1. Department of Chemistry, University of New Brunswick, Fredericton, E3B 6E2, Canada, Department of Chemistry, Dalhousie University, Halifax, B4H 4J3, Canada, Department of Chemistry, University of Jyväskylä, P.O. box 35, 40014, Finland; Department of Chemistry, University of Waterloo, Waterloo, N2L 3G1, Canada, and Department of Chemistry, Memorial University of Newfoundland, St. John's, A1B 3X7, Canada