1. Department of Chemistry and Biochemistry Florida State University Tallahassee FL 32309 USA
2. Current address: Department of Chemistry and Department of Computer Science University of Toronto Toronto ON, M5S 3H6 Canada
3. Sorbonne Université CNRS, Institut Parisien de Chimie Moléculaire, UMR 8232 4 place Jussieu 75005 Paris France