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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 11 to 20 of 151 (0.156 seconds)Spelling suggestions: "subject:"organischen bohemie"" "subject:"organischen alchemie""
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Nahgeordnete Bisdiazene Synthesen, Photochemie, Elektrochemie: In-Plane sigma-Delokalisierung in 4N-Ionen /Vögtle, Markus. January 2001 (has links)
Freiburg, Univ., Diss., 2001.
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Milieueinflüsse auf die Kinetik der Dimerisierung von Cyclopentadien zum Endo-DicyclopentadienKönig, Friedhelm, January 1981 (has links)
Thesis (Doctoral)--Justus-Liebig-Universität Giessen, 1981.
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Beitrag zur Implementierung des Leitbildes "Nachhaltige Entwicklung" in die ChemieausbildungDiehlmann, Achim. Unknown Date (has links) (PDF)
Universiẗat, Diss., 2002--Jena.
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Untersuchung helikal-chiraler Polymethacrylate als Liganden für die asymmetrische ÜbergangsmetallkatalyseHoffart, Timo. Unknown Date (has links)
Techn. Universiẗat, Diss., 2006--Darmstadt.
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Preparation of novel bitumen nanocomposites out of polymer-modified montmorillonite nanoparticlesBelke, Eduard 02 August 2017 (has links)
To extend the time of service of asphalt roads modified montmorillonite nanoparticles were incorporated into bitumen with the aim of creating a gas barrier inside the bitumen which slows down the diffusion of oxygen through the bitumen. For this purpose [montmorillonite/alkyl-quat-primer] adducts ([MMT/PEI(nkD)xQyR]) were fabricated in which single-montmorillonite platelets were coated by a ultrathin polymer film by reacting montmorillonite particles with poly(ethylenimine) based polycations. The alkyl-quat-primer polymers were synthesised by adding ammonium groups and alkyl chains to hyperbranched poly(ethylenimine)s in a solvent-free reaction. Adducts with fully intercalated polymers were obtained when the polymers were reacted with an aqueous solution of [MMT/CTAB] or by mixing the polymers with montmorillonite and CTAB in an aqueous solution. The polymers replaced the CTAB in an intermediate formed [MMT/CTAB] adduct and adhered strongly to the montmorillonite due to a cooperative electrostatic interaction between the positively charged ammonium moieties of the macromolecules and the negatively charged montmorillonite surface. [MMT/alkyl-quat-primer] and [MMT/CTAB] adducts were incorporated via a single screw extruder into polymer- and non-polymer-modified bitumina to create bitumen-nanocomposites. Composites prepared under optimised conditions exhibited an adduct network inside the bitumen at adduct concentrations larger 5 wt.% and when non-polymer modified bitumina were modified. The aspect ratio of the incorporated montmorillonite platelets depended strongly on the adduct composition and the used bitumen, and was with [MMT/PEI(10kD)10Q80R10] adducts were very high (~ 300 - 1000) but with [MMT/PEI(10kD)10Q60R14] and [MMT/CTAB] adducts considerably lower (~ 30 - 90).
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Organic Thin-Film Transistors Based on Dipolar Squaraine Dyes / Organische Dünnschichttransistoren von dipolaren SquarainfarbstoffenGsänger, Marcel January 2013 (has links) (PDF)
In summary, it can be stated that the herein studied set of acceptor-substituted squaraine dyes can be seen as potent candidates for OTFTs. Furthermore, their transistor performance can be easily tuned to obtain hole mobilities up to 0.45 cm2/Vs from solution and 1.3 cm2/Vs from sublimation by choosing adequate deposition techniques. In the end, a probable structural model derived from studies of the thin-film morphology by methods such as optical spectroscopy, AFM and X-ray even facilitated the clarification of the observed charge transport behavior. / Zusammenfassend lässt sich sagen, dass die in dieser Arbeit untersuchten akzeptorsubstituierten Squarainfarbstoffe durchaus als leistungsfähige Kandidaten für den Einsatz in OTFT-Bauteilen angesehen werden können. Ihre Transistorleistung lässt sich durch geeignete Wahl der Abscheidungsmethode dahingehend einstellen, als dass sich Lochmobilitäten von bis zu 0.45 cm2/Vs mittels Lösungsprozessierung und von bis zu 1.3 cm2/Vs mittels Sublimation realisieren lassen. Schließlich ermöglichte die Untersuchung der Dünnfilmmorphologie mit Methoden wie der optischen Spektroskopie, Rasterkraftmikroskopie und Röntgenbeugung die Schlussfolgerung auf ein mutmaßliches Strukturmodell.
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Einblicke in die Spinchemie durch Untersuchung des Magnetfeldeffektes in rigide gebundenen Radikalionenpaaren / Insights into the field of spin chemistry by studying the magnetic field effect in rigidly bound radical ion pairsMims, David January 2023 (has links) (PDF)
Synthese starrer Donor-Akzeptor-Verbindungen und Untersuchung des Magnetfeldeffektes auf Lebenszeit resultierender Biradikale mittels optischer Spektroskopie. / Synthesis of rigid donor-acceptor compounds and investigation of the magnetic field effect on the lifetimes of resulting biradicals using optical spectroscopy.
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Untersuchungen zur Synthese von Yohimban- und Campthoteca-Alkaloiden durch Domino-Knoevenagel-Hetero-Diels-Alder-Reaktion / Efforts toward the total synthesis of yohimban and campthoteca alkaloids via domino Knoevenagel-hetero-Diels-Alder reactionKlapa, Katharina Anna 17 January 2007 (has links)
No description available.
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Synthesis of Potentially Biologically Active Cyclopropane- and Spirocyclopropane-annelated Oligoazaheterocycles / Synthese von potentiellen biologischen aktiven cyclopropane- und spirocyclopropane-anellierten OligoheterocyclenGensini, Martina 30 January 2003 (has links)
No description available.
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Die Iromycine und das Collinolacton: Synthese mikrobieller Naturstoffe aus Streptomyces sp. / The Iromycins and the Collinolacton: synthesis microbial natural products from Streptomyces sp.Shojaei, Heydar 02 May 2007 (has links)
No description available.
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