1. Department of Chemistry
and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, 77 Massachusetts
Avenue, Cambridge, Massachusetts 02139, United States
2. Dipartimento di
Chimica Organica e Industriale, Università di Parma, and INSTM, UdR Parma, Parco Area delle Scienze
17A, 43124 Parma, Italy
3. Francis Bitter Magnet
Laboratory and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts
02139, United States