[1] Ecole Europeenne Chim Polymeres & Mat, UMR 7515, CNRS, Lab Chim Mol & Spect Avancees LCOSA, F-67087 Strasbourg 02, France
[2] Univ Strasbourg, Ecole Europeenne Chim Polymeres & Mat, Lab Ingn Polymeres Hautes Technol, F-67087 Strasbourg, France
[3] Univ Strasbourg, CNRS, Inst Elect Solide & Syst, F-67037 Strasbourg, France
[4] CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France