1. Istituto CNR per l’ Energetica e le Interfasi, c.o Stati Uniti 4, 35127 Padova, Italy
2. Istituto CNR di Scienze e Tecnologie Molecolari, via C. Golgi 19, 20133 Milano, Italy
3. Molecular Materials and Nanosystems, Eindhoven University of Technology, P.O. Box 513, NL-5600 MB Eindhoven, The Netherlands
4. Istituto CNR per lo Studio delle Macromolecole, via E. Bassini 15, 20133 Milano, Italy