1. Department of Chemical Sciences, University of Naples Federico II, Via Cinthia, I-80126 Naples, Italy
2. Department of Chemistry and Biology, University of Salerno, Via Giovanni Paolo II, 132, I-84084 Fisciano, Salerno, Italy
3. Department of Chemistry, Energetic Materials Research, Ludwig-Maximilian University, Butenandtstrasse 5−13, D-81377 Münich, Germany