1. Dipartimento di Chimica, Università degli Studi di Milano, v. Golgi 19, 20133 Milano, Italy
2. Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA
3. School of Chemistry, Bangor University, Bangor, Gwynedd LL57 2UW, United Kingdom
4. Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str. 7, 60438 Frankfurt/Main, Germany
5. Istituto di Scienze e Tecnologie Molecolari, Consiglio Nazionale delle Richerche, v. Golgi 19, 20133 Milano, Italy