1. Department of Chemistry & Physics, Mount Saint Vincent University, Halifax, Nova Scotia, Canada B3M 2J6
2. Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J3
3. Department of Chemistry, Saint Mary's University, Halifax, Nova Scotia, Canada B3H 3C3
4. Département de chimie, Université Laval, Québec, Québec, Canada G1V 0A6
5. Department of Chemistry, Hunter College, & the PhD Program of the Graduate Center, City University of New York, NY 10065, USA