1. Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC, Canada V8W 3V6, Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver BC, Canada V6T 1Z1, Crystallography Laboratory, Department of Chemistry, University of Alberta, 11227 Saskatchewan Dr. NW, Edmonton, Alberta, Canada T6G 2G2, and Department of Chemistry, Memorial University, St. John's, Newfoundland, Canada A1B 3X7