1. Department of Chemistry, University of Hawai‘i at Ma̅noa, 2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
2. Department of Chemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
3. Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Via Cintia, 80126 Napoli, Italy