1. Dipartimento di Chimica “G. Ciamician”, Università di Bologna, via F. Selmi 2, 40126, Bologna, Italy
2. Department of Chemistry and Biochemistry, Eastern Illinois University, 600 Lincoln Ave., Charleston, IL 61920, USA
3. Department of Chemistry, University of Virginia, McCormick Rd., PO Box 411319, Charlottesville, VA 22904, USA