Université de Fribourg

Aus Pinen abgeleitete Eisencarbonylkomplexe und ihre Anwendung in der Naturstoffsynthese

Huber, Veronika ; Jenny, Titus (Dir.)

Thèse de doctorat : Université de Fribourg, 2000 ; Nr. 1317.

(-)-β-pinene is an important and cheap precursor of natural products because of its frequent natural occurrence in high enantiopurity of about 95%. Ring opening complexation of (—)-β-pinene leads to the so called seco-pinene complex which can be isomerised to a diene or an iso-seco-pinene complex in the presence of a protic or a Lewis acid. In the present work the reactivity of these pinene...

Université de Fribourg

Controlling the supramolecular assembly of perfluorinated polycondensed aromatic hydrocarbons by side chain engineering

Aebischer, Olivier F. ; Jenny, Titus (Dir.) ; Weiss, Antoine (Codir.)

Thèse de doctorat : Université de Fribourg, 2007 ; Nr. 1575.

The possibilities of industry to process and to engineer materials at the nanometer level rapidly increase and products using materials engineered at the nanometer level emerge on the markets. In the long term, it is hardly possible to estimate, from the present point, where the ability to engineer materials on the nano-scale will lead human beings, whether the dream of a molecular nanotechnology...

Université de Fribourg

Development of iron catalysts for hydrogenation and polymerization

Raemy, Manuel ; Jenny, Titus (Dir.) ; Bochet, Christian (Codir.)

Thèse de doctorat : Université de Fribourg, 2003 ; no 1413.

In the scope of this work, a series of new, easy to prepare iron hydrogenation catalysts have been introduced. Different aspects of this new hydrogenation catalysts such as iron source, activation reagent, substrates and efficiency were investigated. A ligand-free catalyst, prepared from an iron(II) chloride suspension activated with diisobutylaluminiumhydride (DIBAH), showed the highest...

Université de Fribourg

Entwicklung neuer homogener Eisenhydrierkatalysatoren mit Diazadien- oder Diazatrienliganden

Sieber, Thomas Peter ; Jenny, Titus (Dir.) ; Süss-Fink, Georg (Codir.)

Thèse de doctorat : Université de Fribourg, 1999 ; Nr. 1279.

A new homogeneous iron hydrogenation catalyst system was developed. This new system allows o hydrogenate mono-, di-, and trisubstituted olefins at low hydrogen pressure. Conjugated diimines contained in 1,4-diazadiene (DAT) or 2,5-diazatriene (DAT) systems were found to be most appropriate ligands for iron in this case. The behaviour of various types of ligands with respect to reactvity and...

Université de Fribourg

New polycondensed aromatic compoundsfor applications in the hydrogen cycle

Fragnière, Nicolas ; Jenny, Titus (Dir.)

Thèse de doctorat : Université de Fribourg, 2011.

This work presents the synthesis of a new perfluorinated sulfonic acid function HBC which car¬ries a sulfonic acid at the end of one perfluorinated side-chain.The aim of the introduction of this sulfonic acid is its ability to form proton channels which could be used as electrolyte in pro¬ton exchange membranes for fuel cells. The channels would be created by the formation of stacks of three...

Université de Fribourg

Synthesis and application of an electronically chiral mimic of CpFe

Allemann, Christophe ; Jenny, Titus (Dir.)

Thèse de doctorat : Université de Fribourg, 2002 ; No 1369.

The field of new optically active and reactive organometallic species is of tremendous interest. Within this area, (-)-(1S)-dicarbonyliodide[μ5-(2,8,8-tri-methylbicyclo[3.2.1]oct-3,6-diene)2-yl] iron (1), called 2-Me-BOD-Fe(CO)2I, emerges as a new stage in the development of chiral cyclopentadienyl-like complexes. Studying the reactivity of 1 has shown that both its non-contiguous μ5-system and...

Université de Fribourg

Synthesis and investigation of new large self-assembled supramolecules as potential electron emitters

Alameddine, Bassam ; Jenny, Titus (Dir.)

Thèse de doctorat : Université de Fribourg, 2004 ; no 1440.

Nanotechnology, a research area that covers many scientific disciplines such as Medicine, Biology, Physics and Chemistry has found a great interest in research institutions and wide applications in industries. This is due to many reasons; from these we note the control down to the molecular level providing thereby a greatest efficiency and an important added value as a reason of the low cost of...

Université de Fribourg

Synthesis of novel alkyl- and perfluoroalkyl-substituted polycondensed aromatic hydrocarbons for molecular electronics

Schindler, Mauro K. ; Jenny, Titus (Dir.)

Thèse de doctorat : Université de Fribourg, 2010.

The demand for electronic devices has exploded in the last few years. They are all around us and we use them everyday; TV, mobile phones, computers, etc. Most people could not imagine living without them. The presence of these devices has increased the consumption of electrical power and other resources such as silicon and petrol derivatives. This increase has itself created a demand for...

Université de Fribourg

Towards [0n] paracyclophanes as templates for the synthesis of nanotubes

Muster, Ludwig ; Jenny, Titus (Dir.) ; Bochet, Christian (Codir.)

Thèse de doctorat : Université de Fribourg, 2007 ; no 1548.

Today, nanotechnology has found a great interest in research areas of different scientific fields. Indeed, nanoparticles and nanodevices possess new and promising properties for a lot of applications. Chemistry is useful in preparation of such nanometer sized systems because she allows a construction atom by atom, also called "bottomup" approach. A rational synthesis of carbon nanotubes was...