1. Laboratory of Macromolecular and Organic Materials
2. Institute of Materials, Ecole Polytechnique Fédérale de Lausanne
3. 1015 Lausanne
4. Switzerland
5. Institut Charles Sadron
6. CNRS-Université de Strasbourg
7. 67034 Strasbourg
8. France
9. Department of Chemistry
10. University of Fribourg
11. CH-1700 Fribourg