1. Department of Chemistry and 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 City University of New York NY 10065 USA
6. Departments of Chemistry and Physics Graduate Center City University of New York NY 10016 USA