimides
… the physical gelation of covalently attached perylene diimide (PDI) polymers during their self-assembly. With the gelators used, chain entanglement and network formation trap the solvent causing gelation. Hence, forces such as hydrogen bonding are not a requirement. We first describe the …
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Computer-assisted analysis of electron magnetic resonance spectra and the electron nuclear double resonance spectrum of isolated perylene cations
The analysis of electron paramagnetic resonance (EPR) spectra and the spectra from related techniques such as electron nuclear double resonance (ENDOR) spectroscopy, requires simulation of the experimental spectra. Simulating an experimental spectrum involves varying the values of several spectral …
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Donor-Acceptor Block Copolymers for Charge Separation at Nanostructured Interfaces
… was used as hole conductor in combination with perylene bisimide as dye and electron conductor. First, a soluble perylene bisimide monomer had to be synthesized. This was achieved by an unsymmetrical synthesis starting from the perylene-3,4:9,10-tetracarboxylic bisanhydride. For the solubility a …
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Influence of deposition parameters on morphology, growth and structure of crystalline and amorphous organic thin films : (the case of perylene and alpha-NPD)
… organic thin film growth in the case of perylene, we focus on two different topics, i.e. temperature dependence of dislocation formation in perylene films and the temperature dependence of perylene thin film growth on gold substrate. The temperature dependence of dislocation formation in …
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Structure-Property Correlation of Electron Transport Materials in Organic Devices
… (XRD). The first part of this thesis focuses on perylene imide based small molecules and polymers. The side groups of a series of N-substituted perylene bisimides (PBI) were found to play a crucial role on crystallinity and charge transport. The nature of the side groups had great impact on the …
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Development of iron (III) tetra(meso-aryl)porphyrins and N-annulated perylene diimide tethered rhenium (I) bipyridine supramolecular dyads for carbon dioxide conversion catalysis
… Three investigates a series of N-annulated perylene diimide tethered rhenium bipyridine dyads. The N-annulated perylene diimide groups were elucidated to act as a second-sphere electron-reservoir for rhenium bipyridine catalyst, where the preferred electrocatalytic pathway was governed by …
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Part~I: Determination of Quadrupole Couplings via L-Band, B(0) // B(1) EPR. Part~II: Surface Interactions of Perylene Adsorbed on Oxide Powders
Nuclei in the environment (matrix) of the radicals were also probed by ENDOR spectroscopy. Depending on the nature of the sample and experimental conditions, signals could be detected from $\sp1$H, $\sp2$D, and $\sp{27}$Al. The source and behavior of these signals are investigated with special …
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Structure-Function Relationships in Organic Charge-Transfer Complexes
… The materials of focus in these studies are perylene- 7,7,8,8-tetracyanoquinodimethane (perylene-TCNQ), dibenzotetrathiafulvalene-TCNQ (DBTTF-TCNQ), and stilbene-F4TCNQ.
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Growth, structure and morphology of organic thin films
… relatively regular molecular shape. However, for perylene there is still a lack of systematic studies on the morphology and the structure of perylene thin film. In this thesis, perylene have been used as an organic semiconductor material. The necessity to understand the growth mechanism and …
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