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. Department of Organic and Industrial Chemistry and INSTM, UdR Parma, University of Parma, Parco Area delle Scienze 17/A, I-43100 Parma, Italy
4. AGFA-Gevaert N.V., R&D Materials Chemistry Department, Septestraat 27, 2640 Mortsel, Belgium