1. Università degli Studi di Milano
2. Dipartimento di Chimica
3. 20133 Milano
4. Italy
5. Istituto per lo Studio delle Macromolecole
6. Department of Chemistry
7. University of Zurich
8. CH-8057, Zürich
9. Switzerland
10. Laboratory for Photomolecular Science
11. ISIC
12. École Polytechnique Fédérale de Lausanne
13. CH-1015 Lausanne