1. Department of Chemistry, University of Rome “La Sapienza”, P.le A. Moro 5, 00185 Rome, Italy
2. Department of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milan, Italy
3. Institute for Complex Systems, National Research Council, P.le A. Moro 5, 00185 Rome, Italy
4. Institute for Organic Synthesis and Photoreactivity, National Research Council, via P. Gobetti 101, 40129 Bologna, Italy
5. Department of Physics, University of Rome “La Sapienza”, P.le A. Moro 5, 00185 Rome, Italy