1. Department of Chemistry and Physics, Nova Southeastern University, Fort Lauderdale, Florida 33314-7796, United States
2. Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
3. Department of Chemistry, School of Arts and Sciences, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
4. Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
5. Center for Integrated Nanotechnologies, Albuquerque, New Mexico 87185-1315, United States
6. Department of Chemistry, Moscow State University, Moscow 117899, Russia
7. Department of Chemistry, University of California, Davis, California 95616, United States