Synthesis and studies of new organic semiconductors based on furan moieties coming from biomass

Date du colloque : 08/2010International audienc

Synthèse de nouveaux systèmes conjugués de types Donneur-Accepteur basés sur le motif benzodifurane

Date du colloque : 06/2011</p

Semi-conducteurs organiques obtenus à partir de matières premières dérivées de la biomasse

Date du colloque&nbsp;: 05/2009</p

Towards the development of sustainable π-Conjugated materials: Synthesis of new donor-acceptor systems based on extended benzodifuran derivatives

Date du colloque : 08/2012</p

Synthèse de nouveaux matériaux alternés Donneur-Accepteur conjugués pour l’électronique plastique

Date du colloque : 05/2013</p

See-saw neutrino masses and large mixing angles in the vortex background on a sphere

In the vortex background on a sphere, a single 6-dimensional fermion family gives rise to 3 zero-modes in the 4-dimensional point of view, which may explain the replication of families in the Standard Model. Previously, it had been shown that realistic hierarchical mass and mixing patterns can be reproduced for the quarks and the charged leptons. Here, we show that the addition of a single heavy 6-dimensional field that is gauge singlet, unbound to the vortex, and embedded with a bulk Majorana mass enables to generate 4D Majorana masses for the light neutrinos through the see-saw mechanism. The scheme is very predictive. The hierarchical structure of the fermion zero-modes leads automatically to an inverted pseudo-Dirac mass pattern, and always predicts one maximal angle in the neutrino see-saw matrix. It is possible to obtain a second large mixing angle from either the charged lepton or the neutrino sector, and we demonstrate that this model can fit all observed data in neutrino oscillations experiments. Also, U_{e3} is found to be of the order ~0.1.Comment: 23 pages, 1 figur

Extended benzodifuran – thiophene systems connected with azomethine junctions: Synthesis and electronic properties

The synthesis of extended benzodifuran – thiophene systems connected by azomethine junctions are described. The electronic properties of these systems, studied by UV-Vis spectroscopy and cyclic voltammetry, are discussed in relation with the electron withdrawing groups grafted on the benzodifuran unit and the electron donor ability of the thiophene moieties

Thioglycolate de méthyle comme matière première pour la synthèse de beta-alcoxythiophènes

National audienc