1. Department of Chemistry and Biochemistry, University of Mississippi, Oxford, Mississippi 38677, United States
2. Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Trieste, Trieste I-34127, Italy
3. CNR-ICCOM & IPCF, Consiglio Nazionale delle Ricerche, Pisa I-56124, Italy
4. Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, United States