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Résumé:

“Geodesic Polyarenes” belong to a new class of carbon materials intermediate between carbon nanotube and graphene. As a matter of fact these molecules are “bowls shaped” polycyclic aromatic hydrocarbon with curved convex or concave surfaces, composed by a carbon skeleton and “the edge of the bowls” is terminated by hydrogen atoms. Different molecules present different curvatures related to the number and the distribution of five numbered and six membered rings. Like flat PAH geodesic polyarenes form crystalline materials exhibiting different structures and intermolecular interactions. The general aim of our work is to bring a better understanding of these new molecules, particularly focusing on the influence of the molecules curvature and size on their structural organization (for flat PAH, it has been demonstrated that the size and shape of the molecule is influencing the crystalline organization) and on their dynamics. Thus infra-red absorption, neutron inelastic scattering have been performed between 10 and 300K in order to understand the dynamics in these crystalline materials. High pressure Raman and X-ray diffraction have also been performed on these crystalline materials in order detect polymorphism associated to possible molecular reorientation.