1. Department of Chemistry and Pharmaceutical Sciences; University of Ferrara; Via Fossato di Mortara 17 44121 Ferrara Italy
2. Laboratory of Photomolecular Science; Institute of Chemical Sciences and Engineering; École Polytechnique Fédérale de Lausanne; Station 6 1015 Lausanne Switzerland
3. Scuola Normale Superiore; 56126 Pisa Italy
4. Department of Chemistry and Industrial Chemistry; University of Pisa; 56126 Pisa Italy
5. Laboratory for Photonics and Interfaces; Institute of Chemical Sciences and Engineering; École Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland