1. Department of Chemistry, University of the West Indies, Mona, Kingston 7, Jamaica, West Indies, Department of Chemistry, Wilfrid Laurier University, Waterloo, Ontario N2L 3V5, Canada, Department of Chemistry, University of Toronto, Toronto M5S 3H6, Canada, and Kanata Chemical Technologies Inc., 310-101 College Street, MaRS Centre, South Tower, Toronto, Ontario M5G 1L7, Canada