Université de Fribourg

Proline as a charge stabilizing amino acid in peptide radical cations

Monney, Nicolas P.-A. ; Bally, Thomas ; Giese, Bernd

In: Journal of Physical Organic Chemistry, 2015, vol. 28, no. 5, p. 347–353

Long distance electron transfer in proteins requires relay stations that can be transitorily oxidized or reduced. Although individual prolines cannot assume this function, because of their high ionization energy, it has been shown that polyprolines have the ability to transfer charges. In order to determine the role of the proline in the hole distribution and transport within a PheProPhe...

Université de Fribourg

Radicals in stereoselective synthesis and electron transfer reactions

Bernd, Giese ; Sonja, Eckhardt

In: CHIMIA International Journal for Chemistry, 2013, vol. 67, no. 4, p. 200–203

Université de Fribourg

Regioselective oxidative ring opening of cyclopropyl silyl ethers: a quantum chemical study

Rinderhagen, Heiko ; Mattay, Jochen ; Nussbaum, Rafael ; Bally, Thomas

In: Chemistry, a European Journal, 2010, vol. 16, no. 24, p. 7121–7124

In contrast to the structurally and configurationally stable alkyl- or aryl-substituted cyclopropyl radical cations, cyclopropyl silyl ethers undergo spontaneous ring opening upon oxidation whereby the endocyclic C-C(O-TMS) bond is cleaved with remarkable selectivity. DFT calculations on 1-trimethylsilyloxybicyclo[4.1.0]heptane show that this selectivity arises from the topology of the potential...

Université de Neuchâtel

A Mixed Fullerene-Ferrocene Thermotropic Liquid Crystal: Synthesis, Liquid-Crystalline Properties, Supramolecular Organization and Photoinduced Electron Transfer

Even, Michaël ; Heinrich, Benoît ; Guillon, Daniel ; Guldi, Dirk M. ; Prato, Maurizio ; Deschenaux, Robert

In: Chemistry - A European Journal, 2001, vol. 7, no. 12, p. 2595-2604

Grafting of a ferrocene-containing liquid-crystalline malonate derivative to C60 led to the mixed fullerene-ferrocene material 1 which gave rise to a smectic A phase. Cholesterol was used as liquid-crystalline promoter. X-ray diffraction experiments and volumetric measurements indicated that 1 is organized in double layered structures. The corresponding supramolecular...

Université de Neuchâtel

Synthese neuer Ringerweiterter Porphyrine als Vorläufer Hexagonal Diskotischer Mesophasen

Herzog, Beat Andreas ; Neier, Reinhard (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2008 ; Th. 2057.

Tetrapyrrole nehmen eine wichtige Stellung in vielen Bereichen unseres Alltags ein. Die Bedeutung dieser Stoffklasse ist fundamental für das Leben auf unserer Erde, hier seien das Chlorophyll für die Photosynthese oder das Häm für die Atmung stellvertretend erwähnt. Die Natur hat diese Stoffe über Jahrmillionen optimiert und auf die jeweiligen Anwendungen angepasst. Die natürlichen...