1. Department
of Chemistry, Biology and Biotechnology, University of Perugia, via Elce di Sotto 10, I-06100 Perugia, Italy
2. Institute
of Chemical Sciences, Ecole Polytechnique Fédérale, CH-1015 Lausanne, Switzerland
3. Department
of Industrial Chemistry “Toso Montanari”, University of Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy